[gpfsug-discuss] verbsRdmaSend yes or no

Damir Krstic damir.krstic at gmail.com
Mon Nov 13 20:49:07 GMT 2017


I am missing out on SC17 this year because of some instability with our 2
ESS storage arrays. We have just recently upgraded our ESS to 5.2 and we
have a question about verbRdmaSend setting.

Per IBM and GPFS guidelines for a large cluster, we have this setting off
on all compute nodes. We were able to turn it off on ESS 1 (IO1 and IO2).

However, IBM was unable to turn it off on ESS 2 (IO3 and IO4).

ESS 1 has following filesystem: projects (1PB)
ESS 2 has following filesystems: home and hpc

All our client nodes have this setting off.

So the question is, should we push through and get it disabled on IO3 and
IO4 so that we are consistent across the environment? I assume the answer
is yes. But I would also like to know what the impact is of leaving it
enabled on IO3 and IO4.

Thank you.
Damir
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