On Tuesday 15 November 2011 16:34:20 Gianluca Cecchi wrote: > Hello, > with RH EL 5.7 x86_64 and updates: > # uname -r > 2.6.18-274.7.1.el5 > # rpm -q device-mapper-multipath > device-mapper-multipath-0.4.7-46.el5_7.1 > > I'm on a IBM HS21 blade connected to a DS4700 storage array. > Without doing nothing in multipath.conf but blacklisting the internal > disk, I get this kind of configuration: > # multipath -l > mpath1 (3600a0b80005012440000093e4a55cf33) dm-6 IBM,1814 FAStT > [size=3.4T][features=1 queue_if_no_path][hwhandler=1 rdac][rw] > \_ round-robin 0 [prio=0][active] > \_ 3:0:0:1 sdb 8:16 [active][undef] > \_ 4:0:0:1 sdc 8:32 [active][undef] > \_ round-robin 0 [prio=0][enabled] > \_ 3:0:1:1 sdd 8:48 [active][undef] > \_ 4:0:1:1 sde 8:64 [active][undef] > > Is there any config option I can force to use only one path at a time > in the active controller, instead of two (sdb and sdc in my case) in > round robin as I see in iostat? > > Also, I noticed that output with "-ll" shows "200" as priority of > paths for the active controller, while "-l" shows 0 for both (see > above)... > Is this a bug or expected difference due to command different switch/verbosity? > (I see similar behaviour also with another server connected to a > DS6800 storage array) > # multipath -ll > mpath1 (3600a0b80005012440000093e4a55cf33) dm-6 IBM,1814 FAStT > [size=3.4T][features=1 queue_if_no_path][hwhandler=1 rdac][rw] > \_ round-robin 0 [prio=200][active] > \_ 3:0:0:1 sdb 8:16 [active][ready] > \_ 4:0:0:1 sdc 8:32 [active][ready] > \_ round-robin 0 [prio=0][enabled] > \_ 3:0:1:1 sdd 8:48 [active][ghost] > \_ 4:0:1:1 sde 8:64 [active][ghost] > > I would like to use default multipath instead of LSI provided rdac, found at > http://www.lsi.com/sep/Pages/rdac/ds4000.aspx > version 09.03.0C05.0504 , dated 7/18/2011 with: > New linux kernel versions supported with this release: > - SLES 10-SP3: 2.6.16.60-0.54.5 > - SLES 10-SP4: 2.6.16.60-0.85.1 > - SLES 11.1 : 2.6.32.12-0.7 > - RHEL5-u5 : 2.6.18-194 > - RHEL5-u6 : 2.6.18-238 > - RHEL6 : 2.6.32-71 > > In fact I'm using 2.6.18-274.7.1.el5 that is not listed... > Any known cons in using device-mapper-multipath with IBM,1814? The rdac driver from LSI won't even compile, IIRC. With the dm-multipath driver you have to disable AVT on the DS4700. Otherwise the rdac module won't work with the storage. regards, Johannes -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
