Monthly Archives: September 2021

You are browsing the site archives by month.

Synology iSCSI/LUN SSD Cache with DSM 7.0

September 28, 2021 2:31 PM / Leave a Comment /

UPDATE: Seems to be gone with ‘Flashcache Version : flashcache-1.0-2021-10-18-20:42’ on 7.0.1. 🙁

With DSM 7.0 Synology removed the feature of accelerating Block-Level LUNs. This is an interesting feature for iSCSI LUNs used for Hypervisors like VMware ESX.

Synology DSM 7.0 Release Notes:

- Creating SSD caches on block-level LUNs is no longer supported. Existing SSD caches for block LUNs will function normally after the update.

However this is valid but you can re-enable acceleration for Block-Level iSCSI LUNs.

Logon to your Synology NAS via SSH and get the root shell via “sudo -i”. Execute the following command to re-enable the cache.

/var/packages/ScsiTarget/target/bin/synoiscsihook --flashcache_enable

This works as long as you’re not rebooting. You can create a task within DSM with trigger at “Boot-Up” to execute this command line to enable the Cache again.

Keep in mind this will probably shred your SSD.

Posted in: ESXi, Synology, VMWare / Tagged: ,