Paul,
If you are at V7R1 you don't need to power down to remove the drives from
the configuration. You can do it while the system is running. As to
physically removing them, if you are taking the entire RAID set anyway,
don't bother with stopping it. Let whoever gets those drives on the used
market deal with it. They have to anyway to prepare them for resale.
Remember there's no data on them at this point. You could use the SST
function to physically remove them while the system is running if downtime
is a scarce commodity.
Also, unless you have very heavy I/O most of the time, don't be afraid to
end allocation and then drain the drives during the day. The process runs
in the background and is very rarely disruptive.
Otherwise your procedure looks good to me.
--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steinmetz, Paul
Sent: Wednesday, January 07, 2015 9:59 AM
To: 'Midrange Systems Technical Discussion'
Subject: Removing disk units that have device parity protection from a disk
pool without mirrored protection
I'm looking for the latest doc - Removing disk units that have device parity
protection from a disk pool without mirrored protection From the IBM
Knowledge Center, IBM i: Systems management Disk management, I found this
table/checklist.
I want to confirm that this is current, and this process STILL cannot be
done concurrently (Requires IPL to DST) My additional notes below is to
minimize the down window (4 - Remove unit from configuration) after IPL to
DST.
Task What to do Where to learn more
1.___ Display your current disk configuration. "Evaluating the current
configuration" on page 6 2.___ Calculate the space requirements for the disk
pools that are involved in disk removal.
"Calculating disk space requirements" on page 8 3.___ Use option 21 from the
Save menu to save your entire system.
Save your system with the GO SAVE command 4.___ Restart your system and
select the option to use dedicated service tools (DST).
"How to Start Dedicated Service Tools (DST)" in Backup and Recovery. From
the taskpad in System i Navigator, select OpenSystem i Navigator Service
Tools.
5.___ Remove disk units that you plan to remove from the system.
"Removing a disk unit from a disk pool" on page
101
6.___ Exclude the disk units from device parity protection. If you were
successful in excluding the disk units, skip to task 8. Otherwise, continue
to task 7.
"Excluding disk units from a parity set" on page
25
7.___ Stop device parity protection for all the disk units in the
Input/Output Processor (IOP).
"Stopping device parity protection" on page 24 8.___ Physically remove disk
units. If you stopped device parity protection in task 7, continue with task
9. If you did not stop device parity protection, skip to task 10.
"Removing a disk unit from a disk pool" on page
101
9.___ Start device parity protection again. "Starting device parity
protection" on page 22 10.___ Verify that your disk unit configuration is
correct. "Evaluating the current configuration" on page 6 11.___ Print your
disk configuration to have available in case a recovery situation occurs.
"Printing your disk configuration" on page 7 12.___ Restart your system.
Disk removal
Removing disks require shutting down system, steps 1 thru 3 can be done
ahead to minimize down time, steps 4 on require down time. (Checklist 9 -
Backup and Recovery)
1) STRASPBAL TYPE(*ENDALC) UNIT(10 11 12 13 14 15 16 17 18) - This marks the
disks for those you want to remove
2) CHKASPBAL
Unit 10 is selected for end allocation.
Unit 11 is selected for end allocation.
Unit 12 is selected for end allocation.
Unit 13 is selected for end allocation.
Unit 14 is selected for end allocation.
Unit 15 is selected for end allocation.
Unit 16 is selected for end allocation.
Unit 17 is selected for end allocation.
Unit 18 is selected for end allocation.
3) STRASPBAL TYPE(*MOVDTA) TIMLMT(*NOMAX) - This will run for 3 to 6 hours -
suggest running at night.
4) PWRDWNSYS with restart (*NO) 5 - minutes
5) IPL using manual mode to DST 5 - minutes
6) Signon to DST
7) Logically remove from the ASP -
option 4 - (work with disk units)
option 1 - (work with disk configuration) option 3 - (work with ASP
configuration)
4 - Remove unit from configuration - If step 3 above already moved majority
of data, time should be minimal, 10 minutes for all disks.
8) Stop device parity protection for IOA - 3 minutes
9) Power down system
10) From HMC, power off frame that includes the disks
11) Physically remove disks from the system
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/
midrange.com
