Synology DSM 6.1 – Release Notes

Version: 6.1.7-15284-2

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(2018-07-12)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS if you are using the models listed below.
   • XS Series : RS2818RP+, RS3618xs, RS2418RP+, RS2418+, FS1018, DS3018xs, RS818RP+, RS818+, FS3017, FS2017, RS4017xs+, RS3617xs, RS3617RPxs, DS3617xs, RS3617xs+, RS18017xs+, RS2416RP+, RS2416+, RS18016xs+, DS3615xs, RC18015xs+, RS815RP+, RS815+, RS3614xs, RS3614RPxs, RS3614xs+, RS3413xs+, RS10613xs+, DS3612xs, RS3412xs, RS3412RPxs, DS3611xs, RS3411xs, RS3411RPxs
   • Plus Series : DS1618+, DS918+, DS718+, DS218+, DS1817+, DS1517+, DS2415+, DS1815+, DS1515+, DS415+
   • Value Series : DS418play
   • Others : VirtualDSM, DDSM

Fixed Issues

1. Adjusted power saving mechanism to improve PCIe compatibility.
2. Fixed a security vulnerability (Synology-SA-18:36).

Version: 6.1.7-15284-1

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(2018-06-25)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed a security vulnerability regarding Linux kernel (CVE-2018-8897).
2. Fixed multiple security vulnerabilities (Synology-SA-18:33).
3. Fixed a security vulnerability regarding Procps-ng (CVE-2018-1124).
4. Minor bug fixes.

Version: 6.1.7-15284

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(2018-05-23)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. Updated Privacy Statement

Fixed Issues

1. Improve stability of Docker when using Btrfs under low memory configurations.
2. Improved stability of the snapshot replication feature.
3. Enhanced stability of MCS in Windows environments.
4. Fixed an issue where a file’s Last Opened Date may be incorrect when using Spotlight.
5. Fixed an issue where enabling SSD Trim may cause file services failure in a high-availability cluster.
6. Fixed an issue fan where changes to speed settings do not apply immediately in a high-availability cluster.
7. Fixed a security vulnerability regarding Wget (CVE-2018-0494).
8. Fixed a security vulnerability regarding PostgreSQL (CVE-2018-1058).
9. Fixed a security vulnerability regarding Linux kernel (Synology-SA-18:21, CVE-2018-1000199).

Version: 6.1.6-15266-1

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(2018-04-12)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.

Fixed Issues

1. Fixed an issue where Drive might not work properly when the indexing rules have been changed.
2. Fixed an issue where certain functions in Package Center might not work properly on Synology NVR products.

Version: 6.1.6-15266

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(2018-03-27)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed an issue where iSCSI service may stop under Windows cluster environment.
2. Fixed an issue where the history record of Resource Monitor may not be updated.
3. Fixed an issue where Korean files may not be read by HFS+.
4. Fixed a security vulnerability regarding p7zip (CVE-2017-17969).
5. Fixed multiple security vulnerabilities regarding NTP (Synology-SA-18:13).
6. Fixed multiple security vulnerabilities regarding Linux kernel (CVE-2017-15649, CVE-2017-17712).
7. Fixed a security vulnerability regarding isc-dhcp (CVE-2018-5732).
8. Fixed multiple security vulnerabilities regarding Samba (Synology-SA-18:08).
9. Fixed multiple vulnerabilities (Synology-SA-18:14).

Version: 6.1.5-15254-1

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(2018-02-27)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.

Fixed Issues

1. Enhanced system stability.

Version: 6.1.5-15254

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(2018-01-31)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

What’s New in DSM 6.1.5

1. Added support for editing permissions to multiple groups and users to a single folder or file simultaneously in File Station.
2. Added Seagate IronWolf Health Management (IHM) support on DS118, DS218play, DS418j, DS418 and DS218.

Fixed Issues

1. Fixed an issue where the system may make a false alarm about hot spare disks when upgrading SHA.
2. Fixed a domain issue by allowing Synology NAS to join an existing domain with an ASCII password.
3. Enhanced system efficiency in calculating a large number of user and group privilege settings.
4. Enhanced SSD cache reliability.
5. Fixed the issue where setting notifications for low volume capacity is not available on 1-bay models.
6. Fixed an issue where converting a single volume to support multiple volumes may be misidentified as a crashed volume.
7. Fixed an issue where users may not be able to collapse and expand fieldsets on an SSD cache webpage with Safari 11 browser.
8. Fixed a security vulnerability regarding Linux kernel (CVE-2017-16939).
9. Fixed a security vulnerability regarding Samba (Synology-SA-17:72).

Version: 6.1.4-15217-5

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(2017-12-21)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed an issue where the scan results of Security Advisor may not be correct.

Version: 6.1.4-15217-4

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(2017-12-14)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed an issue where Block LUNs cannot be enabled after upgrading to DSM 6.1.4-15217-3.
2. Fixed an issue where Advanced LUNs larger than 2TB cannot be mapped to Targets after upgrading to DSM 6.1.4-15217-3.

Version: 6.1.4-15217-3

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(2017-12-15)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. This update is a repack to fix the iSCSI issues.

(2017-12-13)
Fixed Issues

1. Fixed multiple security vulnerabilities pertaining to OpenSSL (CVE-2017-3735, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738).
2. Enhanced the stability of the Apollo Lake platform BIOS.
3. Fixed an issue with abnormal transfer rates for LUNs when backing up to an external storage device.
4. Fixed an issue where DSM may shutdown incorrectly when iSCSI Block LUN services are overloaded.
5. Improved the error handling mechanism for the SSD cache when volumes crash.
6. Enhanced the stability of the upgrade process for SHA clusters.
7. Enhanced volume expansion process stability after an improper shutdown.
8. Enhanced system efficiency for calculating large numbers of user and group privilege settings.
9. Fixed an issue where Microsoft Office documents may fail to save when Windows 10 Fall Creators Update is installed.

Version: 6.1.4-15217-2

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(2017-11-23)

1. Fixed multiple security vulnerabilities regarding Samba (Synology-SA-17:72 Samba).

Version: 6.1.4-15217-1

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(2017-11-13)

1. Fixed an issue where PPPoE cannot be displayed properly in Control Panel.

Version: 6.1.4-15217

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(2017-11-13)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

What’s New in DSM 6.1.4

1. Adjusted the threshold of remaining storage capacity warning to 10%.
2. Support 12TB IronWolf and IronWolf Pro drives with IHM.
3. Users with ACL permissions set as “administration” can edit shared folders in File Station.

Fixed Issues

1. Enhanced the compatibility of USB on certain models.
2. Enhanced the compatibility of SAS drives on certain models.
3. Fixed an issue where the response of user interface might slow down when using hotspares under certain circumstances.
4. Fixed user interface display issues to enhance the usability of Resource Monitor.
5. Fixed an issue where DSM mobile might not work properly on devices running Android 8.0.
6. Fixed an issue where administrator might not be able to log in DSM after removing clients from trusted client list.
7. Enhanced file system stability by backporting Kernel updates.
8. Enhanced the stability of RAID 5, RAID 6, RAID F1, and SHR.
9. Enhanced the compatibility of Windows AD and NFS protocol.
10. Fixed an issue where RAID Resync might slow down when creating or deleting multiple volumes.
11. Fixed an issue where users might be logged out or shared folders of mounted via AFP might be disconnected when changing permissions.
12. Fixed an issue where the background of login panel might be blurry when accessing DSM on Chrome browser.
13. Fixed an issue where users might not be able to collapse and expand nested sections on DSM webpage when using Safari 11 browser.
14. Fixed search results filters of File Station, AFP and SMB to ensure that users can only find files with read permissions in their search results.
15. Fixed multiple security vulnerabilities regarding Linux kernel (CVE-2017-10661, CVE-2017-10662, CVE-2017-10663).
16. Fixed a security vulnerability regarding Samba (CVE-2017-11103).
17. Fixed multiple security vulnerabilities regarding Wget (CVE-2017-6508, CVE-2017-13089, CVE-2017-13090).
18. Fixed a security vulnerability regarding XSS (CWE-79).
19. Fixed multiple security vulnerabilities regarding poppler library (CVE-2017-2820, CVE-2017-7511, CVE-2017-7515, CVE-2017-9408, CVE-2017-9775).

Version: 6.1.3-15152-8

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(2017-10-18)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed multiple security vulnerabilities regarding WPA/WPA2 protocols for wireless connections (CVE-2017-13077, CVE-2017-13078, CVE-2017-13079, CVE-2017-13080, CVE-2017-13081, CVE-2017-13082, CVE-2017-13084, CVE-2017-13086, CVE-2017-13087, CVE-2017-13088).

Version: 6.1.3-15152-7

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(2017-10-12)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Enhanced system stability on certain models:
   • DS918+
   • DS718+
   • DS218+
   • DS418play
2. Enhanced the stability when adding hard disks to expand RAID.

Version: 6.1.3-15152-6

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(2017-10-03)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed multiple security vulnerabilities regarding DNSmasq (CVE-2017-13704, CVE-2017-14491, CVE-2017-14495, CVE-2017-14496).
2. Fixed multiple security vulnerabilities regarding DHCPv6 Server (CVE-2017-14492, CVE-2017-14493, CVE-2017-14494).

Version: 6.1.3-15152-5

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(2017-09-25)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Enhanced monitor mechanism of drive temperatures.
2. Enhanced compatibility of certain drives.
3. Improved the healing mechanism for possible cache device errors.
4. Enhanced file system stability by backporting Kernel updates.
5. Fixed an issue where DSM might not check updates properly when QuickConnect is enabled.
6. Enhanced the stability of DSM startup.
7. Fixed a security vulnerability regarding Bluetooth dongle (CVE-2017-1000250).
8. Fixed a security vulnerability regarding Linux kernel (CVE-2017-1000251).

Version: 6.1.3-15152-4

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(2017-09-06)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed HDD hibernation issues to enhance HDD compatibility.
2. Enhanced overall stability of iSCSI services.
3. Fixed compatibility issues with VMware environments.
4. Fixed multiple security vulnerabilities regarding Linux Kernel (CVE-2017-10661, CVE-2017-10662, CVE-2017-10663).
5. Enhanced the stability of RAID 5, RAID 6, SHR and RAID F1.

Version: 6.1.3-15152-3

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(2017-08-15)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed a compatibility issue when using USB passthrough in Virtual Machine Manager.
2. Fixed security vulnerabilities regarding Linux kernel (CVE-2017-7533, CVE-2017-8890, CVE-2017-1000364, CVE-2017-1000365, CVE-2017-1000370, CVE-2017-1000371).
3. Enhanced the stability of iSCSI Block-Level LUNs.

Version: 6.1.3-15152-1

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(2017-07-19)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.

Fixed Issues

1. Fixed a security vulnerability regarding Samba (CVE-2017-11103).

Version: 6.1.3-15152

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(2017-07-13)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed an issue where some packages might not be repaired automatically.
2. Fixed an issue where the creation of SSD cache might fail on DS1817.
3. Fixed multiple issues regarding quota configuration for users in the administrators group.
4. Fixed an issue where the trusted domain might not display after the deletion and refresh of domain list.
5. Fixed an issue where a connection timeout might occur upon the access to file service page without any available external IP addresses.
6. Fixed an issue where DSM might fail to establish the network connection after reboot.
7. Fixed a security vulnerability regarding FFmpeg (CVE-2017-9993).
8. Fixed a security vulnerability regarding DSM login page (CVE-2017-9553, CVE-2017-9554).
9. Fixed a security vulnerability regarding Nginx (CVE-2017-7529).

Version: 6.1.2-15132-1

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(2017-07-10)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.

Fixed Issues

1. Fixed an issue where the trusted domain might not display after the deletion and refresh of domain list.
2. Fixed a security vulnerability regarding FFmpeg (CVE-2017-9993).

Version: 6.1.2-15132

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(2017-06-29)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

What’s New in DSM 6.1.2

1. Enhanced the write performance of encrypted shared folders when using the AFP.
2. Added support for DHCP server lease time to be measured in seconds.

Fixed Issues

1. Upgraded Samba to version 4.4.13, and fixed a security vulnerability (CVE-2017-2619).
2. Fixed an issue where some users might experience failure when updating domain data, and enhanced the speed of domain data updates.
3. Fixed an issue where users might experience failure when joining a domain.
4. Fixed an issue where volume creation might fail on some models.
5. Fixed an issue where SSD cache status might not be correctly reported via the SNMP.
6. Fixed an issue where SSD read-write cache might fail to be loaded when upgraded to a larger cache in RAID 1.
7. Enhanced the resource usage rate of passive servers on SHA clusters.
8. Enhanced the stability of the unmounting process for encrypted shared folders.
9. Fixed an issue where the L2TP connection service might not work properly for IPv6 clients.
10. Fixed an issue where MTUs might be incorrect after Bond is established on DSM.
11. Fixed an issue where the IPv6 service might not work properly.
12. Fixed an issue where gateway information might be lost when Bond is removed.
13. Refined the IronWolf Health Management (IHM) thresholds.
14. Fixed issue where some 4TB IronWolf drives were not detected when IronWolf Health Management (IHM ) was enabled.
15. Modified description of drive health status.
16. Fixed an issue where 32-bit models might not be properly repaired or expanded due to volume limits.

Version: 6.1.1-15101-4

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(2017-05-25)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.

Fixed Issues

1. Fixed a security vulnerability regarding samba service (CVE-2017-7494).

Version: 6.1.1-15101-3

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(2017-05-23)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed a security vulnerability regarding Linux kernel (CVE-2017-7308).
2. Enhanced the stability of DSM when establishing a network connection.
3. Fixed an issue where DNS server might fail to add IPv6 subnet.

Version: 6.1.1-15101-2

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(2017-05-09)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

Fixed Issues

1. Fixed a security vulnerability (CVE-2017-7184).
2. Fixed an Ubuntu virtual machine system freeze issue on Virtual Machine Manager.
3. Enhanced the stability of iSCSI service.

Version: 6.1.1-15101-1

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(2017-05-02)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart Synology NAS models supporting SSD cache.

Fixed Issues

1. Fixed an issue where domain users/groups might be displayed incorrectly when a file ACL is checked via Samba.
2. Fixed an issue where users might experience failure or receive no response when updating domain data.
3. Fixed an issue where volumes might not function normally when read-write SSD cache is used with advanced iSCSI LUNs.
4. Fixed an issue where encrypted shared folders cannot be unmounted when connections with Samba clients have been established.
5. Fixed an issue where failure of installation or upgrade might occur in Package Center.

Version: 6.1.1-15101

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(2017-05-02)

Important Note

1. The update is expected to be available for all regions within the next few days, although the time of release in each region may vary slightly.
2. This update will restart your Synology NAS.

What’s New in DSM 6.1.1

1. This update includes all bug fixes as well as security fixes in the previously released updates since DSM 6.1.
2. Added support for scheduled RAID scrubbing.
3. Upgraded Samba to version 4.4.9.

Fixed Issues

1. Fixed an issue where the OTP might be requested repeatedly when users log in a same trusted device with different accounts.
2. Fixed an issue where File Station might not work properly when playing slideshows of photos without thumbnails if opened via Application Portal.
3. Fixed an issue where proxy settings cannot be changed when Let’s Encrypt is in use.
4. Fixed an issue where packages cannot be repurchased after refunds.
5. Fixed an issue where Auto Block might fail to block addresses when the Allow List is set as an IP range.
6. Fixed an issue where the default gateway might not be updated when a DHCP client has not received DNS information.
7. Fixed an issue where firewall rules might not be displayed correctly when users add or remove rules on the same port.
8. Fixed an issue where UPnP rules might fail to work properly on Synology NAS with a single Ethernet port.
9. Fixed an issue where the DSM user interface might fail to be properly displayed when DHCP Server receives invalid DNS addresses.
10. Fixed an issue where L2TP connections might fail to be established in kernel 4.4 when the kernel mode is enabled.
11. Fixed an issue where an L2TP connection might fail to be established when the server address starts with a number.
12. Enhanced the usability and display correctness of the Wake on Lan user interface.
13. Fixed an issue where Synology NAS cannot be properly shut down when a bond has been established between Mellanox ConnectX-3 and Synology E10G17-F2.
14. Fixed an issue where DSM might show the message of volume crash upon reboot when a single-disk SHR volume has been mounted with cache and transformed into a Disk Group.
15. Fixed an incorrect volume display on some models where RAID Groups are supported and SHR has been enabled.
16. Fixed an issue where SHA cannot be created when FS3017 contains over 12 drives.
17. Fixed an issue where the settings of SMB encrypted transmission cannot be properly configured.
18. Fixed a connection error that might occur when the name of an SMB shared folder contains consecutive spaces.
19. Fixed an issue where Key Manager might fail to mount encrypted shared folders automatically on startup.
20. Enhanced the stability of the iSCSI service.
21. Fixed an issue where files cannot be written into encrypted shared folders on ext3 file system.
22. Fixed an issue where Snapshot Replication might fail when compression is enabled for shared folders.
23. Fixed an issue where DSM cannot be shut down properly on Qoriq or 88f6281/88f6282 platforms when JBOD volumes are in use.
24. Enhanced the stability of the upgrade process of SHA clusters.

Version: 6.1-15047-2

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(2017-03-22)

Fixed Issues

1. Fixed an issue where a high-availability cluster might unexpectedly switch over when the active server is busy.
2. Fixed an issue where SHA alternatively displays the message of availability/unavailability due to false alarm.
3. Fixed an issue where DSM cannot be joined into Windows AD domains after upgrading to version 6.1.
4. Fixed an issue where domain users cannot be edited on DSM after enabling Windows AD services.
5. Fixed an issue where LDAP users could fail to access files via the SMB protocol.
6. Fixed the compatibility issue of VMware with some file LUNs created on DSM 6.0 Beta.
7. Fixed an issue where an encrypted shared folder cannot be decrypted when the encryption key is set to maximum length.
8. Enhanced the stability of the iSCSI service.
9. Fixed an issue where Auto Block might fail to block addresses when the Allow List is set as an IP range.
10. Fixed an incorrect volume display on some models where RAID Groups are supported and SHR has been enabled.
11. Fixed an issue where Microsoft Office and Adobe documents cannot be opened on Windows after being accessed on macOS via the AFP protocol.
12. Improved the write performance of fragmented Btrfs volumes.
13. Added Seagate IronWolf Health Management (IHM) support on Broadwell-DE models.
14. Fixed the compatibility issue of WD WD8001FFWX with the DX1215 expansion unit.

Version: 6.1-15047-1

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(2017-02-25)

1. Fixed a security vulnerability with the Auto Block function that could allow remote attackers to bypass the current IP blocking mechanism.

Version: 6.1-15047

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(2017-02-21)

Compatibility and Installation

1. DSM 6.1 can only be installed on Synology products running DSM 6.0. Before starting, please log in to DSM and go to Control Panel > Update & Restore to install the latest DSM.
2. Time Backup and HiDrive Backup will not be supported in DSM 6.1 and above.
3. We can not guarantee the accuracy or completeness of third party packages, which are not developed by Synology.
4. Manual re-indexing is required for all files after upgrading to DSM 6.1. The file indexing service in Control Panel has been moved to the preference settings in Synology Universal Search.
5. Due to infrastructure update, packages will need re-initialization after upgrading to DSM 6.1. The process will occupy a higher CPU usage and can take up to an hour depending on the number of packages installed.
6. Directory Server package must be disabled (stop) in Package Center before the upgrade if the server is running on a High Availability cluster.
7. The DSM Help articles in the following languages have been removed: Brazilian Portuguese, European Portuguese, Norwegian, Turkish, Hungarian, Swedish, Danish. In all the packages, the Help articles in these six languages will also be removed.

What’s New in DSM 6.1 Official

1. Extended Btrfs File System Coverage
   • Btrfs file system is now available on more Synology NAS models. Enjoy the powerful features of the next-generation file system.
   • Applied models:
     • 17-series: RS3617xs+, RS3617xs, RS3617RPxs, DS3617xs
     • 16-series: RS18016xs+, RS2416+, RS2416RP+, DS916+, DS416play, DS716+II, DS716+, DS216+II, DS216+
     • 15-series: RC18015xs+, DS3615xs, DS2415+, DS1815+, DS1515+, RS815+, RS815RP+, DS415+
     • 14-series: RS3614xs+, RS3614xs, RS3614RPxs, RS814RP+, RS814+, RS2414RP+, RS2414+
     • 13-series: RS10613xs+, RS3413xs+, DS1813+, DS1513+, DS713+, DS2413+
     • 12-series: DS3612xs, RS3412xs, RS3412RPxs, RS2212+, RS2212RP+, DS1812+, DS1512+, RS812+, RS812RP+, DS412+
     • 11-series: DS3611xs, RS3411xs, RS3411RPxs,
2. File Self-Healing
   • DSM is now capable of detecting and repairing silent data corruption if your Synology NAS meets the following criteria:
     • Running Btrfs file system
     • Built on RAID 1, RAID 5, RAID 6, RAID 10, RAID F1 or non-1 disk SHR
3. Shared Folder Encryption
   • In addition to encrypting a shared folder as you create it, you can now encrypt an existing shared folder, including the “homes” folder, after its creation.
   • With Key Manager, you can now use a USB storage device as a physical key to mount encrypted shared folders automatically without having to memorize all the encryption keys.
   • Removed the “Mount automatically on startup” function from the edit page of shared folders.
4. Account Protection
   • More effective way to guard against brute-force attack
   • Users can set up the number of failed login attempts from trusted or untrusted devices within the specified time period.
5. Extended RAID F1 Support
   • RAID F1 is now available on more Synology NAS models to take advantage of the new RAID type designed for all flash.
   • Applied models:
     • 17-series: FS3017, RS3617xs+, RS3617xs, RS3617RPxs, DS3617xs
     • 16-series: RS18016xs+
     • 15-series: RC18015xs+, DS3615xs
     • 14-series: RS3614xs+, RS3614xs, RS3614RPxs
     • 13-series: RS10613xs+, RS3413xs+
6. File Services
   • Windows File Services and Mac File Services have been renamed SMB and AFP, respectively.
   • All SMB services (SMB1/2/3) are now running Samba 4.4.
   • Supports Time Machine via SMB3 in Mac OS 10.12 and above.
   • Supports Bonjour service, allowing you to back up data to multiple shared folders via Time Machine.
   • Supports sparse files over the SMB protocol to enhance usage efficiency of file system space and network bandwidth.
   • You can now restore to a previous version from Windows Explorer when mounting your home folder via the SMB protocol.
   • After enabling files fast clone in File Service advanced settings, files can be copied at a faster speed when the source and destination are within the same Btrfs volume.
7. Storage Manager
   • RAID type can now be changed from SHR-1 to SHR-2, providing greater flexibility of storage expansion and better data protection. Note: Depending on your disk configuration, two additional disks may be required when changing your RAID type from SHR-1 to SHR-2. For more information, please refer to DSM Help.
   • Provides more types of disk health status to help you grasp the health info of your disks.
   • You can now migrate a single volume to a disk group and then create multiple volumes while using SHR (more flexible for models built on the 32-bit architecture with a single volume size limit of 16TB) .
8. Resource Monitor
   • IT administrators will receive notifications regarding performance issues of the CPU, memory, disks, or LUNs (available on XS+ and XS models).
   • I/O throughput of each process can now be monitored in Task Manager (available on models with Intel 64-bit processors).
   • Added the service-based view, allowing you to monitor resource usage of each service and application (available on models with Intel 64-bit processors).
9. Service Modularization
   • Some of DSM’s built­-in features have been modularized into packages to ensure better system maintenance and update flexibility.
   • Modularization in DSM 6.1 includes USB Copy, File Station, and File indexing.
10. Package Center
    • Automatically updates incompatible packages after the installation of DSM 6.1 to boost your upgrading experience.
11. Flexible Update Options
    • You can apply important fixes without unnecessary system reboots.
    • In case a reboot is required to complete an update, the system will notify you via Email and in DSM, allowing you the flexibility to reboot at a time of your choice.

Known Issues & Limitations

1. Ended support for Intrusion Prevention since DSM 6.1. This package will be removed from Package Center.