On Mon, Oct 11, 2010 at 12:37 PM, Chris Worley <[email protected]> wrote: > While multipathing helps SRP shortcomings in many respects, including > performance, it seems Windows (W2K8R2 Standard) multipathing gets very > confused with >4 drives. > > With 8 drives exported to Windows over SRP, without Multipath > installed/configured, Windows correctly shows 8 drives and 8 > duplicates, and labels the duplicates as offline. > > In configuring multipathing, the "MPIO Properties" dialog in the > "Discover Multi-paths" tab initially shows four drives. Add those and > (w/o rebooting) return to the tab shows two more; add those and return > to the tab shows the last two. With all 8 added, reboot, and "Device > Manager" shows 4 MPIO SRP drives (the four it showed initially in the > "Discover Multi-paths" tab). > > Looking at the MPIO properties of two of those drives shows two paths > each, the other two drives show six paths each (there are only two > paths). When I try to change the "Policy" from the "Round Robin" > default to "Least Queue Depth", the two drives with two paths have no > issue; the two drives with six paths put up an error message that > merely describes the policy, but not any error, and the change won't > take. > > I uninstalled MPIO and reinstalled it, and the same occurred. > Strangely, after the reinstall, the "Least Queue Depth" policy stuck > on drives I had assigned that to before... as if the uninstall didn't > clean the registry as well as it should have. > > Any ideas?
Text output from Windows (you can see the four drives it allows me to use, but the eight drives it sees): C:\Users\Administrator>mpclaim -e "Target H/W Identifier " Bus Type MPIO-ed ALUA Support ------------------------------------------------------------------------- "SCST_BIOfio-71962 " Fibre YES ALUA Not Supported "SCST_BIOfio-71957 " Fibre YES ALUA Not Supported "SCST_BIOfio-41000 " Fibre YES ALUA Not Supported "SCST_BIOfio-40948 " Fibre YES ALUA Not Supported C:\Users\Administrator>mpclaim -h "MSDSM Supported DeviceId" ------------------------------------------------------------------------- "Vendor 8Product 16" "SCST_BIOfio-40948 " "SCST_BIOfio-71962 " "SCST_BIOfio-71957 " "SCST_BIOfio-41000 " "SCST_BIOfio-41001 " "SCST_BIOfio-71964 " "SCST_BIOfio-41002 " "SCST_BIOfio-71965 " _______________________________________________ ofw mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ofw
