[Gluster-devel] Dispersed volume: Initial results

Pranith Kumar Karampuri pkarampu at redhat.com
Fri Feb 14 07:01:23 UTC 2014

Looks promising Xavier :-).

----- Original Message -----
> From: "Xavier Hernandez" <xhernandez at datalab.es>
> To: "gluster devel" <gluster-devel at nongnu.org>
> Sent: Thursday, February 13, 2014 5:52:45 PM
> Subject: [Gluster-devel] Dispersed volume: Initial results
> Hi all,
> I've been able to do the first performance comparison of a dispersed
> volume. The translators still have known problems that will be solved as
> soon as possible, but at least they support simple tests. I used a very
> simple configuration and I compared it to a replicated volume with the
> same level of fault tolerance.
> The test environment has been 4 servers based on an Intel Atom D525 1.8
> GHz dual core with 4GB of RAM and 1 TB disk. They are interconnected
> through a dedicated 1Gbit switch (this is the environment that I can
> dispose of regularly for my tests). 3 servers have been used as bricks,
> and the fourth one has been the client.
> The dispersed volume is composed of 3 bricks, with one of them of
> redundancy. This has been compared to an standard replica-2 volume with
> 2 bricks.
> The tests consist on the sequential write of 1GB file using different
> block sizes (all writes aligned to the ida block size). All tests have
> been executed 10 times and the average has been taken. IOPS represents
> the average number of user-side write operations of the current block
> size that can done per second.
> The results are attached in an ods document. This is very preliminary,
> it can change, use it with caution.
> As you will see, the network becomes a bottleneck for both tests when
> the block size if big enough.
> As an additional comparison, an example scenario with 6 bricks of 1 TB
> would have 3 TB of logical space in a distributed-replicated volume, but
> 4 TB in a distributed-dispersed volume, a 33% more space but with the
> same level of fault tolerance.
> Xavi
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