[dm-devel] user defined device name and table

[Pedro Bandim Faustino]

Stefan Bader wrote:
>
>
> 2007/11/26, Pedro Bandim Faustino <pedro.faustino at fccn.pt 
> <mailto:pedro.faustino at fccn.pt>>:
>
>     Hi All,
>
>     I have a working multipath on root, but some questions still
>     unanswered.
>     I'm hoping you can help me out ;)
>
>     My setup details:
>     Machine: IBM Blade Server HS21 with two Qlogic HBAs each connected
>     to a
>     FC switch with two active ports
>     Storage IBM DS4700 with two controllers
>     OS: Fedora 7
>     DM packages:
>         - device-mapper-1.02.17-7.fc7
>         - device-mapper-libs-1.02.17-7.fc7
>         - device-mapper-multipath-0.4.7-11.fc7
>     uname -r: 2.6.23.1-21.fc7
>
>     At the moment this is what I have:
>
>     Output of multipath -ll:
>     mpath0 () dm-0 IBM,1814      FAStT
>     [size=4.0G][features=0][hwhandler=0]
>     \_ round-robin 0 [prio=4][active]
>     \_ 2:0:0:0 sda 8:0   [active][ready]
>     \_ 2:0:1:0 sdb 8:16  [active][ready]
>     \_ 3:0:0:0 sdc 8:32  [active][ready]
>     \_ 3:0:1:0 sdd 8:48  [active][ready]
>
>     Output of df -k:
>     Filesystem           1K-blocks      Used Available Use% Mounted on
>     /dev/dm-2              3960348   1772124   1983800  48% /
>     /dev/dm-1               101086     17593     78274  19% /boot
>     tmpfs                  1037416         0   1037416   0% /dev/shm
>
>     Contents of /dev/mapper/:
>     crw-------  1 root root  10, 63 2007-11-26 13:58 control
>     brw-rw----  1 root disk 253,  0 2007-11-26 13:58 mpath0
>     brw-rw----  1 root disk 253,  1 2007-11-26 13:58 mpath0p1
>     brw-rw----  1 root disk 253,  2 2007-11-26 13:58 mpath0p2
>
>     But this is what I really would like to have:
>
>     Output of multipath -ll:
>     SRV07_BOOT (3600a0b8000295d64000009304742b4c8) dm-0
>     IBM,1814      FAStT
>     [size=4.0G][features=1 queue_if_no_path][hwhandler=0]
>     \_ round-robin 0 [prio=0][enabled]
>     \_ 2:0:0:0 sda 8:0   [active][ready]
>     \_ 3:0:0:0 sdc 8:32  [active][ready]
>     \_ round-robin 0 [prio=6][active]
>     \_ 2:0:1:0 sdb 8:16  [active][ready]
>     \_ 3:0:1:0 sdd 8:48  [active][ready]
>
>
>     I can modify the table by modifying the init script in the initrd
>     image
>     and then booting with the modified initrd image but I don't know
>     how to
>     change the name from mpath0 to SRV07_BOOT.
>
>
> You should be able to change the name by creating a multipaths section 
> like below
>
> multipaths {
>     multipath {
>         wwid "3600a0b8000295d64000009304742b4c8"
>         alias "SRV07_BOOT"
>     }
> }
>
> If that does not work as expected, you might have to say "no" to the 
> user friendly names option.
Hi Stefan,
I've tried that, but what happens is that once the multipathd starts 
I'll have duplicate multipaths, the one at boot time and this one by 
multipathd, with different names.

>
>     Any help will be very appreciated!!
>
>     Thank you,
>     Pedro Faustino
>
>     --
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>     dm-devel at redhat.com <mailto:dm-devel at redhat.com>
>     https://www.redhat.com/mailman/listinfo/dm-devel
>
>
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