RE: P9 with dual EJ14 - Raid5 and Hot Spare questions

Your second process is the correct one.
<snip>
1. Start device parity protection - RAID 5, omitting 1 disk unit.
Then
2. Start Hot Spare
</snip>

Is this a SAN or internal storage?

--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Steinmetz,
Paul
Sent: Friday, December 14, 2018 7:45 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: P9 with dual EJ14 - Raid5 and Hot Spare questions

Rob,

I found some verbiage from the disk management manual which states that you
need one hot spare per IOA.
But depending on how you start the hot spare, the system will create 2.

I used the option
3. Start device parity protection - RAID 5 with hot spare

What I think I needed to do is:
1. Start device parity protection - RAID 5, omitting 1 disk unit.
Then
2. Start Hot Spare

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Rob
Berendt
Sent: Friday, December 14, 2018 7:46 AM
To: Midrange Systems Technical Discussion
Subject: Re: P9 with dual EJ14 - Raid5 and Hot Spare questions

A hot spare is only good for one raid group. Among your choices are:
1 - no hot spares
2 - two raid sets with one hot spare each.
3 - one raid set with one hot spare
4 - two raid sets. One with a hot spare, one without. The hot spare is not
shared between the two.
There are more options. Like two hot spares per raid set. When creating a
secondary asp, composed of SSD's being self maintained, I did this.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail
to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>
Date: 12/13/2018 11:01 PM
Subject: P9 with dual EJ14 - Raid5 and Hot Spare questions
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



When configuring disks on a new P9 with dual EJ14, 24 SSD drives
Starting parity, Raid 5 with Hot Spare, one large parity set was created.
I wanted two parity sets, parity for performance, but the option to set
parity was not available.
Is this normal behavior.

After the single set was created, additional disk options became
available.
I changed parity for performance, stopped parity, then started Raid5 with
Hot spare.
Now I have two parity sets, with two Hot spares.
I really only wanted 1 Hot spare, no option for this.
I do see an option to stop Hot spare on one of the units.
I would then have to add this unit back in, but this unit would not have
any stripping, not recommended.

Any thoughts from the group?

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx
http://www.pencor.com/