I agree with your thinking but no, at least not with internal disk. As
Marc mentioned you can do it with external disk but the clustering
does need to be set up in advance. It's all about the O/S's knowledge
of the disks. If the O/S knows about them via the cluster then how
exactly they got there is not important. The SAN did it so that's good
enough. With internal disk you don't have that option.
You cannot simply 'introduce the O/S' to some disks and say: "Trust me
these here are an iASP" like Windows or Linux will simply 'see' a
bunch of disks and bring them on line.
- Larry "DrFranken" Bolhuis
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.
On 11/5/2015 3:58 PM, Evan Harris wrote:
Hi MarcThis is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
Thanks for the response. We have done a few planned swaps with IASPs
in the same cluster, my question was more of a general one prompted
by thinking about storage. So what I am wondering is: if I know what
disks/LUNs form part of an IASP can I define that on a another system
that had no previous knowledge of it and just bring it online.
For example, I can do a conceptually similar thing by copying storage
spaces from an i-on-i guest LPAR to an other system and simply by
attaching them to some virtual scsi adapters I can get the whole
system to fire up.
Can I do a similar thing with an IASP ?
For clarity I am not trying to do this as part of a HA role swap or
as part of a cluster I am just kind of curious as to whether i can
(for example) run up copies of IASPs on another system on an ad hoc
basis by manipulating the associated storage.
Hope that explains further what I am wondering about.
On Fri, Nov 6, 2015 at 8:28 AM, Marc Rauzier <marc.rauzier@xxxxxxxxx>
Le 05/11/2015 20:15, Evan Harris a écrit :
We have been doing some lab work on PowerHA and the technologies
and have a question regarding IASP storage:.The source and destination systems must be members of the same
Is it possible to attach an IASP to a new system and keep the
contents of the IASP intact, and if so h ow ?
If I had 3 LUNs defined in an IASP and copied that storage to 3
other LUNs is it possible to then attach that storage as an IASP to
a new system and bring the IASP up on the different system ?
cluster and must be defined in the device domain. You do have to
have one destination system per target system until 7.2. There are
improvments in 7.2 regarding this sentence but I did no tested them
While the target IASP is varied off, you can then use a flashcopy
from the source volumes to the target volumes and then, vary on the
IASP on the target system. PowerHA provide STRxxxSSN commands to
initiate the flashcopy. xxx is SVC for an SVC (and brothers like
V7000) external storage. xxx is ASP for DS8x00 external storage.
I am not aware of any possibility to do the same clone operation
with internal disks.
We do it every night on around 20 clusters to perform the backup to
tape operation on the target systems.
The PowerHA SystemMirror for i redbook as a chapter for this kind of
I realize there could be some application dependencies missing like
profiles, JOBDs or whatever, but from a pure data/storageYes. The administrative domain provided by PowerHA can help you to
perspective is it possible to do what I am asking.
synchronize user profiles, job descriptions, job queue definition
(not the content), and so ....
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