Is there DISCARD support for md/raid0 devices in RHEL 7?
Issue
In some RHEL7 versions the fstrim command on md/raid0 reports following.
cmd: fstrim /mountpoint
fstrim: /mountpoint: the discard operation is not supported
And there are these logs in /var/log/messages file with messages like below.
md/raid0: discard support disabled due to performance uncertainty.
Set raid0.devices_discard_performance=Y to override.
Environment
- Red Hat Enterprise Linux 7
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