[Lustre-discuss] llverfs outcome

Andreas Dilger adilger at whamcloud.com
Thu Jan 27 11:06:36 PST 2011

On 2011-01-27, at 04:56, Thomas Roth wrote:
> I have run llverfs (lustre-utils 1.8.4) on an OST partition as "llverfs 
> -w -v /srv/OST0002".
> That went smoothly until all 9759209724 kB were written, terminating with:
> write File name: /srv/OST0002/dir00072/file022
> write complete
> llverfs: writing /srv/OST0002/llverfs.filecount failed :No space left on 
> device
> My question: What should be the result of llverfs? I haven't found any 
> documentation on this tool, so I can just suspect that this was a 
> successful run?

It shouldn't be terminating at this point, but I suspect a bug in llverfs and not in the filesystem.  I _thought_ there was an llverfs(8) man page, but it turns out there is only an old llverfs.txt file.

> (llverdev terminates with 'write complete' also, no errors indicated - 
> good?)

You can restart llverfs with the "-r" option so that it does the read tests to verify the data, and the "-t" option is needed to specify the timestamp used for the writes (so that it can distinguish stale data written from two different tests).  In hindsight, it probably makes sense from a usability POV to allow automatically detecting the timestamp value from the first file read, if unspecified, and then use that for the rest of the test.

Cheers, Andreas
Andreas Dilger 
Principal Engineer
Whamcloud, Inc.

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