>>>>> "Brad" == Brad Knowles <[EMAIL PROTECTED]> writes:
Brad> It sounds like the second RAID-5 bug listed on the page I
Brad> mentioned:
>>> 28 September 1999: We have seen hangs when perform heavy I/O to
>>> RAID-5 plexes. The symptoms are that processes hang waiting on
>>> vrlock and flswai. Use ps lax to display this information.
>>>
>>> Technical explanation: A deadlock arose between code locking
>>> stripes on a RAID-5 plex (vrlock) and code waiting for buffers to
>>> be freed (flswai).
>>>
>>> Status: Being fixed.
Maybe, maybe not. My crashes have a different signature than your
according to Greg.
Brad> I believe that I have seen this bug myself, but in my only
Brad> I have never been impressed with the benchmarking that bonnie
Brad> is capable of. In my experience, rawio is a much better tool,
Brad> because it handles coordinating large numbers of child
Brad> processes, doesn't lose information in communications between
Brad> the parent and the child processes, by-passes all the filesystem
Brad> overhead, etc....
Brad> If you want to do filesystem level benchmarking, I've been
Brad> more impressed by what I've seen out of Postmark.
... well... one of the pros that I have heard for bonnie is that you
get a number that is close to what you can expect with
applications... vs. something like rawio that is isolating one system
for intensive testing. I often use bonnie as a good weathervane of
how fast a "whole system" is with it's disk.
Dave.
--
============================================================================
|David Gilbert, Velocet Communications. | Two things can only be |
|Mail: [EMAIL PROTECTED] | equal if and only if they |
|http://www.velocet.net/~dgilbert | are precisely opposite. |
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