923+ with 1 ssd Cache

[Enquiries]

I have a warning in my Data on my NAS. SSD cache group 1 is missing, but the datas is still accessable, because only SSD-caches with read only access use the cache groups capacity. We recommend that you remove all SSD caches, that allocate the capacity from this cache group, then create a new cache group. Can you tell me if I should simply remove the ssd cache then replace it back into the NAS to create a new group?
Synology Hybrid Raid(SHR) with data protection for 1 Disk Fault Tolerance.

[ed]

In Storage Manager, remove the SSD cache from the volume. Let DSM finish the removal step before touching the hardware.
After the cache is fully detached, shut the NAS down and reseat or replace the SSD if you want to rule out a loose connection.
Power the NAS back on and create a new cache group from scratch.
Once created, reassign it to the volume.

This clears the warning and rebuilds the cache metadata cleanly. Your SHR array is not affected because SSD cache is optional and does not store user data.