On Nov 10, 2013, at 10:34 PM, NeilBrown <neilb@xxxxxxx> wrote: > 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 I think this is very relevant in my case. I typically offload a bulk of data to these drives, frequently using only some parts of it. So, it sounds like having check/scrubbing run on a schedule (how often is a reasonable frequency? every two weeks perhaps?) is a good idea after all. Ivan-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
