From: Joshua Clark (jclark@hyperkitten.com)
Date: Sat Jan 21 2006 - 09:27:11 EST
Good Morning Sun Managers.
I have a couple of questions I'm hoping someone can help me answer.
I find myself with some hours of downtime due to work on our a/c power. I
was installing a Gig-E adapter in a SunFire V-880 and noticed that the 2GB
dual port FC HBA installed on this system is sitting in PCI slot 6. Slot 6
on the 880 is a 33MHz slot. Slots 7&8 are 33/66Mz slots.
This machine is direct-attached to two 6120 FC arrays via the dual port
FC HBA and running a very i/o intensive Oracle database. The disk arrays
are both arranged in RAID 0+1 configurations and the volumes are managed
by Veritas VxVM/VxFS 3.5.
Question1: Does that fact that the HBA is in a 33MHz slot restrict disk
i/o performance? Would the same HBA in a 66MHz PCI slot offer better
performance?
Question2: If the 66Mz slot would perform better, could I just swap the
card from slot 6 to slot 7 and expect the system to reboot, see the
volumes, and mount the filesystem (the system boots off of the internal
disks of the V880, only Oracle is on the FC array), or, do I need to do
anything with Veritas to notice the new hardware path the the disks?
Question3: Would putting the GigE adapter and the HBA in ports 7 and 8
respectively (the only two 66MHz slots on the 880) create contention since
they are both on the same bus? Would it be wise to put the GigE adapter on
a separate 33MHz bus?
Thanks for reading this, I appreciate any help you can provide.
-Josh-
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