Not something you can add to the plan now, but if the filesystems are
defined using LVM (Logical Volume Manager), then you can add the new disks
to the LVM volume group, then use pvmove and pvremove to migrate and remove
the older volumes. In this way, you can migrate to the new disks (for the
most part) without bring down the Linux image.
You'll still have to bring it down and copy the /boot minidisk by hand, then
bring the image back up, but it will decrease your downtime dramatically, if
the image is large.
We used this method to migrate just over half a terabyte from one DASD
system to another, making the "movement" of the image take under a half
hour, and used it on smaller images as well.
The vageries of hardware being what they are, we're in the process of doing
this all again right now, this time within the same box, to get into a
single logical controller so that the z/OS folks can move toward GDPS
without us.
--
.~. Robert P. Nix Mayo Foundation
/V\ RO-OE-5-55 200 First Street SW
/( )\ 507-284-0844 Rochester, MN 55905
^^-^^ -----
"In theory, theory and practice are the same, but
in practice, theory and practice are different."
On 8/31/07 8:44 AM, "David Boyes" <[EMAIL PROTECTED]> wrote:
>> I need to move all of my Linux volumes from an Hitachi box (that will
>> eventually be going out the door) to a new box. Most of the Linux dasd
>> are 3390-3 with a couple of mod 1's used for swap vols.
>
> If you have VM, define minidisks on the new box, shut them down and
> image copy from the old disks to the new minidisks. As long as the
> virtual addresses remain the same in the virtual machines, Linux won't
> know or care.
> DDR will work, as will FDR image restore...8-)
>
>> Before I forget, I was going to move the model 1's that are used as
> swap
>> space to VM mini disks, and I was thinking about using a mod 9+ (aka
>> mod 27 or larger) to hold the swap mdisks for several of the Linux
>> systems. Does anyone know if this is a good, bad, or doesn't matter
> idea?
>
> Ditch real disks entirely and switch to VDISK. Get a copy of SWAPGEN
> from www.sinenomine.net and don't look back.
>
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