Hi Sean,

> do_read_write: pvfs_bufmap_get() failure (-1)
> do_read_write: pvfs_bufmap_get() failure (-1)
> do_read_write: pvfs_bufmap_get() failure (-1)
> ....
>      Debian sarge , kernel 2.6.16, pvfs2-1.5.1,
> Is it bug?why?

You should perhaps send these questions to the pvfs2-users list instead of
the dev list?

Hmm.. It looks like we should be returning ETIMEDOUT instead of a cryptic
-1 from that function.. I will fix that error code..

But regardless, the error that you are seeing could happen if there is a
lot of I/O activity going on simultaneously (> 5) and one or more of them
is not able to get kernel buffers on time to initiate the I/O and hence
times out.
It could also happen if the I/O activities are stuck somehow waiting to
complete and subsequent I/O's start timing out because of unavailable
buffers...

Could you tell us what workload you were running, your system config, and
any user-visible errors? Were the servers ping'able using pvfs2-ping?
thanks for the reports!
Murali
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