Turning off ALUA on the host and controller would be a good test as well. ALUA is usually something you want to use, however, I've seen it cause performance and failover issues in certain environments.
Cheers, Brian > On Feb 3, 2014, at 8:04 PM, "Robinson, Greg" > <greg.robin...@dsto.defence.gov.au> wrote: > > UNCLASSIFIED > > Hi Mike, > > It sounds like your MPIO is not working correctly for the array that you > have. I suspect that when you activate your zone, the primary path is chosen > and backups fly, and when you re-enable the other zone, backups chose the > redundant path, and go slow. > > I’ve seen this before (not with backups, but with normal access). I forgot > to install multipathing software on a unix box, and so normal traffic would > go down the redundant path. As this path was not the active path, this > resulted in really slow access. > > As a proof of concept, try disabling a HBA, and see if you get the same > result. > > I would double check the compatibility of the MPIO software against your > array, and against the Qlogic switches. It’s rare, but perhaps the qlogic > switches are not supported. > > You may also be able to select which path is the active path in the MPIO > software. > > Greg. > > From: tech-boun...@lists.lopsa.org [mailto:tech-boun...@lists.lopsa.org] On > Behalf Of Michael Ryder > Sent: Tuesday, 4 February 2014 5:01 AM > To: LOPSA Technical Discussions > Subject: [lopsa-tech] Fibre-Channel Performance issue > > 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 > IMPORTANT: This email remains the property of the Department of Defence and > is subject to the jurisdiction of section 70 of the Crimes Act 1914. If you > have received this email in error, you are requested to contact the sender > and delete the email. > > _______________________________________________ > 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/
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