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Hello,
I have 2 physical discs.
I have 4 partitions on the first disk.
I created a volume group "lvmhd" from all of the
partitions and later created logical volumes.
this is the result from the vgdisplay
--- Volume group ---
VG Name lvmhd VG Access read/write VG Status available/resizable VG # 0 MAX LV 256 Cur LV 3 Open LV 3 MAX LV Size 2 TB Max PV 256 Cur PV 4 Act PV 4 VG Size 35.59 GB PE Size 32 MB Total PE 1139 Alloc PE / Size 1131 / 35.34 GB Free PE / Size 8 / 256 MB VG UUID xqamqE-9gSs-Xy3O-2tVQ-wYzy-Cp3u-0Wivbd and those are the logical volumes
/dev/lvmhd/lvm_usr 3.0G
980M 1.8G 35% /usr
/dev/lvmhd/lvm_var 4.9G 65M 4.6G 2% /var /dev/lvmhd/lvm_home 27G 33M 25G 1% /home later I mirrored the first disk to the second disk
with dd if=/dev/hda of=/dev/hdb so if the first disk breaks I can remove it and
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
I am running from the first. But the volume groups are the same and I am afraid
that if I will recreate the logical volumes I'll ruin some thing on the second
disk.
Is there anything I can do about it so I could use
the second disk for backups but still have the same architecture as the primary
disk ?
is there any way to mount those logical volumes
which are mirrors of the primary disk ?
for example I can do
pvdisplay /dev/hdb3 (this is the slave disk which
is the mirror of the primary and its not mounted)
--- Physical volume --- PV Name /dev/hdb3 VG Name lvmhd PV Size 13.67 GB [28676025 secs] / NOT usable 32.19 MB [LVM: 129 KB] PV# 1 PV Status available Allocatable yes (but full) Cur LV 3 PE Size (KByte) 32768 Total PE 436 Free PE 0 Allocated PE 436 PV UUID 5XenPH-2NLb-cmN0-qEBb-QGuJ-zWxv-otMr7i thanks |