On Wed, 13 Nov 2013 12:17:21 +0000 Benjamin ESTRABAUD <be@xxxxxxxxxx> wrote: > Hi, > > I noticed that mdadm --fail will only work if a disk is present and is > writeable. > > mdadm's Manage.c seems to first make sure the drive can be "stat"ed > before proceeding (which will fail if the drive is gone), and then > seemingly try to write "Faulty" to the drive's superblock as well as > notifying MD of the drive failure. > > However, in many cases, a drive must be set faulty because it has gone > offline. MD will do a very good job to set the drive faulty itself, > provided that IOs are running on the array. If no IOs are running on the > array, removing a drive and then trying to set it as failed will not > work. Trying to "-r" the drive will also fail since the drive is not yet > marked as failed, so deemed still in use. > > Looking through the code it seemed to me that MD could be told to fail a > drive even if that drive was no longer present (the /dev/sdX device node > file still is in this case), in the same way as remove works. Would that > be possible? Am I missing something here? Does mdadm /dev/mdXX --fail detached do what you want? NeilBrown
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