Start with the hardware, specifically the shared disk. See
if the performance of concurrent r/ws from two nodes is slower
than from any one node. You can run hdparm -t concurrently
from the two nodes. Or if you have no data on the disks, use a
destructive variation of the same.
The other thing to look into would be the network. Ensure that
you are using a private gige channel. Higher network latencies
can cause slowdowns especially if the two nodes are ping ponging
control of the same lock resource.
That's as far as I can go with the info provided. If the above
does not help, email with more details.
Federico Renzetti wrote:> Hi all,
> I have 2 RHEL4ES - 2.6.9-42.ELsmp with qla2340 and DS4300 with OCFS
> 1.2.5 installed.
>
> With one node of the cluster everything is alright.
>
> When I mount the same partition on the 2 nodes read/write performances
> slow down.
>
> Does anybody know a suggestion for this?
>
> thx in advance
>
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