What type of writes are these... sequential or random? On 6/12/2011 5:37 PM, fibrer...@gmail.com wrote: > Hello all, > > I am benchmarking OCFS2 in a single node environment to see how its > performance stacks up against other Linux file systems. My hardware is > dual CPU, 6-cores per CPU, 2.4GHz Westmere with 24GB RAM. My system > has 24 HDD's of which 23 are active drives in a md RAID 5 array with > 64K chunk size, and one hot-spare. I have a LVM2 volume created out of > this md array. It is running Linux 2.6.38 kernel. > > I am creating the OCFS2 file system as follows: > > /sbin/mkfs.ocfs2 -N 2 -M local > --fs-features=sparse,refcount,xattr,indexed-dirs,discontig-bg,inline-data > -F /dev/md0/ocfs2max > > I am then mounting it as: > > /bin/mount /volumes/md0/ocfs2max > > I am using fio 1.55 to measure performance. My benchmark script uses > uncached IO in 4K and 4M block sizes. I am running 8 fio jobs and 512 > IO depth. I am using a 20GB file as the test file for this benchmark. > > OCFS2 reads (both at 4M and 4K) are very good...within +-3% of the > other major Linux file systems. However, 4K writes are substantially > lower, about half the speed of other Linux FS's. > > Can you provide some recommendations on how I can improve the write > speed with OCFS2? At the current write rate, the trade-off is too > much, but I really like the other features of OCFS2 so I am hopeful > that some tuning/tweaking will get the performance up where it needs > to be. > > Thank you very much in advance! > > - TG > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users@oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-users
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