Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)
From: Michal Soltys
Date: Thu May 29 2008 - 02:37:58 EST
A very nice bit of work, my only questions is if you ever feel motivated
to repeat this test, it would be fun to do it with ext3 (or ext4) using
the stride= parameter. I did limited testing and it really seemed to
help, but nothing remotely as format as your test.
Speaking about which, it would probably be good to adjust a little how
the filesystem is created and mounted (both in xfs and ext3/4 cases).
E.g. lazy-count=1 is still not the default last time I checked mkfs.xfs.
And even ext4.txt from kernel documentation recommends mounting it with
data=writeback,nobh when doing comparison with metadata journaling
filesystems (the same would go for ext3).
Along with different journal sizes, keeping an eye on stripe &
stripe-width, and other settings that might be of interest.
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