we had a similar problem once. from the blade chassis one of the GBICs in the back of the blade module was bad. but the system didn't mark it as bad and kept trying to use it to send traffic. so, it was loosing packets at an alarming rate. replaced the gbic and i/o speed returned to normal.
On Mon, Feb 3, 2014 at 12:31 PM, Michael Ryder <mryder1...@gmail.com> wrote: > Hello LOPSA > > I very rarely push a request for assistance out to a list like this, > generally subscribing to the self-help model of reading and testing, but I'm > at my wit's end. > > I have four fibre-channel switches arranged in two separate fabrics. All > four are HP Storageworks 8/20q (AQ233A) which are apparently really Qlogic > SB3800-08A-11. I have zoning set to default to Deny-all, and > single-initiator zoning in place. > > Everything on there is running at 4Gb, and we're not pushing the limits of > the performance capabilities of the switches nor the fabric. Each pair of > switches in a fabric is connected by a single ISL. > > Performance is lacking, and I know this because my backups, which ran on > another set of Brocade-based HP switches, could push almost 800Mbps > (basically the limit of the NIC). But now on these QLogics, I can only get, > on average ~350Mbps. > > UNLESS... > > I force a zone change. For my backup proxy servers (Windows 2003 and 2008), > I have it's HBA included in two separate, single-initiator zones (as part of > troubleshooting) to each of the array-controller's ports. If I disable one > of the zones (either one), and then a moment later, toggle them, so that > current zone is disabled in favor of the zone to the other controller's port > zone... the speed jumps up to my maximum of ~805Mbps for the rest of the > backup job. Same controller. Same array. Swapping zones to favor the > OTHER port. > > And then after the backup job completes, performance for the very next > backup job is "reset" back to ~350Mbps. > > I am boggled. It is starting to feel like I have an issue with the backup > proxy server, and that for some reason it's MPIO is on the fritz, but I > don't see errors... the latest firmware and drivers are up-to-date, > including MPIO drivers from HP and Microsoft. > > The only real change was going from the Brocades to the Qlogics, all the > rest of the infrastructure is the same. Does anyone have any idea what > could be causing this problem? > > Did I leave out something important? Let me know! I expect I have, as I'm > trying to hastily type this out as I watch the mounting snow and try to > leave the office. > > Mike Ryder > > _______________________________________________ > Tech mailing list > Tech@lists.lopsa.org > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ > _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
