[Gluster-users] glusterfs performance

Anand Avati avati at zresearch.com
Fri Sep 19 04:25:01 UTC 2008

> Machine 1: 72 MB/sec block write, 72MB/sec block read, 29 MB/sec block
> rewrite.
> Machine 2: 36 MB/sec block write, 72MB/sec block read, 21 MB/sec block
> rewrite.
> gluster-AFR: 22 MB/sec block write, 24 MB/sec block read, 9 MB/sec block
> rewrite.
> gluster-Unify (ALU scheduler): 21 MB/sec, 20 MB/sec block read, 8.8
> MB/sec block rewrite.
> Is this expected performance with gluster for a small number of nodes on
> TCP/IP? Or am I missing some critical piece of configuration? In
> particular, I thought that in an AFR config the client was supposed to
> automatically stripe read requests across available volumes, but the
> read performance doesn't seem to indicate that's happening, considering
> the requests it sends to itself should be able to get close to its
> normal ~70MB/sec rate.

Are you using write-behind in the client volume spec? write-behind affects
write performance significantly. AFR spreads different files to be read from
different subvolumes, and not parts of a file.
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