linux-kernel - Re: extfs reliability

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Date:	Thu, 29 Jul 2010 18:12:29 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Christoph Hellwig <hch@....de>
CC:	Ted Ts'o <tytso@....edu>, Tejun Heo <tj@...nel.org>,
	Vivek Goyal <vgoyal@...hat.com>, Jan Kara <jack@...e.cz>,
	jaxboe@...ionio.com, James.Bottomley@...e.de,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, linux-kernel@...r.kernel.org,
	kernel-bugs@...ts.ubuntu.com
Subject: Re: extfs reliability


Christoph Hellwig, on 07/29/2010 05:08 PM wrote:
> On Thu, Jul 29, 2010 at 05:00:10PM +0400, Vladislav Bolkhovitin wrote:
>> You can find full kernel logs starting from iSCSI load in the attachments.
>>
>> I already reported such issues some time ago, but my reports were not too much welcomed, so I gave up. Anyway, anybody can easily do my tests at any time. They don't need any special hardware, just 2 Linux boxes: one for iSCSI target and one for iSCSI initiator (the test box itself). But they are generic for other transports as well. You can see there's nothing iSCSI specific in the traces.
> 
> I was only talking about ext3.

Yes, now ext3 is a lot more reliable. The only how I was able to confuse it was:

...
(2197) nb_write: handle 4272 was not open size=65475 ofs=0
(2199) nb_write: handle 4272 was not open size=65475 ofs=65534
(2201) nb_write: handle 4272 was not open size=65475 ofs=131068
(2203) nb_write: handle 4272 was not open size=65475 ofs=196602
(2205) nb_write: handle 4272 was not open size=65475 ofs=262136^C
^C
root@ini:/mnt/dbench-mod# ^C
root@ini:/mnt/dbench-mod# ^C
root@ini:/mnt/dbench-mod# cd
root@ini:~# umount /mnt

<- recover device

root@ini:~# mount -t ext3 -o barrier=1 /dev/sdb /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

Kernel log: "Jul 29 22:05:32 ini kernel: [ 2905.423092] JBD: recovery failed"

root@ini:~# mount -t ext3 -o barrier=1 /dev/sdb /mnt
root@ini:~#

Kernel log:

Jul 29 22:05:54 ini kernel: [ 2927.832893] kjournald starting.  Commit interval 5 seconds
Jul 29 22:05:54 ini kernel: [ 2927.833430] EXT3 FS on sdb, internal journal
Jul 29 22:05:54 ini kernel: [ 2927.833499] EXT3-fs: sdb: 1 orphan inode deleted
Jul 29 22:05:54 ini kernel: [ 2927.833503] EXT3-fs: recovery complete.
Jul 29 22:05:54 ini kernel: [ 2927.838122] EXT3-fs: mounted filesystem with ordered data mode.

But it still remained consistent:

root@ini:~# umount /mnt
root@ini:~# e2fsck -f -y /dev/sdb
e2fsck 1.41.11 (14-Mar-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb: 3504/320000 files (21.1% non-contiguous), 307034/1280000 blocks

Good progress since my original reports for kernels around 2.6.27!

Vlad

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