Hi,

  Is there a way to set the IO scheduler on a specific disk?

you can do this using udev rules so it happens to all SSDs:

services.udev.extraRules = ''
 # set deadline scheduler for non-rotating disks
 # according to https://wiki.debian.org/SSDOptimization, deadline is preferred 
over noop
 ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", 
ATTR{queue/scheduler}="deadline"
'';

This may be better than setting it individually.

--
Regards,
Peter
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