Re: Disk Mirroring

Evan,
Check out the Redbook “IBM i and IBM Storwize Family: A Practical Guide to
Usage Scenarios”

http://www.redbooks.ibm.com/redpieces/abstracts/sg248197.html


-----Original Message-----
From: Evan Harris
Sent: Tuesday, December 15, 2015 1:59 PM
To: Midrange Systems Technical Discussion
Subject: Re: Disk Mirroring

Hi Larry

they report as 2145-050 but for some reason the i does not seem to
recognise that they are protected (I kind of thought the 050 signalled
this....)

Do you have any advice as to what commands we should be using on the V7k to
create the LUNs or to customise them after they are created and before we
use them in the i ?

On Wed, Dec 16, 2015 at 3:33 AM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

What type are those SAN LUNs reporting in as? 6B22-050? 2145-050?
Something else? (Something-109 comes to mind...)


- Larry "DrFranken" Bolhuis

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

On 12/15/2015 1:14 AM, Evan Harris wrote:

Hi Larry

that's where I got to, but for some reason the SAN LUNs don't show up as
protected and then the system wants to protect them.

I am presuming there is something the V7k administrator needs to in

order

for the disk to show up as protected; what configuration step could they
be
missing here - any clues ?

Any configuration on the i side we need to do in SST ?

Caveat: for reasons slightly beyond our control we are doing this

without

a
HMC on a single partition system.


On Tue, Dec 15, 2015 at 6:05 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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Regards
Evan Harris
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