Re: btrfs not iSCSI-target safe?

[Tomasz Chmielewski <mangoo@wpkg.org>]

Tomasz Torcz wrote:
> On Wed, Jul 22, 2009 at 10:40:31AM -0400, Chris Mason wrote:
>> On Wed, Jul 22, 2009 at 01:27:06PM +0200, Tomasz Torcz wrote:
>>>   Hi,
>>>
>>> I tried to export file from btrfs volume using iSCSI target.
>>> As soon as some initiator have read it over network, server
>>> oopsed: http://www.kerneloops.org/submitresult.php?number=557979
>>>  Kernel is Fedora's 2.6.29.6-213.fc11.x86_64. I'm aware that
>>> target iSCSI functionality is out-of-tree (I'm using iscsitarget-0.4.17-3),
>>> so it may not be safe. But is there any known incompatibility
>>> between iscsi-target and btrfs?
>> Sorry, I don't know of any problems between btrfs and iscsi.  Is the
>> iscsi target configured to use linux aio?  That could be the problem.
> 
>   I'm not sure, I'm a mere user. This target software seems to read
> files from kernelspace, which as I understand is frowned upon.
>   If you are interested, sourcecode is at http://iscsitarget.sourceforge.net/
> Ooops occured in fileio_make_request(), in iscsitarget-0.4.17/kernel/file-io.c
> file.

Have you tried other target implementations, for example tgt[1] or scst[2]?

 From experience, I have to say iscsitarget has a couple of serious 
instability problems (at least it was the case about a year ago, could 
be that the things improved).

[1] http://stgt.berlios.de
[2] http://scst.sf.net


-- 
Tomasz Chmielewski
http://wpkg.org