online lun resize 11.31

[centurion]

I resize my lun at the storage-box (hp eva), no problem. But my lun in the lvm has the old size.

When I make the same procedure with a lun, which is not under lvm-control, then it works?!

Any ideas?

11.31
LVM 1.0

[Torsten. · Accepted solution]

You need to use vgmodify to adjust the LVM layout.

[centurion]

the problem is, when I use diskinfo - the lun has the old size. I think vgmodify is the next step.

[Torsten.]

I would do an ioscan and then the vgmodify.

Example:

# vgmodify vg01

Current Volume Group settings:
Max LV 255
Max PV 16
Max PE per PV 2559
PE Size (Mbytes) 4
VGRA Size (Kbytes) 400
"/dev/rdsk/c3t0d1" size changed from 10485600 to 20971520kb
An update to the Volume Group IS required
...

[centurion]

I already use the ioscan - old size.

when I make the same procedure with a test lun, which is not under lvm control, then I can see the new size automatically with diskinfo. the ioscan is not necessary.

[Torsten.]

Does vgmodify detect the new size or not?

[centurion]

root@system01[/root]# vgmodify vgtest
vgmodify: The volume group "vgtest" is active on this system. Use the -a option to perform the requested change.

root@system01[/root]# vgmodify -a vgtest
vgmodify: Error: -a option should be used with either -e, -p, -l, -o, -B, -C,
-R or -E options.


Which options are necessary?

[centurion]

root@system01[/root]# vgmodify -E -a vgtest
"/dev/rdisk/disk66" size changed from 31457280 to 41943040kb
Volume Group configuration for /dev/vgtest has been saved in /etc/lvmconf/vgtest.conf

Very nice, one volume has the new size. But the second volume the old?!

[Torsten.]

From manual:

The vgmodify command supports LUN expansion on a Version 1.0 volume group without
deactivating the volume group. To reconfigure an activated volume group to take advantage of
a physical volume size increase, use the â E and â a options to vgmodify. For example, if the
physical volume /dev/disk/disk32 in volume group vg02 has been expanded, use the
following command to add physical extents to it:
# vgmodify -a -E /dev/vg02 /dev/rdisk/disk32



For more information, see vgmodify(1M).

[centurion]

root@system01[/root]# vgmodify -E -a vgtest /dev/rdisk/disk61
An update to the Volume Group is NOT required
Volume Group configuration for /dev/vgtest has been saved in /etc/lvmconf/vgtest.conf

[Torsten.]

First I would double check with commandview and evainfo if the LUN increase operation was performed successfully.

[centurion]

command view shows the correct size.

[Torsten.]

From manual instructions:


1. Review current volume group parameters.
# vgdisplay vg1
...
2. Use online vgmodify in review mode to review the effect of the change in disk size.
# vgmodify â r -a -E vg1
"/dev/rdisk/disk43" size changed from 52428800 to 71687369kb

An update to the Volume Group IS required
Review complete. Volume group not modified
3. Use online vgmodify to change the disk size.
# vgmodify -a -E vg1
"/dev/rdisk/disk43" size changed from 52428800 to 71687369kb

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01920387/c01920387.pdf (BSC link updated by admin)

[Steven E. Protter]

Shalom,

What you are seeing is why its actually easier to present a new LUN to the system than to increase the size of an existing one.

It is very difficult and sometimes impossible to get an HP-UX system to recognize a LUN has increased.

Here we generally do not issue large LUNS, we issue a 300 GB LUN as 10 30 GB LUNS, and use LVM to put them together in a volume group. Then when we need another 30 GB, we just present a new LUN to the system and use vgextend etc to handle it.

This is a method that involves less headaches.

If your system won't recognize the space after the above procedures, and/or a reboot, you should consider an alternate way of doing this to avoid the amount of fun you are currently experiencing.

SEP

[Torsten.]

Please post an

# vgdisplay -v vgtest

# swlist

[centurion]

root@system01[/root]# vgdisplay -v vgtest
--- Volume groups ---
VG Name /dev/vgtest
VG Write Access read/write
VG Status available
Max LV 128
Cur LV 1
Open LV 1
Max PV 128
Cur PV 2
Act PV 2
Max PE per PV 12000
VGDA 4
PE Size (Mbytes) 128
Total PE 1118
Alloc PE 799
Free PE 319
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
VG Version 1.0
VG Max Size 192000g
VG Max Extents 1536000

--- Logical volumes ---
LV Name /dev/vgtest/lvol1
LV Status available/syncd
LV Size (Mbytes) 102272
Current LE 799
Allocated PE 799
Used PV 1


--- Physical volumes ---
PV Name /dev/disk/disk61
PV Status available
Total PE 799
Free PE 0
Autoswitch On
Proactive Polling On

PV Name /dev/disk/disk66
PV Status available
Total PE 319
Free PE 319
Autoswitch On
Proactive Polling On



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[centurion]

@Steven E. Protter:

the problem is, that we use synchronous-mirror (hp svsp) and we can always make a mirror with one volume. so we have to resize the volume.

[Torsten.]

Never worked with hp svsp so far, but maybe additional adjustments are needed?

[centurion]

at the moment the sync. mirror is not active. this is a problem with the os/lvm.

with the vgmodify I can resize the size from one volume, but the other volume has the old size. :-(

[centurion]

after I deactivate the vg, the diskinfo shows the new size from all physical volumes!
now I activate the vg and with vgmodify I can also see the correct size!

now I need a way to make this online..

[Duncan Edmonstone]

it doesn't surprise me that everything started working when you deactivated the vg and ran the diskinfo... in this case the device would have been completely closed and the call to diskinfo would have accessed the LUN again for the first time.

What is supposed to happen for an "online" resize operation is that according to SCSI standards the device is supposed to respond with Unit Attention (ASC/ASCQ: 0x2A/0x9 = capacity data changed) on the next IO after the lun capacity is changed. This causes the IO stack to do a reopen detect increased capacity.

Whether the SVSP _does_ respond with the correct Unit Attention message I don't know (I know some NetApp systems don't do this and that the EVA and XP _do_ work correctly). You could ask your support contacts for some clarity on this...

HTH

Duncan