On Mon, 20 Jun 2005 20:46:34 +0200 christophe varoqui <christophe.varoqui@xxxxxxx> wrote > Speaking of optimization, have you witnessed too the ~20% performance > decrease with multi-path PG ? Sorry, but I haven't been paying enough attention to this performance degradation thread. I just tried a simple sequential block file system and raw (4kb) writing and read/writing for single dd(1) thread of 2GB LU with multibus path grouping policy (EMC Symmetrix) with 2 paths and a 100 minio count value and noticed very little drop (5% elapsed time as reported by time(1)) in throughput verses doing the same with the native scsi device path. Five percent is certainly livable. I did not compare with the failover path group policy though.
