On Wed, Sep 14 2016, scar wrote: > i currently have four RAID-5 md arrays which i concatenated into one > logical volume (lvm2), essentially creating a RAID-50. each md array > was created with one spare disk. > > instead, i would like to move the four spare disks into one group that > each of the four arrays can have access to when needed. i was wondering > how to safely accomplish this, preferably without unmounting/disrupting > the filesystem. You don't need to move the devices. Just use the spare-group= setting in mdadm.conf to tell mdadm that all arrays should be considered part of the same spare-group. Then "mdadm --monitor" will freely move spares between arrays as needed. > > secondly, i have the checkarray script scheduled via cron to > periodically check each of the four arrays. i noticed in the output of > checkarray that it doesn't list the spare disk(s). so i'm guessing they > are not being checked? i was wondering, then, how i could also check > the spare disks to make sure they are healthy and ready to be used if > needed? mdadm doesn't provide any automatic support for this. You would need to e.g. - remove a spare from an array - test it in some way: e.g. use dd to read every block. - if satisfied, add it back to the array. NeilBrown
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