|
HP OpenVMS Systemsask the wizard |
|
The Question is:
Hello Wizard,
we have 2 alphaserver GS80's using
2GB fibre channel adapters connecting to an enterprise virtual array for our
disk storage. We are runing a split site cluster using FDDI as the intersite
link. The EVA disks are shadowed via the FDDI link. We also have a
quorum node attached (3 node cluster)
Question
--------
When we remove one of the EVA's from the shadow set (Local processing via 2GB
fibre) our application completes in 3hours 40 Minutes. However when we remount
the other shadow set and run the same application it takes around 5 hours 40
minutes. We have anal
yized FDDI and at
no time do we exceed 90% utiliation with shadowing switch on. We have conducted
tests and
can run FDDI consistently at 97%.
We have an FDDI ring HALF DUPLEX - would making FDDI POINT to POINT at 100MB
FULL duplex have a performance improvement. We have tested the FDDI
Adpaters but we are now at a loss as to why there is so much time loss between
local and clustered performance.
Any Ideas?
Regards.
Mark Caccavone
Man Financial IT
The Answer is : Please contact the support center for assistance in determining the particular I/O performance characteristics for the referenced communications configurations here. That said, the OpenVMS Wizard would tend to expect that the relative network utilization levels mentioned here are well beyond the desirable utilitization levels (for the apparently-required performance) and that these levels verge on communications saturation.
|