Andreas, Alex, Eric,
In a call today with Cray, we discussed briefly about 4MB IOs on the
DDN 9500. I've heard and seen numbers from one customer (I'm not sure
I should name them, so I will not), that demonstrate that they get
better performance with our patch that coalesces 4MB IOs for the
Lustre VFS client. Nic Henke mentioned a discussion with eeb that
debated the advantages of 4MB IOs wrt LNET.
Can you advise:
- is the 4MB IO scenario specific to the Elan configuration of our
first customer who used DDN 9500s
- what is the drawback of 4MB IOs wrt LNET
- is there a clear verdict for Lustre VFS clients?
- does this even matter for liblustre, for which we're unable to
aggregate IOs?
Thanks,
Bojanic
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