From: Chris Leven (Chris.Leven@GARLOCK.COM)
Date: Wed Nov 12 2003 - 11:07:40 EST
No matter what you do, because of the raid 5 you will be writing to multiple
disks every write anyway. That is one reason most people try to stay away
from raid 5 and Oracle combination. It is just very slow when you do it.
We live with the performance in the Shark because of the extensive cache
available but straight SSA raid 5 will be a performance bottleneck with
Oracle.
Christopher Leven
Senior Programmer/Analyst
IBM Certified Specialist AIX Administration
IBM Certified Specialist AIX Support
IBM Certified Specialist RS6000/SP - PSSP 3.1
Garlock Sealing Technologies
An EnPro Industries Company
1666 Division Street
Palmyra, New York 14522
*Voice: 315.597.3034
*Fax: 315.597.7250
*Email: Chris.Leven@Garlock.com
-----Original Message-----
From: Chris Gregors [mailto:Chris.Gregors@TELUS.COM]
Sent: Tuesday, November 11, 2003 5:56 PM
To: aix-l@Princeton.EDU
Subject: Re: How to assign a specific disk in RAID to a particular VG/LV
['Watchdog': checked]
Well.. There actually is one way that _might_ work.
Note: there are a lot of if statements in the following
Note: lmigratelv is the command internal to the migratepv script.
#include <std-disclaimer.h>
if (( stripe size == PE size ) &&
( you know which PE's contain the parity ) &&
( you can map a raid PE to an PV PE ) &&
( you can figure out how to use lmigratelv ) &&
( you are extremely confident )) {
You can shift PE's around to your hearts content
} else {
nope.
}
Sorry for writing it in pseudo-code. I've been hacking a lot lately.
Chris.
-----Original Message-----
From: Bill Verzal [mailto:BVerzal@KOMATSUNA.COM]
Sent: Tuesday, November 11, 2003 6:34 AM
To: aix-l@Princeton.EDU
Subject: Re: How to assign a specific disk in RAID to a particular VG/LV
['Watchdog': checked]
You can't.
--------------------------------------------------------
"If everything is coming your way, then you are in the wrong lane"
Bill Verzal
AIX Administrator, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
G V Raju
<rajugv@INGVYSYAB To: aix-l@Princeton.EDU
ANK.COM> cc:
Sent by: IBM AIX Subject: How to assign a
specific disk in RAID to a particular VG/LV ['Watchdog':
Discussion List checked]
<aix-l@Princeton.
EDU>
11/10/2003 06:41
PM
Please respond to
IBM AIX
Discussion List
Hai All,
We have 5 Hard disks in RAID 5 on P620 Machine.
I want to create two lvs, one for Oracle REDO Logs and Other for Oracle
Archive Logs. I want to place these two LVS on two separate physical hard
disks. But because of RAID 5 of all the available hard disks, I could able
to see only one physical volume at AIX level.
Please tell me whether can I allocate specific hard disk out of RAID to a
particular LV?
Regards
G V Raju
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