From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Buckingham Subject: Re: mdadm: making a spare actie Date: Thu, 19 Jun 2008 23:24:13 +0100 Message-ID: <485ADC8D.2010708@blueyonder.co.uk> References: <485A259B.9040106@blueyonder.co.uk> <18522.18111.182249.694308@notabene.brown> Reply-To: jbuckingham@blueyonder.co.uk Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms000907070802030602090501" Return-path: In-Reply-To: <18522.18111.182249.694308@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org, Jon Buckingham List-Id: linux-raid.ids This is a cryptographically signed message in MIME format. --------------ms000907070802030602090501 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Neil Brown wrote: > On Thursday June 19, jbuckingham@blueyonder.co.uk wrote: >> I have also done >> mdadm /dev/md0 -a /dev/sdb5 >> and this results in a recovery... >> >> nas:~ # cat /proc/mdstat >> Personalities : [raid6] [raid5] [raid4] >> md0 : active raid5 sdb5[4] sda5[0] sdd5[3] sdc5[2] >> 733142016 blocks level 5, 64k chunk, algorithm 2 [4/3] [U_UU] >> [=>...................] recovery = 7.3% (17900780/244380672) finish=174.1min speed=21666K/sec >> >> unused devices: >> >> Which I've been through before, but still ends up as a spare. > > That suggests that it hits some IO error during recovery and aborts. > > Are there any kernel log messages during the time that it is > recovering? > > NeilBrown > > No. After the "add" completed, and a reboot it seems it is still a "spare". Strange. Then from dmesg: device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel@redhat.com md: md0 stopped. md: bind md: bind md: bind md: bind md: kicking non-fresh sdb5 from array! md: unbind md: export_rdev(sdb5) raid5: automatically using best checksumming function: pIII_sse pIII_sse : 5640.000 MB/sec raid5: using function: pIII_sse (5640.000 MB/sec) raid5: device sda5 operational as raid disk 0 raid5: device sdd5 operational as raid disk 3 raid5: device sdc5 operational as raid disk 2 raid5: allocated 4204kB for md0 raid5: raid level 5 set md0 active with 3 out of 4 devices, algorithm 2 RAID5 conf printout: --- rd:4 wd:3 disk 0, o:1, dev:sda5 disk 2, o:1, dev:sdc5 disk 3, o:1, dev:sdd5 I am tempted to rebuild the whole thing now, since I have tried quite a few variations and not solved it. There must be some deeper rooted problem that is causing this issue on the disk. 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