[Ocfs2-users] Recreated FS - getting "no free slots available" message when trying to mount

[Jeff Bachtel]

On Wed, Aug 29, 2007 at 03:34:50PM -0400, Richard Bollinger wrote:
> On 8/29/07, Sunil Mushran <Sunil.Mushran at oracle.com> wrote:
> > heh... that would be one reason for the error. It had
> > me puzzled.
> >
> I'm currently running the latest firmware, but the LUN was initially
> created under an older firmware version and the corruption could have
> been lying in wait.  I've regenerated all of the LUNS and things seem
> OK now... but I'd like to have reason to believe that my luck will be
> better this time before putting a lot of data on it.  Other than
> mkfs.ocfs2 & fsck.ocfs2... any suggestions for disk integrity checks?
> Not performance testing, more random i/o with checksums of some sort.

The device you are using (ACNC JetStor for the peanut gallery) has
volume consistency checks you can run from the web interface (and you
can, for instance, regenerate parity data).

Otherwise, we ended up creating files of various sizes (500m, 1g, 2g,
4g) filled with random data, then running md5sum on the files to
determine if the checksum was static.

Unfortunately for us, updating the firmware did not in fact solve our
existing corruption problem, nor did disabling write caches or other
solutions offered by the vendor. Our volume error counts did not go
down until the volumes were recreating on the disk array itself.

jeff

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-- 
Jeff Bachtel  (root at VPR,TAMU)     http://www.cepheid.org/~jeff
"The sciences, each straining in  [finger jeff at cepheid.org for PGP key]
its own direction, have hitherto harmed us little;" - HPL, TCoC