> Still yet I have been using PowerPath. Trying to test the > communication to storage (DMX3) using Multipath. > > Here are few details : > OS : Linux AS release 4 (Nahant Update 4) > > kernel : 2.6.9-42.0.8.ELsmp (32 bit) > > device-mappter/ : device-mapper-1.02.07-4.0.RHEL4 > multipath device-mapper-multipath-0.4.5-31.el4_7.1 > > As you know I just started with multipath, so the configuration > I did , it is very basic. > > > Here are few questions I have: > > 1. How to get the device-id like PowerPath in > multipath configuration ? Which id are you referring to? If its the pseudo name the mpathX is what you are looking for. The device itself would be like /dev/mapper/mpathX
> > I am showing here for one LUN which is configured > with PowerPath > > Pseudo name=emcpowera > Symmetrix ID=000190102942 > Logical device ID=1A15 > state=alive; policy=SymmOpt; priority=0; queued-IOs=0 > > ============================================================================== > ---------------- Host --------------- - Stor - -- > I/O Path - -- Stats --- > ### HW Path I/O Paths Interf. > Mode State Q-IOs Errors > > ============================================================================== > 0 qla2xxx sdc FA 7bA > active alive 0 0 > 1 qla2xxx sdg FA 10bA > active alive 0 0 > > > The server I am using, it is booted on SAN on sdc, > the /boot device is on /dev/sdc > > > 2. why i am not getting all paths when executing > 'multipath -ll' ? > > Here is the display in multipath: > > [r...@server ~]# multipath -ll > mpath1 (360060480000190102942533031413131) > [size=101 GB][features="0"][hwhandler="0"] > \_ round-robin 0 [active] > \_ 0:0:0:88 sdb 8:16 [active][ready] > \_ 1:0:0:88 sdf 8:80 [active][ready] > > mpath0 (360060480000190102942533030303830) > [size=2 MB][features="0"][hwhandler="0"] > \_ round-robin 0 [active] > \_ 0:0:0:0 sda 8:0 [active][ready] > \_ 1:0:0:0 sde 8:64 [active][ready] > > mpath3 (360060480000190102942533031413139) > [size=101 GB][features="0"][hwhandler="0"] > \_ round-robin 0 [active] > \_ 0:0:0:101 sdd 8:48 [active][ready] > \_ 1:0:0:101 sdh 8:112 [active][ready] > > In the above multipath display , the paths sdc/ > sdg is not visible on which > the server is booted. > > If i execute 'multipath -v3' , I am getting all > paths though. I honestly don't know why, but you might re-try with the attached multipath.conf. I uncommented 2 unnecessary spots and you were missing a bracket, but I don't know how picky the parser is. > 3. In the multipath display , how can I configure the > logical-device id ? > > In Powermt display ( mentioned in 1) 1A15 logical > device id is using the > paths sdc and sdg. And we do all the work based > on the logical device id. > > In case of shared disk, logical divice id has the main role, > If I need the logical device id in multipath , what > configuration I need to do? > > I tried to use 'alias' in multipath to assign the > logical deive id , but it > seems it did not work ... I think the alias not working might come from the missing bracket as well. If not I'm at a loss for helping you cause I've nothing to test with right now. -greg(See attached file: multipath.conf)
multipath.conf
Description: Binary data
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