On Wed, 28 Jan 2015 11:59:30 -0500 John Drescher <drescherjm@xxxxxxxxx> wrote: > On Wed, Jan 28, 2015 at 1:44 AM, lilofile <lilofile@xxxxxxxxxx> wrote: > > kernel linux 3.10, centos > > when I use 5 disk to create raid5,after sync complete, I unplug a disk,and wait a moment, then replug the same disk. > > > > the original 4 disk are still a raid5 which is degraded. > > I find the single disk become a new raid5,but inactive,what the reason? > > stop whatever new array that shows up then use > > mdadm --manage /dev/mymddevice --re-add /dev/disk5 > Also, you probably need a newer version of mdadm. Creating a new inactive raid5 was a bug. If you have udev configured to run "mdadm -I" on newly added devices (which I think most distros do), then adding POLICY action=re-add to /etc/mdadm.conf should cause the device to automatically be added back to the array when you plug it in. NeilBrown
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