Please don't send html to the mailing list.  The message was held until
I approved it.

On Wed, 2006-12-13 at 02:25 -0500, Will Constable wrote:
> I have a network server running FC5, with a hardware raid 3 card using
> 5 drives, as one large (1.2TB) partition in JFS.  I chose JFS because
> of a recommendation for performance from a MythTV tutorial, but I
> don't really know much about file systems and am suspecting JFS to be
> causing my problems.  I run samba, apache and MythTV on this machine,
> and there is essentially only one problem as far as I know.  
>
> If I write to my server from the network (only tested from windows XP
> pc's using samba), I often get either an error in windows (Delayed
> Write Failed), or windows freezes while writing.  On the server side,
> I generally get kernel messages from JFS that are completely
> meaningless to me, just a bunch of cryptic numbers and function
> calls. 

Could you please send me the cryptic kernel messages?

> After one of these problems, I can't access the directory that was
> being written to, or my prompt freezes.  Rebooting seems to be the
> only fix- jfs does some replaying and then the filesystem is perfect
> again.  This sounds a lot like a cut and dry problem with JFS… except
> that MythTV does quite a lot of high intensity writing to the array
> and never has trouble like this, yet it happens frequently when being
> written to from samba.  

Still sounds like a jfs problem.  samba shouldn't be able to cause jfs
to trap (which is likely if some things hang up afterward).

> First of all, is there any known problem with using JFS with samba?

No.  I'm sure you're running a pretty recent kernel on FC5, but can you
tell me what the kernel level is?

> Aside from that, I sort of figure maybe there is a samba configuration
> option that is to blame.  Possibly something to do with buffering or
> with maximum throughput allowed… I am just guessing, but can anyone
> help?

It could be that something samba is doing is triggering a bug in jfs
that can be avoided, but I'll know more after seeing the kernel error
messages.

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center


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