hp-ux system backup procedure (with Mirror/UX License)

HP-UX HDD Backup SOP

2013/2/8 更新 by Henry
2013/2/21 更新，加入4.1, 4.2

1. Shutdown
2. 拔出一顆硬碟，作為備份硬碟, 代號HDD0。
3. 開機，確保還在主機上的硬碟可正確開機,代號HDD1。
PS.若要確保備份硬碟代號HDD0也可以正常開機運作，待HDD1開機確認後，關機，拔出HDD1，插入HDD0，開機確認系統可正常運作。

4. 執行
#vgexport /dev/vg00
讓lvm重新搜尋現有的PV與更新/etc/lvmtab 設定。
否則無法成功執行下面指令(lvreduce or vgreduce...)
確認vgexport 成功。

If that fails then you should do a vgscan.
1) mv /etc/lvmtab /etc/lvmtab.sav
2) vgscan -a

4.1 Reducing mirror from root vg -- vg00
for i in 1 2 3 4 5 6 7 8 9 10;do lvreduce -m 0 /dev/vg00/lvol$i;done
vgreduce -f vg00
or
vgreduce /dev/vg00 /dev/dsk/c2t1d0

還未插入新硬碟(代號HDD2)時，只抓到一顆硬碟(HDD0)。
server # ioscan -fnC disk
Class     I  H/W Path       Driver  S/W State   H/W Type     Description
=========================================================================
disk      0  0/0/2/0.0.0.0  sdisk   CLAIMED     DEVICE       TEAC    DV-28E-N
                           /dev/dsk/c0t0d0   /dev/rdsk/c0t0d0
disk      1  0/1/1/0.0.0    sdisk   CLAIMED     DEVICE       HP 146 GST3146855LC
                           /dev/dsk/c2t0d0   /dev/rdsk/c2t0d0
                           ^^^^^^^^^^^
                             代號HDD0

5. online插入新硬碟(HDD2)。

6. 執行#ioscan -fnC disk 確認新硬碟(HDD2)有被抓到。

EXAMPLE:

插入新硬碟後，會抓到第二顆HDD (HDD2)。
server # ioscan -fnC disk
Class     I  H/W Path       Driver  S/W State   H/W Type     Description
=========================================================================
disk      0  0/0/2/0.0.0.0  sdisk   CLAIMED     DEVICE       TEAC    DV-28E-N
                           /dev/dsk/c0t0d0   /dev/rdsk/c0t0d0
disk      1  0/1/1/0.0.0    sdisk   CLAIMED     DEVICE       HP 146 GST3146855LC
                           /dev/dsk/c2t0d0   /dev/rdsk/c2t0d0
disk      2  0/1/1/0.1.0    sdisk   CLAIMED     DEVICE       COMPAQ  BF14688577
                           /dev/dsk/c2t2d0   /dev/rdsk/c2t2d0
                          ^^^^^^^^^^^
                                  HDD2

7.  Adding mirroring to the root vg - vg00

7.1. pvcreate -B /dev/rdisk/c2t2d0

* Create the PV on the second disk so that LVM can manage it
* -B makes it a bootable volume

7.2. mkboot /dev/rdsk/c2t2d0

* Installs the boot files on the second disk

7.3. mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c2t2d0

* Creates an autoboot file on the disk, with information on how to boot

7.4. vgextend /dev/vg00 /dev/dsk/c2t2d0

* extends the volume group to include this second disk.

7.5. vgdisplay -v vg00

* To verify that the second disk is now part of the volume group

7.6. lvlnboot -v

* To verify that the system thinks this disk can boot

7.7. lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c2t2d0

* This extends the logical volume to the mirrored disk, effectively creating the mirrored copy.
* This command needs to be run for each logical volume in the volume group
注意:每一個lvol*都要做。

EXAMPLE:

server # lvextend -m 1 /dev/vg00/lvol$i /dev/dsk/c2t1d0;done            
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol1" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol2" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf

7.8 偷懶方式如下：跑回圈一次lvextend全部
for i in 1 2 3 4 5 6 7 8 9 10;do lvextend -m 1 /dev/vg00/lvol$i /dev/dsk/c2t1d0;done

8. done~~