On Wed, Dec 10, 2008 at 11:07 AM, Davide Cittaro
<davide.cittaro@xxxxxxxxxxxxxxxxxx> wrote:
> Hi all, I'm migrating from Gentoo to CentOS... I'm experiencing a
> rather low performance in NFS r/w (as client).
> NFS server is solaris (which exports zfs volumes via nfs). The very
> same exports were mounted with the same parameters (auto,nosuid,exec)
> on gentoo and centos server (bot x86_64)... It happens that centos is
> 5-10 times slower either in read and write operations... Ok, I'll try
> to tune rsize and wsize, but does anybody have an hint on this low
> performance?
>
We've seen similar results, but only to specific types of servers.
For example, we have an Onstor/XIV system that is showing 90MB/S
throughput, but an acopia switch in front of it showing much degraded
throughput.
Have you tried these measurements against a native Linux NFS server?
It might be a good data point to find out if this only happens against
Solaris.
However, it could be none of the above, and be degraded ZFS
performance that the NFS protocol is exacerbating. Have you run
network dumps?
--Russell
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