From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: RAID6 ext3 problems Date: Mon, 13 Feb 2012 13:28:53 +1100 Message-ID: <20120213132853.2d90a18f@notabene.brown> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/B1o_0cp+zNHCVOrdchjXIOE"; protocol="application/pgp-signature" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mark Knecht Cc: Jeff W , Linux-RAID List-Id: linux-raid.ids --Sig_/B1o_0cp+zNHCVOrdchjXIOE Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Sun, 12 Feb 2012 12:52:25 -0800 Mark Knecht wrote: > On Sun, Feb 12, 2012 at 12:27 PM, Jeff W wrote: > >> > >> So what _actually_ happens when you issue the commands? Please post > >> back the results of > >> > >> cat /proc/mdstat > > > > jeff@Shmee:~$ cat /proc/mdstat > > Personalities : [raid6] [raid5] [raid4] > > md1 : active raid6 sda[0] sdf1[1] sdg1[5] sde[4] sdd1[3] sdc1[2] > > =C2=A0 =C2=A0 =C2=A02441437440 blocks level 6, 64k chunk, algorithm 2 [= 7/6] [UUUUUU_] > > > > unused devices: > > > > > >> > >> and > >> > >> mount /dev/mdWHATEVER /mountpoint > > > > jeff@Shmee:~$ sudo mount /dev/md1 /mnt > > [sudo] password for jeff: > > mount: wrong fs type, bad option, bad superblock on /dev/md1, > > =C2=A0 =C2=A0 =C2=A0 missing codepage or helper program, or other error > > =C2=A0 =C2=A0 =C2=A0 In some cases useful info is found in syslog - try > > =C2=A0 =C2=A0 =C2=A0 dmesg | tail =C2=A0or so > > > > > > jeff@Shmee:~$ dmesg | tail > > [48532.584428] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga > > encoder (output 0) > > [49369.880015] [drm] nouveau 0000:01:00.0: Setting dpms mode 1 on vga > > encoder (output 0) > > [50470.240278] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga > > encoder (output 0) > > [50522.284317] usb 2-6: USB disconnect, address 4 > > [52848.285524] [drm] nouveau 0000:01:00.0: Setting dpms mode 1 on vga > > encoder (output 0) > > [52940.534516] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga > > encoder (output 0) > > [53540.724023] [drm] nouveau 0000:01:00.0: Setting dpms mode 1 on vga > > encoder (output 0) > > [54039.813485] [drm] nouveau 0000:01:00.0: Setting dpms mode 0 on vga > > encoder (output 0) > > [58210.212241] EXT3-fs error (device md1): ext3_check_descriptors: > > Block bitmap for group 6016 not in group (block 277891307)! > > [58210.247230] EXT3-fs: group descriptors corrupted! > > > > Is that more helpful? > > Thanks! > > Jeff. >=20 > I think it will be to others. It's a bit above my pay grade unfortunately. >=20 > Doing a quick Google of >=20 > RAID ext3_check_descriptors >=20 > turns up others having similar issues to yours (I think) with a few > posts that look like solutions, or possible solutions. >=20 > IMPORTANT: My first inclination was to suggest an fsck but one post I > found made it sound like that hurt his RAID so read carefully before > doing anything that might cause more hard. fsck is the only thing I can recommend. Probably use "-n" first so that it only reads and never writes. Then you c= an see how much damage there appears to be before deciding if you want to fix = it (rather than ask for more suggestions). 'sda' must be left over from some other array.. Maybe 'sda1' had the other device from your current array?? I suspect that when you had the problem that caused you to want to move the array to a new machine, something corrupted the filesystem a little - probably not very much. fsck for ext3 is pretty good at fixing things so you'll probably get your data back. NeilBrown --Sig_/B1o_0cp+zNHCVOrdchjXIOE Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBTzh1ZTnsnt1WYoG5AQI5og//duIuyGCRjyihLPQWOwDaWv4KYooKVJEt +lcbveELs1smYSacxYbUmQz8pThx1z9it8VK7pCp2BPfUTc4+YxjCl/Wzb6PnhBD h8GKWoOBCwhY3U+RU5uaKG6W0Goy+AMZgYSaycMd02WfjEJJBh4Y2IZl4pK3FxWV aazXfO4YNOmEqPO52OwGHLbpsY3ncmxJVmNYNqqOPLmbZhhTbYt7RA2mt8k4KbLu lflJ89CLg8ecbgs7Zf8uUAcSKX1Ur146JEGDNZivGBAnb7IsEHmeTLUEqAT30gUs RRvZNF3nKZQRsApVXwfanfkKIx0idUfYPOnYbvkK8BNtySFHdJvnz7z8LOpPCEZ4 B8gs4E0FsIibLs4YiyWGYqklgBquSOVnJKVbdAGldV/y6IgEkMf4DhPYNlhBy0vR rtAVVQrLMiLFzBHHa0fSE3hQ0BEfn+L6BjGJDiJCTqXT8+OAtCluxZ1Yf9Qox6vN Y8YhmvrUQyzYmt/V7vhz+OeUX28WXn+KTw3XvN3wDS06a3WEZiz8CvfNXQ85N65U CJ6QoqkZV6Mt3mixVT6un/2yQbZ72pi6jRQuemRb3hqcXsNdCrb2po/0VoknYYTn FMKMIqqWkCgm0H++bTkbZ1VP49kz6u9Xt1FJPq8jEj64UMMlHA3kNI/fVmfo9KYp 8DaQDujwUng= =W4Dd -----END PGP SIGNATURE----- --Sig_/B1o_0cp+zNHCVOrdchjXIOE--