2011-08-11 04:56 AM
We have performance problems since upgrading to new filer heads running at 4Gb. Our old heads ran at 2Gb.
So, we think the problem is either the QLogic HBAs, or an issue with the c-Class enclosure, or some combination of these. We are going to borrow an Emulex HBA for the c-Class blades to test with – this will tell us if it’s an issue with the QLogic HBAs.
Has anyone else seen a similar issue before? Any ideas on what to test next?
2011-08-15 11:57 PM
Well … there will obviously be some interruption on this port before link is established on new speed. On the total, if you have multiple paths from hosts to filer and use multipathing software, it should be transparent.
2011-09-06 03:02 PM
You might also want to try to upgrade to 6.3.2b Brocade FOS ... 6.2.2 is a bit buggy... Keeping things updated on the ONTap 8.0.x side of things is probably going to be a regular activity as well as it seems to be as buggy as its twin with the 7.3.x tag...
2011-10-25 09:00 AM
We finally found the root cause of this. It is the FC passthrough modules in our HP c-Class enclosure. HP sent us a replacement one and that works like a dream. No more errors logged on the FC switch and performance is great at 4Gb.