[Ocfs2-users] ocfs2 performance and scaling

[Sabuj Pattanayek]

Hi,

I'm using OCFS2 from 2.6.26 with some patches I made that allow for
the creation of a volume greater than 16TB:

http://oss.oracle.com/pipermail/ocfs2-devel/2008-July/002568.html
http://oss.oracle.com/pipermail/ocfs2-tools-devel/2008-July/000857.html

The ocfs2-tools-devel post has info regarding the block/cluster size
(from the mkfs command) used which will pertain to the following
question: in general, what sort of performance numbers are people
seeing for something like "time dd if=/dev/zero of=testFile bs=4k
count=500000"? I'm getting anywhere from 120MB/s to 165MB/s . The same
command on XFS using the same hardware/LVM setup gives me 300MB/s and
with GFS2 gives 100MB/s. Currently there's only one node in the
cluster but if other nodes are added with similar 4GB FC HBA hardware
will these also achieve ~120-165MB/s write speeds as long as the RAID
hardware isn't being "maxed" out?

Here are some bonnie++ benchmarks:

http://structbio.vanderbilt.edu/~pattans/bonnie-porpoise.html

Also if any devs could look at the patches to see if I missed anything
that might cause OCFS2 to blow up if it reaches for a block offset
greater than 2^32 - 1, would greatly appreciate it (please post in
reply to the posts on the -devel lists). As far as the write testing
is going, it's only at 1.1T of 18T written, i.e. it'll take a day or
two and then I'll have to try some fseek and read calls for large
offsets.

Thanks,
Sabuj Pattanayek