[dm-devel] Device mapper single device display

[phillip.carswell at barclays.com]

Hi,

I'm trying to use dmsetup to query specific devices rather than using `dmsetup ls --tree` and having to use some bash or scripting to pull out the specific device. Example below ;

# dmsetup ls --tree
root_vg-mqm_lv (253:7)
`-mpath4 (253:4)
    |- (65:48)
    |- (8:192)
    |- (8:80)
    `- (65:160)
root_vg-kdump (253:2)
`- (104:2)
root_vg-mqmerr_lv (253:8)
`-mpath4 (253:4)
    |- (65:48)
    |- (8:192)
    |- (8:80)
    `- (65:160)
root_vg-apps (253:5)
|-mpath4 (253:4)
|  |- (65:48)
|  |- (8:192)
|  |- (8:80)
|  `- (65:160)
`- (104:2)
root_vg-var (253:1)
`- (104:2)
root_vg-inf (253:3)
`- (104:2)
root_vg-tws (253:10)
`-mpath4 (253:4)
    |- (65:48)
    |- (8:192)
    |- (8:80)
    `- (65:160)
root_vg-swap (253:6)
|-mpath4 (253:4)
|  |- (65:48)
|  |- (8:192)
|  |- (8:80)
|  `- (65:160)
`- (104:2)
root_vg-root (253:0)
`- (104:2)
root_vg-cdunix (253:9)
`-mpath4 (253:4)
    |- (65:48)
    |- (8:192)
    |- (8:80)
    `- (65:160)


If I only wanted to look at root_vg-mqm_lv I want to just see
root_vg-mqm_lv (253:7)
`-mpath4 (253:4)
    |- (65:48)
    |- (8:192)
    |- (8:80)
    `- (65:160)

I can't seem to find this flag within the command, does this exist ? Or can it be added into future releases? This would make scripting around the command a lot easier and would also make diagnosing where we have devices that are not utilising multipath, as below ;

root_vg-mqm_lv (253:6)
`- (8:192)



Phil Carswell | UNIX L3 | IaaS | Infrastructure Services
Tel 00 44 (0)3301 535 884 | Mobile 00 44 (0)7775 544 375 | Email phillip.carswell at barclays.com
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