Re: ext3 sucks

["Stephen J. Smoogen" <smooge gmail com>]

On 10/24/05, Joshua Baker-LePain <jlb17 duke edu> wrote:
> Well, on my servers with 3ware 7500-8 boards in hardware RAID5 mode it
> does, and I thought the subject line might get a bit of attention.
> Basically, no matter how I tune, I can't get anything even resembling
> decent write speed out of hardware that used to run quite well.  I've
> played with tuning both 'blockdev --setra' as well as
> /sys/block/$DEVICE/queue/nr_requests, and nothing increases ext3 write
> speed over 20MB/s on a single board.  To prove it isn't hardware, I also
> tested using the centosplus kernel and XFS on the exact same array.  XFS
> was able to get over 40MB/s on a single board.  When doing a RAID0 over 2
> boards, ext3 maxed out at 35MB/s while XFS was able to do >100MB/s.  All
> these tests were done using bonnie++ and a filesize >4x the amount of
> system RAM.
>

It might help for others that you listed what version of the kernel
and other items you are using where it breaks down, and what versions
worked with.



--
Stephen J Smoogen.
CSIRT/Linux System Administrator