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12-08-2011 02:57 AM
12-08-2011 02:57 AM
mirroring root disk before making the mirror bootable?
Hello
Our VG00 has 2 disks in it, disk1 & disk2.
disk1 has all the os volumes on it, and for some reason, some non os volumes. these non os volumes span across disk1 and disk2.
My question is this:
Can I mirror the OS volumes onto the spare space on disk2, and when external capacity becomes available, move the non os volumes oout of vg00, and only then make disk2 bootable?
I treid to make disk2 bootable before any mirroring, and got this:
root@server at / =>mkboot -l /dev/rdisk/disk230
There appear to be non-boot logical volumes on this device.
Overwriting them could destroy all the data on this device
Should the logical volumes be overwritten [y/n]? n
vgdisplay -v below:
root@server at / =>vgdisplay -v vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 12
Open LV 12
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 4479
VGDA 4
PE Size (Mbytes) 64
Total PE 8940
Alloc PE 7187
Free PE 1753
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 1.0
VG Max Size 4479g
VG Max Extents 71664
--- Logical volumes ---
LV Name /dev/vg00/lvol1
LV Status available/syncd
LV Size (Mbytes) 1792
Current LE 28
Allocated PE 28
Used PV 1
LV Name /dev/vg00/lvol2
LV Status available/syncd
LV Size (Mbytes) 8192
Current LE 128
Allocated PE 128
Used PV 1
LV Name /dev/vg00/lvol3
LV Status available/syncd
LV Size (Mbytes) 2048
Current LE 32
Allocated PE 32
Used PV 1
LV Name /dev/vg00/build
LV Status available/syncd
LV Size (Mbytes) 30720
Current LE 480
Allocated PE 480
Used PV 1
LV Name /dev/vg00/UK-Database-Backup
LV Status available/syncd
LV Size (Mbytes) 204800
Current LE 3200
Allocated PE 3200
Used PV 2
LV Name /dev/vg00/lvol4
LV Status available/syncd
LV Size (Mbytes) 15936
Current LE 249
Allocated PE 249
Used PV 1
LV Name /dev/vg00/lvol5
LV Status available/syncd
LV Size (Mbytes) 9600
Current LE 150
Allocated PE 150
Used PV 1
LV Name /dev/vg00/lvol6
LV Status available/syncd
LV Size (Mbytes) 4096
Current LE 64
Allocated PE 64
Used PV 1
LV Name /dev/vg00/lvol7
LV Status available/syncd
LV Size (Mbytes) 4096
Current LE 64
Allocated PE 64
Used PV 1
LV Name /dev/vg00/lvol8
LV Status available/syncd
LV Size (Mbytes) 8704
Current LE 136
Allocated PE 136
Used PV 1
LV Name /dev/vg00/swap2
LV Status available/syncd
LV Size (Mbytes) 16384
Current LE 256
Allocated PE 256
Used PV 1
LV Name /dev/vg00/IRE-Database-Backup
LV Status available/syncd
LV Size (Mbytes) 153600
Current LE 2400
Allocated PE 2400
Used PV 1
--- Physical volumes ---
PV Name /dev/disk/disk49
PV Status available
Total PE 4470
Free PE 0
Autoswitch On
Proactive Polling On
PV Name /dev/disk/disk230
PV Status available
Total PE 4470
Free PE 1753
Autoswitch On
Proactive Polling On
Regards
Tariq
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12-08-2011 03:10 AM
12-08-2011 03:10 AM
Re: mirroring root disk before making the mirror bootable?
Please do
# lvlnboot -v
If the disk was "pvcreate"'d without the "-B" option, you cannot make this disk bootable without another pvcreate - this will delete the data on the disk.
Hope this helps!
Regards
Torsten.
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12-08-2011 03:14 AM
12-08-2011 03:14 AM
Re: mirroring root disk before making the mirror bootable?
root@server at / =>lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/disk/disk49 -- Boot Disk
/dev/disk/disk230
Boot: lvol1 on: /dev/disk/disk49
Root: lvol3 on: /dev/disk/disk49
Swap: lvol2 on: /dev/disk/disk49
Dump: lvol2 on: /dev/disk/disk49, 0
So what you're syaing is I cannot mirror the LV's in VG00, as when it came making disk2 bootable, I could lose all the data?
I thought instead of pvcreate -B, I could just do a mkboot -l and mkboot -a "hpux -lq" on disk2.
Thanks
Tariq
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12-08-2011 03:23 AM
12-08-2011 03:23 AM
Re: mirroring root disk before making the mirror bootable?
With "-B" it reserves additional space for LIF and BDRA.
Without having this additional space, you cannot populate the LIF (mkboot), hence you cannot make this disk bootable.
Hope this helps!
Regards
Torsten.
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12-08-2011 03:34 AM
12-08-2011 03:34 AM
Re: mirroring root disk before making the mirror bootable?
The layout of a non-bootable disk looks like this (pvcreate without -B):
PVRA
VGRA
DATA
...
a bootable disk (pvcreate -B ...) looks like this
LIF header
PVRA
BDRA
LIF
VGRA
DATA
...
While making the disk bootable, you populate LIF and BDRA by using mkboot and lvlnboot.
If you try this on a non-bootable disk, the system may overwrite the data area (or just give an error - I did never try).
Hope this helps!
Regards
Torsten.
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12-08-2011 11:49 AM - edited 12-08-2011 12:50 PM
12-08-2011 11:49 AM - edited 12-08-2011 12:50 PM
Re: mirroring root disk before making the mirror bootable?
My question is this:
Can I mirror the OS volumes onto the spare space on disk2, and when external capacity becomes available, move the non os volumes oout of vg00, and only then make disk2 bootable?
- You might as well wait until external capacity becomes available
1. Copy all the non-os volumes to it
2. Using "lvremove", remove all the non-os logical volumes on vg00 after successful copy of non-os volumes.
3. Using "pvdisplay -v", verify /dev/disk/disk49 has all the vg00 data and nothing left on /dev/disk/disk230. If not, you can use "pvmove" to accomplish this.
4. Remove /dev/disk/disk230 from vg00 using vgreduce
5. Re-initialize /dev/disk/disk230 the way it was described in the above post.
6. Extend vg00 to /dev/disk/disk230, and start mirroring each logical volume to it.