ext3 performance with hardware RAID5

Steve Hanson shanson at cruiskeen.com
Wed Jul 14 20:33:46 UTC 2004

Andreas Dilger wrote:
> On Jul 14, 2004  13:56 +0100, Simon Oliver wrote:
>>I would also like to hear any suggestions on how I might further improve
>>file system performance or my test methodology.
> You didn't specify the size of the external journal device.  In our
> testing we found that having a larger journal (internal) made a large
> difference in performance.  I believe that the external journal will
> be the full size of the device (could be wrong of course) so it is
> probably worthwhile to ensure that the external journal is the same
> size as the internal journal (can be specified with "-J size=<mb>" for
> an internal journal, and "mke2fs -s 4096 -O journal_dev /dev/sdb6 <blocks>"
> for the external journal.
Well, actually, he did say - if you read the whole text of 
the email the mke2fs commands are included in the mail -

# external data log
mke2fs -v -s 4096 -O journal_dev /dev/sdb6
mkfs.ext3 -v -j -J device=/dev/sdb6 -O sparse_super -O 
dir_index -R stride=8
/dev/sda1 mount -t ext3 -o data=journal /dev/sda1 /mnt mkdir 
-m 777 /mnt/t
bonnie++ -u nobody:nobody -d /mnt/t -s 4g -m ss1 

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