On Wed, Nov 30 2016, Patrick Dung wrote: > Hello, > > As I know if MD raid is using the newer metadata version, it support > resumable raid rebuild/sync. (that is, if a server is rebooted during > rebuild, it would resume from last position after reboot, instead of > starting from beginning). > > In my recently testing (a few months ago): > I sometimes use the mdadm 'check' action for doing the disk scrubbing > of a MD raid. > After I rebooted the server, the 'check' operation is forgotten and is > not resumable. > > I think resumable 'check' operation is useful as the array size would > become bigger in the future. "check" is resumable. md doesn't record where it is up to though, you need to do that yourself. The "misc/mdcheck" script in the mdadm package makes use of this to support time-limited checking, and to resume from where it left off. You could use the script, or read it and see how it works. NeilBrown
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