Hi list, we have Lustre 1.8.3 running on a DDN 9900. One LUN (10 discs) formatted with XFS shows 400 MB/s if oppressed with one 'dd' and large block sizes. One LUN formatted an mounted with ldiskfs (the ext3 based that is default in 1.8.3.) shows 110 MB/s. It this the expected behaviour? It looks a bit low compared to XFS.
We think with help from DDN we did everything we can from a hardware perspective. We formatted the LUN with the correct striping and stripe size, DDN adjusted some controller parameters and we even put the file system journal on a RAM disk. The LUN has 16 TB capacity. I formated only 7 for the moment due to the 8 TB limit. This is what I did: mds_nid...@somehwere RAM_DEV=/dev/ram1 dd if=/dev/zero of=$RAM_DEV bs=1M count=1000 mke2fs -O journal_dev -b 4096 $RAM_DEV mkfs.lustre --device-size=$((7*1024*1024*1024)) --ost --fsname=luram --mgsnode=$MDS_NID --mkfsoptions="-E stride=32,stripe-width=256 -b 4096 -j -J device=$RAM_DEV" /dev/disk/by-path/... mount -t ldiskfs /dev/disk/by-path/... /mnt/ost_1 Is there a way to push the bandwidth limit for a single data stream any further? Michael -- Michael Kluge, M.Sc. Technische Universität Dresden Center for Information Services and High Performance Computing (ZIH) D-01062 Dresden Germany Contact: Willersbau, Room A 208 Phone: (+49) 351 463-34217 Fax: (+49) 351 463-37773 e-mail: [email protected] WWW: http://www.tu-dresden.de/zih
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