How to check root partation is mirrored or not?

[Torsten.]

The modern servers can also use hardware mirrors, so LVM is not aware of this.

Because different controllers are using different commands, you should consider to post an "ioscan -fn" here to clarify.

[fizan]

LV Name /dev/vg01/lvol3
LV Status available/syncd
LV Size (Mbytes) 40960
Current LE 10240
Allocated PE 20480
Used PV 4
---------------------------------------------
so how to find in which 4 pv its logical extents are spread?

[fizan]

# lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c2t1d0s2 (0/1/1/0.1.0) -- Boot Disk
/dev/dsk/c2t0d0s2 (0/1/1/0.0.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c2t1d0s2
/dev/dsk/c2t0d0s2
Root: lvol3 on: /dev/dsk/c2t1d0s2
/dev/dsk/c2t0d0s2
Swap: lvol2 on: /dev/dsk/c2t1d0s2
/dev/dsk/c2t0d0s2
Dump: lvol2 on: /dev/dsk/c2t1d0s2, 0

its mirored, primary is /dev/dsk/c2t1d0s2 ,
secondary mirror is /dev/dsk/c2t0d0s2 ...

[bullz]

Hello Guruz,

Thanks all for ur views.. But i am bit confused :(

Finlay seeing all the above comments i came to know that my root partation is not mirrored :)

/dev/vg00/lvol3 589824 382256 206008 65% /

bash-4.0# lvdisplay -v /dev/vg00/lvol3 | more
--- Logical volumes ---
LV Name /dev/vg00/lvol3
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 576
Current LE 18
Allocated PE 18
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/c2t0d0 18 18

--- Logical extents ---
LE PV1 PE1 Status 1
00000 /dev/dsk/c2t0d0 00138 current
00001 /dev/dsk/c2t0d0 00139 current
00002 /dev/dsk/c2t0d0 00140 current
00003 /dev/dsk/c2t0d0 00141 current
00004 /dev/dsk/c2t0d0 00142 current
00005 /dev/dsk/c2t0d0 00143 current
00006 /dev/dsk/c2t0d0 00144 current
00007 /dev/dsk/c2t0d0 00145 current
00008 /dev/dsk/c2t0d0 00146 current
00009 /dev/dsk/c2t0d0 00147 current
00010 /dev/dsk/c2t0d0 00148 current
00011 /dev/dsk/c2t0d0 00149 current
00012 /dev/dsk/c2t0d0 00150 current
00013 /dev/dsk/c2t0d0 00151 current
00014 /dev/dsk/c2t0d0 00152 current
00015 /dev/dsk/c2t0d0 00153 current
00016 /dev/dsk/c2t0d0 00154 current
00017 /dev/dsk/c2t0d0 00155 current


1) after seeing mirror copies 0, Since vol3 is part of vg00 i need to mirror entire vg00 for root mirroring, if i am not worng.

2) However, i could see disk c2t0d0 is a primary disk, how can i see the other alternative disk for mirroring?

bash-4.0# ioscan -C disk
H/W Path Class Description
=====================================================
0/0/2/0.0.0.0 disk TEAC DV-28E-N
0/1/1/0.0.0 disk HP 146 GMAW3147NC
0/1/1/0.1.0 disk HP 146 GMAW3147NC


3) In case if i found a new disk, how could i do root mirroring?

[Lijeesh N G_1]

Hi,


Finlay seeing all the above comments i came to know that my root partation is not mirrored :)

/dev/vg00/lvol3 589824 382256 206008 65% /

bash-4.0# lvdisplay -v /dev/vg00/lvol3 | more
--- Logical volumes ---
LV Name /dev/vg00/lvol3
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 0 <<<<<===========Its not mirrored
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 576
Current LE 18
Allocated PE 18
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/c2t0d0 18 18 <<<==========Its not mirrored

--- Logical extents ---
LE PV1 PE1 Status 1
00000 /dev/dsk/c2t0d0 00138 current
00001 /dev/dsk/c2t0d0 00139 current



1) after seeing mirror copies 0, Since vol3 is part of vg00 i need to mirror entire vg00 for root mirroring, if i am not worng??
==>If you want to make it as a alternate boot volume, you should mirror entire VG00,otherwise no use for mirroring.\
So you shoul mirror entire volume group.


2) However, i could see disk c2t0d0 is a primary disk, how can i see the other alternative disk for mirroring?

bash-4.0# ioscan -C disk
H/W Path Class Description
=====================================================
0/0/2/0.0.0.0 disk TEAC DV-28E-N
0/1/1/0.0.0 disk HP 146 GMAW3147NC <<<<====This is your primary disk
0/1/1/0.1.0 disk HP 146 GMAW3147NC <<<<====Alternate disk

==>use
#ioscan -fnC disk
and find the disk with hardware path 0/1/1/0.1.0, this is your alternate disk.Ensure that this disk is not used for any other volume group or any application before mirroring.


3) In case if i found a new disk, how could i do root mirroring?
==>With above output, I could tell it is PA-RISC based server, so follow steps for "Mirroring in PA-RISC servers" which I provided above, replace the actuall disk with your alternate disk.

Regards,
LIJEESH N G

[bullz]

Hello... Souds gr8...

I could able to compleate half of this..
When i trying to extend my logical volume, i am geting the below error.

bash-4.0# lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c2t1d0
Usage: lvextend
[-A Autobackup]
{-l LogicalExtentsNumber |
-L LogicalVolumeSize}
LogicalVolumePath [ PhysicalVolumePath... | PhysicalVolumeGroupName... ]
"m": Illegal option.

Any idea?

[bullz]

Additionaly is it wen can do it onlie (or) we have to perform this in Single user mode..

[Lijeesh N G_1]

Hi,

There is no Mirror software installed on your system.

Check the below command output,
#swlist -l product|grep -i mirror

You have to install the product to enable the mirroring.

Regards,
LIJEESH N G

[R.K. #]

Hello Bullz,

For mirroring there is no need to go into Single User Mode.

You need to install mirror disk ux software which you need to BUY from HP.

Regds..

[bullz]

Thanks folks...

Could some one tell me from where i can download this mirror?