[linux-lvm] JFS or XFS

Austin Gonyou austin at coremetrics.com
Thu Jan 15 22:38:01 UTC 2004

On Thu, 2004-01-15 at 17:33, Greg Freemyer wrote: 
> On Thu, 2004-01-15 at 18:22, neuron wrote:
> > reiserfs, guaranteed personally.  Especially on a mail server.
> I agree, reiserfs was tuned for handling lots of small files.  Sounds
> perfect for a mail server.

Many tests prove this to be true as well. Search on google for what
Greg's saying. Lots of benches out there to see. 


> > Personally I haven't had any problems with XFS though, but I haven't
> used it that much.
> > 
> If you go with XFS, stay away from anything older than 1.3.1.

Not to mention 1.3.x is when the xfslogd and xfsdatad were finally
implemented. I noted this in my prior email regarding tunable log

> The 1.2 and prior releases had this really nice feature that they
> ignored the sync command (and fsync I think).

It wasn't ignored, just not paid attention too as often it should've
been. ;)

> The end result is that with a power outage or kernel lockup you could
> lose lots of work.  I had one failure on a lightly used machine that
> had
> a whole days activities still sitting in the OS disk cache when the
> kernel locked up.

Depending on how often a system might sync()/fsync() this is true. As
well as any FS options you use for mounting XFS volumes regarding
log-buffers, io buffers, etc. 

> This is fixed in 1.3.1, 
> Greg

Yes, much better now. Still, even with JFS or EXT3, as I noted before,
certain AbEnds will cause meta data to be lost. This is more a function
of hardware caching in a non-backed state, such as large cache buffers
of some drives 8MB drive cache, etc.  (i.e. no battery backed up cache)

Austin Gonyou <austin at coremetrics.com>
Coremetrics, Inc.

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