Re: Disk Mirroring

Another quick point. The mirroring will only act on devices that are
already configured into the ASP, be it *SYSBAS or an iASP. I will very
often allow the SSDs to be in *SYSBAS, start mirroring on them, then add
the other "spinny" drives to the ASP or iASP after starting RAID on them.

Requires a small bit of forethought but it works well.....

On Mon, Dec 14, 2015 at 11:05 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Evan,

When you start Mirroring you are starting it for an ASP. Mirroring
will pair up all disks in that pool which are not already protected by
either Mirroring or RAID.

Once you start Mirroring on the ASP any disks added to it will
automatically be Mirrored UNLESS they are already protected either by RAID
or by the storage subsystem (SAN or Host partition).

So the Secret is don't add the SAN LUNS to the system until after
you have mirrored the SSDs. The SAN LUNS are supposed to me flagged as
already protected so you will be allowed to add them to the system without
them being mirrored by IBM i.


- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 12/14/2015 2:32 PM, Evan Harris wrote:

Hi guys

is it possible to start mirroring on a pair of disks without starting
mirrorign on every other disk in the system ? If so, what are the steps to
achieve this ?

I have a system which has a pair of SSDs in the base enclosure but the
rest
of the storage is intended to be provided by a SAN (V7000). The problem
is
that starting mirroring keeps wanting to protect the SAN LUNs, or adding
the LUNs to the ASP causes the system to want to configure mirroring on
the
newly added disk units.

I've looked in the info centre and found a few different PDFs on Disk
management but primarily they talk about starting mirroring on the disk
pool when I really just want to start it on a pair of disks and leave all
the other disks without protection - at least as far as the i is
concerned.

The only thought at this point is to start RAID on the disks prior to
adding them to the ASP and then end RAID once they are added. But this
sure
seems like the long way around.

Is this possible ?

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