From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Scobie Subject: Re: RAID 1 resync with both members good. Date: Fri, 08 May 2009 07:18:30 +1200 Message-ID: <4A033406.3090009@sauce.co.nz> References: <3D76E016F4A2A749A1EB1A3FD83E22BC02783863@uk-email.terastack.bluearc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <3D76E016F4A2A749A1EB1A3FD83E22BC02783863@uk-email.terastack.bluearc.com> Sender: linux-raid-owner@vger.kernel.org To: Simon Jackson Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids I could be way off the mark as I do not use Debian, but it is my understanding that they install a script which performs regular (weekly? monthly?) checks on md arrays. These will show as resync events. Regards, Richard Simon Jackson wrote: > Could someone help me understand why I am seeing the following > behaviour? > > We use a pair of disks with 3 RAID1 partitions inside an appliance > system. > > During testing we have seen some instances of the RAID devices resyncing > even though both members are marked as good in the output of > /proc/mdstat. > > merc:~# cat /proc/mdstat > Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > [raid4] [raid10] > md2 : active raid1 sda3[0] sdb3[1] > 7823552 blocks [2/2] [UU] > resync=DELAYED > md0 : active raid1 sda5[0] sdb5[1] > 7823552 blocks [2/2] [UU] > md1 : active raid1 sda6[0] sdb6[1] > 55841792 blocks [2/2] [UU] > [=================>...] resync = 88.8% (49606848/55841792) finish=8.4min > speed=12256K/sec > unused devices: > > > Why would a resync occur if both members are marked us good? > > What we usually see when a drive is failed removed and readded is that > the resync marks the new drive as down "_" until the resync completes. > > Firstly why is a resync occurring when both drives are still good in the > raid set? Is this be expected behaviour or an indication of an > underlying problem. > > Thanks for any assistance. > > Using Debian 2.6.26-1 > > Thanks Simon. > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html