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? Thanks in advance, Gianluca -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
