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Re: XFS fs size limit?

To: yocum@xxxxxxxx
Subject: Re: XFS fs size limit?
From: Steve Lord <lord@xxxxxxx>
Date: Thu, 02 Aug 2001 12:34:12 -0500
Cc: xfs-list <linux-xfs@xxxxxxxxxxx>
In-reply-to: Message from yocum@fnal.gov of "Thu, 02 Aug 2001 12:13:03 CDT." <3B698A1F.D4FD4736@fnal.gov>
Sender: owner-linux-xfs@xxxxxxxxxxx
> yocum@xxxxxxxx wrote:
> > 
> > Hi all,
> > 
> > I asked this of mkp but he doesn't know off the top of his head: is there a
> > limit to the XFS fs size?  I've tried creating one on just over 1.1TB with
> > no success:
> <snip>
> > FWIW, I'm using 2.4.5 kernel with R1.0.1.
> Seth suggested that I get the TOT cmds and try mkfs.xfs with that.  I did,
> it worked.  Hopefully, I won't run into the problem Jani had a couple weeks
> ago with FS freezes.  I'll let you know if I do.

The freeze was a raid5 specific thing, and the only way out of it at
this kernel revision is to use an external log device with raid5. You
must also make sure to use an inode size larger than the default with
a filesystem this big (mkfs ... -i size=512 ...). Without getting to
technical, this will stop your inode numbers from overflowing 32 bits. 

> Now there's rumors on l-k that the FS size might be limited by the
> signedness of something in the block layer, effectively limiting us to 1TB.

We appear to have people working successfully beyond the 1Tbyte boundary,
the 1Tb limit may be specific to some device drivers which are not as
cleanly coded.

> Oh, joy.
> Thanks,
> Dan
> -- 
> Dan Yocum
> Sloan Digital Sky Survey, Fermilab  630.840.6509
> yocum@xxxxxxxx, http://www.sdss.org
> SDSS.  Mapping the Universe.

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