Mirror copy from local to san

[Adam Winebaugh]

Anyone,
What I need to do is to mirror a secondary local disk to the san, Then break the mirror and format my secondary local disk to mirror to my boot disk. Make sense?
I think I need to run vgextend and "enclose" the san disk in my vg, then create the lvol's on it to match those of the secondary local disk, then run a vgreduce and remove the local vol, causeing the alternate link to the SAN disk to become primary, then format my secondary local disk and mirror it to my boot disk? Make sense? Am I missing steps? Please advise.

[James R. Ferguson]

Hi Adam:

Mirroring logical volumes is a good way to replicate them from disk to disk.

Yes, mirror a logical volume from the local disk to the SAN; Then 'lvreduce -m 0' the *local* copy leaving the "SAN" copy. When the "local" disk is devoid of all logical volumes, then 'vgreduce' or 'vgremove' it from its volume group and do with it as you wish.

Regards!

...JRF...

[Steven E. Protter]

Shalom,

You can do it.

But to make it bootable you need a system that can boot of san. Not all models can.

I think its much better to have an alternate local boot disk.

Steps:



pvcreate -B /dev/rdsk/c1t0d0 #use real disk

mkboot -l /dev/rdsk/c1t0d0
mkboot -a "hpux -lq (;0)/stand/vmunix" /dev/rdsk/c1t0d0 # use real disk


# mkboot -b /usr/sbin/diag/lif/updatediaglif -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c?t?d?

If you are running 64-bit OS:

# mkboot -b /usr/sbin/diag/lif/updatediaglif2 -p ISL -p AUTO -p HPUX -p PAD -p LABEL /dev/rdsk/c?t?d?


vgextend /dev/vg00 /dev/dsk/c1t0d0 # same thing
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c1t0d0

# real disk. repeat for other lvols

lvlnboot -r /dev/vg00/lvol3 # root fs /
lvlnboot -s /dev/vg00/lvol2 #swap
lvlnboot -d /dev/vg00/lvol2 #swap/dump
lvlnboot -b /dev/vg00/lvol1
lvlnboot -R
lvlnboot -v
setboot
setboot -a 52.1.0 # second disk

SEP

[Adam Winebaugh]

Right, I know how to mirror a boot disk that part is not in question. I was just curious if I was missing any steps.

James, Why do I need to do an lvreduce -m 0 on the local vol, instead of just running a vgreduce? Ok just so we are clear, (i am not overly bright) run it down by command if you would please, if you have a local disk you need to mirror to a san disk, to open the local disk for mirroring from the boot disk. THANKS!!!

[James R. Ferguson · Accepted solution]

Hi Adam:

> Why do I need to do an lvreduce -m 0 on the local vol, instead of just running a vgreduce?

The answer is so that you don't leave any orphaned logical volume extent information in the VGRA of the volume. See the 'vgreduce' manpages.

Regards!

...JRF...

[Tim Nelson]

And because the vgreduce will fail due to extents in use on the device.