topic Re: PVMOVE question in Operating System - HP-UX

PVMOVE question

Stefalap — Mon, 14 Jul 2008 16:47:03 GMT

We are migrating to a new SVC SAN. We need to migrate the data.

I ran the following commands

vgextend /dev/vg08 /dev/dsk/c110t0d0
pvmove /dev/dsk/c53t9d1 /dev/dsk/c110t0d0
vgreduce vg08 /dev/dsk/c53t9d1

Following these commands, are there still data on the old disk (c53t9d1)
If there are still data on it, how do i delete it?

Thanks in advance

Re: PVMOVE question

James R. Ferguson — Mon, 14 Jul 2008 16:56:43 GMT

Hi Stefalap:

Logically from an LVM perspective, there is no data on the old disk.

If, however, you mean could the information thereon be read, yes, the bit patterns remain. You could "clean" the old disk by writing zeros or random patterns to it n-times where n's value increases for increasing paranoia:

# vgreduce vg08 /dev/dsk/c53t9d1

...then:

# dd if=/dev/zero of=/dev/rdsk/c53t9d1 bs=1024k

...or:

# dd if=/dev/urandom of=/dev/rdsk/c53t9d1 bs=1024k

Regards!

...JRF...

Re: PVMOVE question

Stefalap — Mon, 14 Jul 2008 17:20:24 GMT

HI James

That was clear and great.
and YES Paranoia is the key word here

Re: PVMOVE question

Naveen M — Tue, 15 Jul 2008 06:21:24 GMT

To clear LVM header structures, we can use pvremove as well.