From: Bill Verzal (Bill_Verzal@BCBSIL.COM)
Date: Wed Sep 04 2002 - 10:39:54 EDT
If there are only 2 disks, consider using the "-t" option to add more PP's
to the disks. Recall that this will change the max # of drives in the VG
each time you double the -t value.
Other than that, I'd go with the 1GB PP size.
--------------------------------------------------------------------------------------------------------
Bill Verzal
Technical Consultant
Forbes Technical Consulting
(312) 653-3684
bill_verzal@bcbsil.com
MailStop: 27.201C
Dave.Zarnoch@S
UNGARD.COM To: aix-l@Princeton.EDU
Sent by: "IBM cc:
AIX Discussion Subject: PP size recommendations?
List"
<aix-l@Princet
on.EDU>
09/04/2002
09:21 AM
Please respond
to "IBM AIX
Discussion
List"
Folks,
We will be installing some new disk drives into our system
They will be using RAID 5
Here's what the customer suggests:
1.
The limiting variable is # of pp's per hdisk = 1016. Since we have 2 hdisks
in our stripe, we can get 2032. The current pp size is 256mb which allows
for 2032*256mb = 520gb of logical volumes, total. We need almost double
that, so using pp size of 512mb is essential. Using a pp size of 1024mb or
1gb may be better.
The total space for Volume Group vg00 will be 1.1 TB
It will be comprised of 2 hdisks which are striped also.
Which would be better to use?
512MB/PP
1024MB/PP
The data residing on the disk will be db2 databases
Thanks!
Dave Zarnoch
UNIX Systems Administration
SunGard eSourcing
600 Laurel Oak Rd.
Voorhees, NJ 08043
Dave.Zarnoch@sungard.com
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