Mirror Disk

[augusto cossa]

Good Day all,

Here any one who know the command that can be used to see the mirrored disk.?

Thanks
Augusto

[Andy Monks]

You probably want to start with :-

vgchange, lvdisplay and pvdisplay

[Andy Monks]

You probably want to start with :-

vgdisplay, lvdisplay and pvdisplay

[Andreas Voss · Accepted solution]

Hi,

with lvdisplay you can see if a lvol is mirrored:
lvsdisplay /dev/vg00/lvol1
--- Logical volumes ---
LV Name /dev/vg00/lvol1
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1 <<<< look here <<<<
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 48
Current LE 12
Allocated PE 24
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default

To see where the origs and mirrors are stored use lvdisplay -v.
lvdisplay -v /dev/vg01/lvol1
--- Logical volumes ---
LV Name /dev/vg00/lvol1
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 48
Current LE 12
Allocated PE 24
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default

--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c1t6d0 12 12
/dev/dsk/c1t5d0 12 12

--- Logical extents ---
LE PV1 PE1 Status 1 PV2 PE2 Status 2
0000 /dev/dsk/c1t6d0 0000 current /dev/dsk/c1t5d0 0000 current
0001 /dev/dsk/c1t6d0 0001 current /dev/dsk/c1t5d0 0001 current
0002 /dev/dsk/c1t6d0 0002 current /dev/dsk/c1t5d0 0002 current
0003 /dev/dsk/c1t6d0 0003 current /dev/dsk/c1t5d0 0003 current
0004 /dev/dsk/c1t6d0 0004 current /dev/dsk/c1t5d0 0004 current
0005 /dev/dsk/c1t6d0 0005 current /dev/dsk/c1t5d0 0005 current
0006 /dev/dsk/c1t6d0 0006 current /dev/dsk/c1t5d0 0006 current
0007 /dev/dsk/c1t6d0 0007 current /dev/dsk/c1t5d0 0007 current
0008 /dev/dsk/c1t6d0 0008 current /dev/dsk/c1t5d0 0008 current
0009 /dev/dsk/c1t6d0 0009 current /dev/dsk/c1t5d0 0009 current
0010 /dev/dsk/c1t6d0 0010 current /dev/dsk/c1t5d0 0010 current
0011 /dev/dsk/c1t6d0 0011 current /dev/dsk/c1t5d0 0011 current

As in the above example you can see that data is stored on /dev/dsk/c1t6d0 and the mirrors on /dev/dsk/c1t5d0

For viewing all LVM infos i've put you a script at attachment.

Regards

[augusto cossa]

Andy,

My server is actualy mirrored but to prove to any one without going to the computer room and see the disks, I would like to issue one command which will display the information regarding all disks and saying what disk is mirroring what.

For example:

Suppose I have 3 disk that are mirrored by other 3, so:

disk 01 mirrored by disk 04

Thanks

[James R. Ferguson]

Hi:

# lvdisplay /dev/vg??/lvol?

Among other things this tells you the state of the logical volume -- available/stale or available/syncd, etc. along with the number of mirrors (0,1,2).

# vgdisplay -v /dev/vg??

Including the '-v' option allows you to see the logical volume status such as available/state or available/syncd AND ALSO the physical volume status of the mirrors.

# pvdisplay -v /dev/dsk/c?t?d?

Including the '-v' option allows you to see additional information such as free/used/stale extent status.

# lvlnboot

I'm adding this one since the creation of a mirrored boot disk requires some extra steps. lvlnboot is a quick check to make sure your mirrored root disk is truly bootable.

For a good guide to creating mirror disk, see the System Administration Tasks manual. Of course, read the man pages for the above commands too! Good luck.

...JRF...

[Andreas Voss]

Hi,

try my script with -v option.
This gives a brief of what lvols are stored/mirrored on what disks.

Regards

[박수정]

Hi!

Use lvlnboot, vgdisplay, pvdisplay,
lvdisplay command


1. #lvlnboot -v
2. #vgdisplay -v vg00
3. #lvdisplay -v /dev/vg00/lvol3