Replacing existing hard disk in K250 server

[Ngoh Chean Siung]

Hi,

The K250 server has 2 x 4GB & 2 x 9GB hard disk. 1 x 4GB + 1 x 9GB is vg00 and 1 x 4GB + 1 x 9GB is vg01.

I want to replace both 4GB hard disk with another 9GB hard disk.

Can I hv the steps that I need to do? Before & after swap the hard disk.

regards.

[RAC_1]

What's there on those disks?

[Darrel Louis]

Hi,

If I understand it correct the VG's are not mirrored?

Can you provide the following information:
- lvlnboot -v
- bdf
- setboot

Read the following Doc. to give you an overview how things work:
http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf


Check the following thread:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=18805

GoodLuck

Darrel

[Ngoh Chean Siung]

Hi,

There is no mirroring among these hard disk. The main application in this server is informix. For informix parts, I need to backup archive level 0 for whole instance. The parts that I not sure is on HP site.

# lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c0t6d0 (10/0.6.0) -- Boot Disk
/dev/dsk/c0t4d0 (10/0.4.0)
Boot: lvol1 on: /dev/dsk/c0t6d0
Root: lvol3 on: /dev/dsk/c0t6d0
Swap: lvol2 on: /dev/dsk/c0t6d0
Dump: lvol2 on: /dev/dsk/c0t6d0, 0

# bdf
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 262144 51710 197410 21% /
/dev/vg00/lvol1 298928 28504 240528 11% /stand
/dev/vg00/lvol7 1089536 740083 328066 69% /var
/dev/vg00/lvol6 1791145 1226966 385064 76% /usr
/dev/vg00/lvol5 286720 261112 25369 91% /tmp
/dev/vg00/sd 43797 13827 25590 35% /sd
/dev/vg00/lvol4 638976 361660 260049 58% /opt
/dev/vg01/ninformx 1201993 520433 561360 48% /ninformx
/dev/vg01/live 398869 106752 252230 30% /live
/dev/vg01/lvol2 1001729 897082 4474 100% /home
/dev/vg01/sdproj 147541 68332 64454 51% /sdproj
/dev/vg01/sdproj2 498645 277553 171227 62% /sdproj2
/dev/vg01/lvol8 151509 12754 123604 9% /loadstat
/dev/vg01/yshcm 307200 252581 51233 83% /yshcm

# setboot
Primary bootpath : 10/0.6.0
Alternate bootpath : 10/12/5.2.0

Autoboot is ON (enabled)
Autosearch is OFF (disabled)

regards.

[JASH_2]

Hi,

I would create an ignite image of your system and a backup to tape of your vg01.
Shut the system down, then remove the 4gb disks, add the 9gb disks and re-ignite the server with the ignite image, creating the new larger volume groups as you go. You are putting 2 new disks in aren't you? If not, you will not be able to share the new disk between the two volume groups, so one of them will be a lot smaller.

Regards,

JASH

[Sivakumar TS]

Hi,

if the disks whcih we are planing to replace is the Root/Boot disk then then the ONLY possiblity it to do a Ignite backup and restore.

if it is data Lvols, the you can take a full backup and change the disks and do vgcfgrestore and data restore.

Regards,

Siva.

[Ngoh Chean Siung]

Hi,

1 x 4GB (/dev/dsk/c0t4d0) + 1 x 9GB (/dev/dsk/c0t6d0) is vg00
1 x 4GB (/dev/dsk/c0t3d0) + 1 x 9GB (/dev/dsk/c0t5d0) is vg01

With above info, can I hv step by step with command (such as ignite backup, vg backup, some LVM commands and etc)

regards.

[Bharat Katkar]

Hi,
For VG00 what i can think is as:

1. DO a ignite backup of your vg00.
# make_tape_recovery -ACv -d
Ensure that backup has be done successfully.

2.# vgreduce vg00

3.# vgextend vg00

Shutdown the server and boot with Ignite Tape and install it in interactive way.

You can then modify Filesystem size as well as per your requirement.


For vg01:
1. Backup all filesystems/LV's that are on (/dev/dsk/c0t3d0) then unmount those filesystems.
2. vgreduce vg01 (/dev/dsk/c0t3d0)
3. Replace your disk with new 9 GB disk.
4. vgextend vg01 (new disk name)
5. Recreate your LV's and file systems on the extended vg01

Please get the correct command syntax using man.

Hope that help.
Regards,

[Darrel Louis]

Hi,

Extra info regarding Bharat's reply:

Read the Ignite admin guide for extra info:
http://docs.hp.com/en/oshpux11i.html#Ignite-UX

After step1:
- Make a fullbackup of the server
- Make a backup of your informix instance (offline or online)
- make a copy of the /etc/lvmconf directory and put it on a different server.

Step2 & 3:
Depends on which Filesystem is mounted on the 4 Gb disk, check with pvdisplay.
If it's a Filesystem(/opt or /usr) that can't be unmounted you can't vgreduce the VG.
If it can't be unmounted you need to halt the server, replace the 4 Gb disk with the 9Gb and then boot from Ignite tape.

GoodLuck

Darrel

[Bharat Katkar]

Thanks darrel for those additions.
I would also like to attach the PV_LV_VG admin guide for you.

Hope that helps.
Regards,

[Bharat Katkar]

Thanks darrel for those additions.
I would also like to attach the PV_LV_VG admin guide for you.

Hope that helps.
Regards,