6.5.3 - High iowait writing to encrypted SSD cache

[shaunsund]

I've noticed high IOWAIT on one of my unraid servers usually >45% sometimes more when writing to the SSD cache drive.

 

It's an older SSD so I wonder if thats a sign of a failing SSD or is the TRIM plugin needed with btrfs and encryption?

unzorg-diagnostics-20180718-2013.zip

[Squid]

The trim plugin should be installed and scheduled appropriately whenever you have an SSD installed

Sent via Tapatalk because my wife thinks I spend too much time on the computer

[shaunsund]

my cache is encrypted, all I get is this in the logs:

Jul 20 12:00:01 unzorg root: /etc/libvirt: 802.3 MiB (841224192 bytes) trimmed
Jul 20 12:00:01 unzorg root: /var/lib/docker: 9.4 GiB (10075443200 bytes) trimmed

If I run fstrim manually I get:

 

~$ sudo /sbin/fstrim -v /mnt/cache
fstrim: /mnt/cache: the discard operation is not supported

Seems like trim isn't doing anything for my SSD.

 

And last night I noticed my server had insane load averages just trying to read from the SSD (sdd). (screenshots)

Had to reboot to recover. Any ideas/suggestions on next steps? I have removed the SSD from the array. Before I add it in again, I want to verify that it is good and can keep up with things.