Peter -
Using Gluster the performance of any single file is going to be
limited to the performance of the server on which it exists, or in the
case of a striped volume of the server on which the segment of the file
you are accessing exists. If you were able to start 4 processes,
accessing different parts of the striped file, or lots of different
files in a distribute cluster you would see your performance increase
significantly.
Thanks,
Craig
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Craig Carl
Senior Systems Engineer
Gluster
On 11/26/2010 07:57 AM, Gotwalt, P. wrote:
Hi All,
I am doing some tests with gluster (3.1) and have a problem of not
getting higher throughput than 1 Gb (yes bit!) with 4 storage bricks.
My setup:
4 storage bricks (dualcore, 4GB mem) each with 3 sata 1Tb disks,
connected to a switch with 1 Gb nics. In my tests I only use 1 SATA
disk as a volume, per brick.
1 client (2xquad core, 16 GB mem) with a 10Gb nic to the same switch as
the bricks.
When using striped of distributed configurations, with all 4 bricks
configured to act as a server, the performance will never be higher than
just below 1 Gb! I tested with 4, 8 and 16 parallel bonnie++ runs.
The idea is that parallel bonnie's create enough files to get
distributed over the storage bricks. And all this bonnie's wil deliver
enough throughput to fill up this 10Gb line. I expect the throughput to
be maximum 4Gb because that's the maximum the 4 storage bricks together
can produce.
I also tested the throughput of the network with iperf3 and got:
- 5Gb to a second temporary client on another switch 200 Km from my
site, connected with a 5Gb fiber
- 908-920 Mb to the interfaces of the bricks.
So the network seems ok.
Can someone advise me on why I don't get 4Gb? Or can someone advise me
on a better setup with the equipment I have?
Peter Gotwalt
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