Hello,

I have 2 physical discs.

I have 4 partitions on the first disk.=20

I created a volume group "lvmhd" from = all of the=20 partitions and later created logical volumes.

this is the result from the = vgdisplay

--- Volume group ---
VG=20 Name           &nb= sp;  =20 lvmhd
VG=20 Access           &= nbsp;=20 read/write
VG=20 Status           &= nbsp;=20 available/resizable
VG=20 #            =      =20 0
MAX=20 LV            = ;   =20 256
Cur=20 LV            = ;   =20 3
Open=20 LV            = ;  =20 3
MAX LV = Size           2=20 TB
Max=20 PV            = ;   =20 256
Cur=20 PV            = ;   =20 4
Act=20 PV            = ;   =20 4
VG=20 Size           &nb= sp;  =20 35.59 GB
PE=20 Size           &nb= sp;  =20 32 MB
Total=20 PE            = ; =20 1139
Alloc PE / Size       1131 / 35.34 = GB
Free PE / Size       8 / 256 = MB
VG=20 UUID           &nb= sp;  =20 xqamqE-9gSs-Xy3O-2tVQ-wYzy-Cp3u-0Wivbd

and those are the logical = volumes

/dev/lvmhd/lvm_usr    = 3.0G =20 980M 1.8G 35% /usr
/dev/lvmhd/lvm_var   =20 4.9G   65M 4.6G   2%=20 /var
/dev/lvmhd/lvm_home    27G   = 33M  =20 25G   1% /home

later I mirrored the first disk to the = second disk=20 with dd if=3D/dev/hda of=3D/dev/hdb so if the first disk breaks I can = remove it and=20 replace it with the second disk and get the server up in = minutes.

Now I want to be able to use the second = disk while=20 I am running from the first. But the volume groups are the same and I am = afraid=20 that if I will recreate the logical volumes I'll ruin some thing on the = second=20 disk.

Is there anything I can do about it so = I could use=20 the second disk for backups but still have the same architecture as the = primary=20 disk ?

is there any way to mount those logical = volumes=20 which are mirrors of the primary disk ?

for example I can do

pvdisplay /dev/hdb3 (this is the slave = disk which=20 is the mirror of the primary and its not mounted)
--- Physical volume = ---
PV=20 Name           &nb= sp;  =20 /dev/hdb3
VG=20 Name           &nb= sp;  =20 lvmhd
PV=20 Size           &nb= sp;  =20 13.67 GB [28676025 secs] / NOT usable 32.19 MB [LVM: 129=20 KB]
PV#          &nb= sp;       =20 1
PV=20 Status           &= nbsp;=20 available
Allocatable        &= nbsp; =20 yes (but full)
Cur=20 LV            = ;   =20 3
PE Size (KByte)       32768
Total=20 PE            = ; =20 436
Free=20 PE            = ;  =20 0
Allocated PE         =20 436
PV=20 UUID           &nb= sp;  =20 5XenPH-2NLb-cmN0-qEBb-QGuJ-zWxv-otMr7i

thanks