Re: Removing (unconfigured) disks from RAID-5 array?

Interesting. Is there any documentation on this?


The current parity optimization is: Balanced

Type choice, press Enter.
Select parity optimization

1. Availability
2. Balance
3. Capacity
4. Performance


Rob Berendt
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IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
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http://www.dekko.com





From: Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>,
Date: 08/19/2013 01:33 PM
Subject: Re: Removing (unconfigured) disks from RAID-5 array?
Sent by: midrange-l-bounces@xxxxxxxxxxxx



As Larry pointed out the rules for SCSI and SAS are different since the
controller cards are completely different.

I think in V6 and up with the right RAID cards you could go into SST and
set the RAID configuration rules. From SST, Work with Disk
Configuration, option 8 work with device parity protection and then
Option 7 select parity optimization you were able to pick from 1)
availability, 2) balance, 3) capacity, and 4) performance. Those
options changed how the system would stripe the disk units.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 8/19/2013 12:17 PM, rob@xxxxxxxxx wrote:

We have multiple 5886 SAS disk units full with twelve 140 GB drives

each.

The raid stripe spans all 12 drives. The SCSI disk enclosures we have
seem to follow the 4 or 8 rule.


Rob Berendt
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