[Gluster-devel] Write speed problem in single client - single server setup

Anand Avati avati at zresearch.com
Tue Jan 8 09:16:26 UTC 2008

can you post your spec files (http://glusterfs.pastebin.com)? do you have
write-behind on the client spec file?


2008/1/7, Dmitry Unkovsky <emagmon at gmail.com>:
> Hello.
> We are trying to setup a redundant glusterfs storage. But the main
> problem in our case is a write speed, even with single client - single
> server setup. With read speed about 75-80MB/sec, write is at best
> ~30MB/s
> from a single client (even with a server located on a local node
> trough a unix/socket) with
> relatively big files. Background writing on a remote node (which
> happens with afr, for example) gives an additional slowdown. In a real
> life clustered environment with concurrent access things can be a
> little bit different, but the results we experience now do not look
> good, anyway.
> We've tried nearly any combination of performance translators
> options, booster, parallel and sequential writing with /bin/cp, /bin/dd
> with different block size and such.
> A quick, not too deep look at the code was not enough to find a place
> that can cause such drop of write performance comparing to read. Can
> you give a
> hint where to dig further or what could be tweaked in the code to
> improve this situation? This could be our simple mistake or
> or some misunderstanding.
> Also, it would be nice if someone would share his results on read/write
> speed in a simple one client / one server setup (tcp or unix socket)
> with and without performance translators. This wold give an idea of
> what others can expect and where is a point to stop tunning things =)
> Test systems have current version from tla with fuse-2.7.2 patched with
> a little bit adjusted patch for fuse 2.7.0. They are AMD Athlon64
> 4200+/2GB RAM/200GB SATA 7200RPM HDD each, connected with gigabit
> Ethernet. Host itself is capable of sequential reading from HDD at
> ~100MB/s, writing at ~90MB/s. Ftp reads are around ~90MB/s, writes
> ~75MB/s from a remote host.
> P.S.
> Thank you for your project!
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If I traveled to the end of the rainbow
As Dame Fortune did intend,
Murphy would be there to tell me
The pot's at the other end.

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