Replace old disk with new disk online

[unix55]

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

[Torsten.]

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.

[unix55]

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

[Torsten.]

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!

[unix55]

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

[Torsten.]

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

[unix55]

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

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

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

[Dennis Handly]

>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

[Torsten.]

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.

[unix55]

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