topic Replace old disk with new disk online in Operating System - HP-UX

Replace old disk with new disk online

unix55 — Mon, 19 Dec 2011 16:14:45 GMT

Hi,

I need to replace our below disk on on this volume group /dev/vg03/lvol1

disk      7 64000/0xfa00/0x6    esdisk CLAIMED     DEVICE       online DGC     VRAID
                      /dev/disk/disk7   /dev/rdisk/disk7
disk     14 64000/0xfa00/0x8    esdisk CLAIMED     DEVICE       online DGC     VRAID
                      /dev/disk/disk14   /dev/rdisk/disk14
disk     15 64000/0xfa00/0x9    esdisk CLAIMED     DEVICE       online DGC     VRAID
                      /dev/disk/disk15   /dev/rdisk/disk15
disk     16 64000/0xfa00/0xa    esdisk CLAIMED     DEVICE       online DGC     VRAID
                      /dev/disk/disk16   /dev/rdisk/disk16
disk     29 64000/0xfa00/0xb    esdisk CLAIMED     DEVICE       online DGC     RAID 5
                      /dev/disk/disk29   /dev/rdisk/disk29
disk     31 64000/0xfa00/0xc    esdisk CLAIMED     DEVICE       online DGC     RAID 5
                      /dev/disk/disk31   /dev/rdisk/disk31

with a new disk's would like to know what steps to take to ensure data is not lost. I am unable to shut the server down

my OS is 11.31 and bl860 i2 model

Thanks

Re: Replace old disk with new disk online

Torsten. — Mon, 19 Dec 2011 17:44:31 GMT

This is a LUN from a hardware RAID. If you present another LUN with the same LUN# you need to work with scsimgr and replace wwid option (or just reboot). A new LUN with a new LUN# will get a new device file anyway.

Re: Replace old disk with new disk online

unix55 — Mon, 19 Dec 2011 18:19:30 GMT

Hi,

sorry but i don't understand what do you mean with.

- This is a LUN from a hardware RAID

- If you present another LUN with the same LUN# (what do you mean with LUN# and how

to present new LUN with same LUN# already available)

i would like to know what steps to make this without lost data and without reboot. i am a beginner on hp-ux

Thanks

Re: Replace old disk with new disk online

Torsten. — Mon, 19 Dec 2011 18:31:00 GMT

These are NOT plain disks presented to the server.

You have an array (made by EMC?), this presents LUNs to the server.

Ask your SAN or storage team for details!

Re: Replace old disk with new disk online

unix55 — Mon, 19 Dec 2011 20:19:48 GMT

Hi,

thanks for your support, but incase if idon't have EMC storage how to replace the old disk from EMC storage with new disk from IBM storage without lost data.

by using HP-UX command

Thanks

Re: Replace old disk with new disk online

Torsten. — Tue, 20 Dec 2011 05:47:50 GMT

You have 2 options:

1) take a data backup, remove the old disks, bring the new disks in place and restore the data

2) mirror the data from the old to the new drives; then remove the mirror from the old drives, remove the old drives

Re: Replace old disk with new disk online

unix55 — Tue, 20 Dec 2011 06:52:44 GMT

Hi,

thanks for your support, but can you tell me the steps for option 2

"2) mirror the data from the old to the new drives; then remove the mirror from the old drives, remove the old drives"

if i want to replace these disk

with these disk

disk     20 64000/0xfa00/0x8   esdisk CLAIMED     DEVICE       online DGC     CX4-960WDVR
                      /dev/disk/disk20   /dev/rdisk/disk20
disk     21 64000/0xfa00/0x9   esdisk CLAIMED     DEVICE       online DGC     CX4-960WDVR
                      /dev/disk/disk21   /dev/rdisk/disk21
disk     22 64000/0xfa00/0xa   esdisk CLAIMED     DEVICE       online DGC     CX4-960WDVR
                      /dev/disk/disk22   /dev/rdisk/disk22

Thanks

Re: Replace old disk with new disk online

Dennis Handly — Tue, 20 Dec 2011 07:16:12 GMT

>but can you tell me the steps for option 2?

Do you have magic hardware mirroring on your storage device? Probably not likely if old is EMC and new is IBM.

Otherwise you would need to have/purchase software mirroring, Mirrordisk/UX:

https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=B2491BA

Re: Replace old disk with new disk online

Torsten. — Tue, 20 Dec 2011 07:23:46 GMT

extend the VG with the new disks, mirror the LVOLs to the new disks, then remove the mirror from the old disks and reduce the old disks from the VG.

Re: Replace old disk with new disk online

unix55 — Tue, 20 Dec 2011 13:21:03 GMT

Hi Torston,

thanks for you support, tell me if the below steps are correct for my issue

Old disk

disk 7 64000/0xfa00/0x6 esdisk CLAIMED DEVICE online DGC VRAID
/dev/disk/disk7 /dev/rdisk/disk7

disk 14 64000/0xfa00/0x8 esdisk CLAIMED DEVICE online DGC VRAID
/dev/disk/disk14 /dev/rdisk/disk14

New Disk

disk 20 64000/0xfa00/0x8 esdisk CLAIMED DEVICE online DGC CX4-960WDVR
/dev/disk/disk20 /dev/rdisk/disk20

disk 21 64000/0xfa00/0x9 esdisk CLAIMED DEVICE online DGC CX4-960WDVR
/dev/disk/disk21 /dev/rdisk/disk21

# ioscan -fnC disk

# insf

# pvcreate /dev/rdsk/disk20

# pvcreate /dev/rdsk/disk21

# vgextend vg03 /dev/dsk/disk20 =====> i add the new disk

# vgextend vg03 /dev/dsk/disk21 =====> i add the new disk

# lvextend -m 1 /dev/vg03/lvol1 /dev/dsk/disk20 ====> i mirror the new dik for all lvol under vg03

# lvextend -m 1 /dev/vg03/lvol1 /dev/dsk/disk21

# lvextend -m 1 /dev/vg03/lvol2 /dev/dsk/disk20

# lvextend -m 1 /dev/vg03/lvol2 /dev/dsk/disk21

# lvreduce -m 0 /dev/vg03/lvol1 /dev/dsk/disk7 ====> i remove the mirroring for old disk

# lvreduce -m 0 /dev/vg03/lvol1 /dev/dsk/disk14

# vgreduce vg01 /dev/dsk/disk7

# vgreduce vg01 /dev/dsk/disk14

# rmsf -a /dev/dsk/disk7

# rmsf -a /dev/dsk/disk14

# rmsf -a /dev/rdsk/disk7

# rmsf -a /dev/rdsk/disk14

please tell me if any step is not correct

Thanks

Re: Replace old disk with new disk online

Torsten. — Tue, 20 Dec 2011 14:11:02 GMT

Looks good.

Replace

# lvextend -m 1 /dev/vg03/lvol1 /dev/dsk/disk20 ====> i mirror the new dik for all lvol under vg03

# lvextend -m 1 /dev/vg03/lvol1 /dev/dsk/disk21

# lvextend -m 1 /dev/vg03/lvol1 /dev/dsk/disk20 /dev/dsk/disk21

Same for all the other LVOLs during mirror/unmirror.

For "rmsf" I would do

# rmsf -k -H <hardware path>