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From: NeilBrown <neilb@suse.de>
To: John Drescher <drescherjm@gmail.com>
Cc: lilofile <lilofile@aliyun.com>, stan <stan@hardwarefreak.com>,
	Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: raid5 Unplug the disk
Date: Thu, 5 Feb 2015 16:03:04 +1100	[thread overview]
Message-ID: <20150205160304.1119bb06@notabene.brown> (raw)
In-Reply-To: <CAEhu1-4krpTbF-0mLdgoTKrkdrWo8J2k80BC0t48rv3WkG3UBA@mail.gmail.com>

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On Wed, 28 Jan 2015 11:59:30 -0500 John Drescher <drescherjm@gmail.com> wrote:

> On Wed, Jan 28, 2015 at 1:44 AM, lilofile <lilofile@aliyun.com> 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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      reply	other threads:[~2015-02-05  5:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-28  6:44 raid5 Unplug the disk lilofile
2015-01-28 16:59 ` John Drescher
2015-02-05  5:03   ` NeilBrown [this message]

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