On Sun, 10 Nov 2013 13:17:21 -0600 Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote: > Also, I see little/no value in running a scheduled mdadm check on a > RAID1 array. Any problems with RAID1 will be due to one of the disks > beginning to fail in some mode, usually requiring sector relocation. I think scrubbing has value on any RAID with redundancy. The firmware can only relocate a sector if it reads it when it is marginal but not yet completely lost. If a sector is not read for a long time and during that time the media degraded beyond recovery the firmware cannot do anything. But RAID1 can - it can get it from the other device. NeilBrown
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