The maintainer for multipath-tools should be able to give you more information but in my experience, the friendly_names feature of multipath-tools have turned out to be more of a problem.
I believe there is a bug that talks about a locking issue with friendly_names upstream. In face, I have been recommending against friendly_names (of of the bindings file). The plain LUN serial number based access is pretty good and reliable and persistent. Ritesh On Thursday 17 Jun 2010 12:49:00 Vincent McIntyre wrote: > Package: multipath-tools > Version: 0.4.8-14+lenny2 > Severity: normal > > *** Please type your report below this line *** > > Sometimes, multipath-tools does not create all the /dev/mapper/mpathN > devices one is expecting it to create. This seems to occur if there > more than two multipathed devices. > > I have a system with a Promise E-Class 610f storage unit and two > J-Class expansion units, attached in a SAS daisy-chain. > The E-class is attached to a Dell 2950 server via a Cisco FC switch. > There are four FC links, two from each controller on the E-Class. > The FC card is a 4-port LSI/Symbios FC949ES, > pciid is 1000:0646 with subsystem id 1000:1260. > > Each storage unit is configured as one logical disk, containing 16 > physical disks in a RAID-6 raid set. > These are presented to the Dell 2950 as 3 distinct LUNs, > one for each logical disk. > > We started with just the E-Class attached (mpath0). > Then, with the Dell 2950 shut down we added the J-classes. > Neither J-class had a partition label or filesystem on them. > > On boot, all three storage units were detected correctly > (a total of 12 sdX devices because of the multiple paths). > > However only two /dev/mapper/mpathN devices were created: > # ls -l /dev/mapper > total 0 > crw-rw---- 1 root root 10, 59 2010-06-17 11:51 control > brw-rw---- 1 root disk 254, 14 2010-06-17 11:51 install_vg0-data > brw-rw---- 1 root disk 254, 13 2010-06-17 11:51 install_vg0-local > brw-rw---- 1 root disk 254, 10 2010-06-17 11:51 install_vg0-opt > brw-rw---- 1 root disk 254, 12 2010-06-17 11:51 install_vg0-srv > brw-rw---- 1 root disk 254, 11 2010-06-17 11:51 install_vg0-tmp > brw-rw---- 1 root disk 254, 8 2010-06-17 11:51 install_vg0-usr > brw-rw---- 1 root disk 254, 9 2010-06-17 11:51 install_vg0-usr+local > brw-rw---- 1 root disk 254, 6 2010-06-17 11:51 install_vg0-var > brw-rw---- 1 root disk 254, 7 2010-06-17 11:51 install_vg0-var+log > brw-rw---- 1 root disk 254, 5 2010-06-17 11:51 install_vg1-srv+backup > brw-rw---- 1 root disk 254, 4 2010-06-17 11:51 install_vg1-srv+mysql > brw-rw---- 1 root disk 254, 0 2010-06-17 11:51 mpath0 > brw-rw---- 1 root disk 254, 2 2010-06-17 11:51 mpath0-part1 > brw-rw---- 1 root disk 254, 1 2010-06-17 11:51 mpath1 > > Yet /var/lib/multipath/bindings showed the right WWNs for all three units: > > # cat /var/lib/multipath/bindings > # Multipath bindings, Version : 1.0 > # NOTE: this file is automatically maintained by the multipath program. > # You should not need to edit this file in normal circumstances. > # > # Format: > # alias wwid > # > mpath0 222810001550c3cb3 > mpath1 2220e0001558b5168 > mpath2 222de000155468f10 > -- Ritesh Raj Sarraf | http://people.debian.org/~rrs "Necessity is the mother of invention."
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