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 -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
