[dm-devel] dm-multipath has great throughput but we'd like more!
Bob Gautier
rgautier at redhat.com
Thu May 18 07:05:28 UTC 2006
Yesterday my client was testing of multipath load balancing and failover
on a system running ext3 on a logical volume which comprises about ten
SAN LUNs all reached using multipath in multibus mode over two QL2340
HBAs.
On the one hand, the client is very impressed: running bonnie++
(inspired by Ronan's GFS v VxFS example) we get just over 200Mbyte/s
over the two HBAs, and when we pull a link we get about 120MByte/s.
The throughput and failover response times are better than the client
has ever seen, but we're wondering why we are not seeing higher
throughput per-HBA -- the QL2340 datasheet says it should manage
200Mbyte/s and all switches etc. run at 2GBps.
Any ideas?
Bob Gautier
+44 7921 700996
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