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    SubjectRe: RAID 5 performance problems
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    That looks like a slow build!
    Mine is about 15 - 20M/sec.

    Another observation I saw, I raided the raw devices instead of the
    partitions; meaning my array is build from hde, hdg, hdi and hdk
    as opposed to hde1, hdg1, hdi1 and hdk1.


    On Thu, 2003-04-03 at 16:10, Jonathan Vardy wrote:
    > you're right, it should be. When I was writing the original mail I had it
    > running in degraded mode so I edited the values that /proc/mdstat gave me to
    > match the array in normal mode. I forgot to make [_UUUU] [UUUUU]. I'm
    > currently rebuilding the array but it's taking some time...
    >
    > md0 : active raid5 hdc1[5] hdk1[4] hdi1[3] hdg1[2] hde1[1]
    > 468872704 blocks level 5, 128k chunk, algorithm 0 [5/4] [_UUUU]
    > [================>....] recovery = 83.1% (97429504/117218176)
    > finish=65.5min speed=5034K/sec
    >
    > ----- Original Message -----
    > From: "Andy Arvai" <arvai@scripps.edu>
    > To: <linux-raid@vger.kernel.org>
    > Cc: <linux-kernel@vger.kernel.org>
    > Sent: Thursday, April 03, 2003 9:49 PM
    > Subject: Re: RAID 5 performance problems
    >
    >
    > >
    > > Shouldn't /proc/mdstat have [UUUUU] instead of [_UUUU]? Perhaps
    > > this is running in degraded mode. Also, you have 'algorithm 0',
    > > whereas my raid5 has 'algorithm 2', which is the left-symmetric
    > > parity algorithm.
    > >
    > > Andy
    > >
    > > > cat /proc/mdstat gives:
    > > >
    > > > Personalities : [raid0] [raid5]
    > > > read_ahead 1024 sectors
    > > > md0 : active raid5 hdk1[4] hdi1[3] hdg1[2] hde1[1] hdc1[0]
    > > > 468872704 blocks level 5, 128k chunk, algorithm 0 [5/5] [_UUUU]
    > > > unused devices: <none>
    > >
    > >
    > >
    > > -
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    > >
    >
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