Re: user defined device name and table

Pedro Bandim Faustino <pedro.faustino@xxxxxxx> · Tue, 27 Nov 2007 09:31:51 +0000

Stefan Bader wrote:

2007/11/26, Pedro Bandim Faustino <pedro.faustino@xxxxxxx 
<mailto:pedro.faustino@xxxxxxx>>:

    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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