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Hi everyone, I am currently working on a project for which I am using:
I created a ZFS raidZ1 on each node (5 disks + 1) and used GlusterFS in raid5 mode between the 3 nodes. Unfortunately, with (very) big files, I experience a quite low read-performance, compared to write-perf (write=700MB/s while read=320 MB/s). Do you know tuning/optimization parameters which could help me get better read-performance ?
Here's more information on the configuration: ZFS raidz1 on each node: # zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT tank 4,06T 10,5M 4,06T - 0% 0% 1.00x ONLINE - # zpool status pool: tank state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 sda ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 sdd ONLINE 0 0 0 sde ONLINE 0 0 0 sdf ONLINE 0 0 0 errors: No known data errors The command used to create the volume: # zpool create -f tank raidz sda sdb sdc sdd sde sdf When running IOR on each node, I get about write perf = 460 MB/s and read perf = 430 MB/s (writing 1024 GiB with zfer_size=16MiB).
GlusterFS raid5 through TCP (IPoIB) between the 3 nodes: # gluster volume create raid55 disperse 3 redundancy 1 sm01.opa:/tank/ec_point sm02.opa:/tank/ec_point sm03.opa:/tank/ec_point There is a big difference between the read-performance on each ZFS node and with Gluster. Thanks in advance :) Yann
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