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
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
