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6.5.3 - High iowait writing to encrypted SSD cache


shaunsund

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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)

1915852158_ScreenShot2018-07-19at9_34_30PM.thumb.png.22ee0f3a4fd2c4c530fe8a2411e38587.png

535729574_ScreenShot2018-07-19at9_35_48PM.thumb.png.46b8499acd817012e8f80ecd84997b1a.png

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.

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