From: Bill Verzal (Bill_Verzal@BCBSIL.COM)
Date: Fri Oct 11 2002 - 12:41:37 EDT
Interesting - AIX 5.2 talks of a new feature allowing you to create
temporary volume groups so you can copy them and then return the VG back to
its normal state. This may not be too clear - I just skimmed over the new
AIX 5.2 release notes and saw something related to temporary volume groups
and copying them.
BV
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Bill Verzal
Technical Consultant
Forbes Technical Consulting
(312) 653-3684
bill_verzal@bcbsil.com
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"Green, Simon"
<SGreen@KRAFTE To: aix-l@Princeton.EDU
UROPE.COM> cc:
Sent by: "IBM Subject: Re: migrating a filesystem/lv from one disk to two disks
AIX Discussion
List"
<aix-l@Princet
on.EDU>
10/11/2002
11:32 AM
Please respond
to "IBM AIX
Discussion
List"
The difference is in the stripe size. Doing striping at the partition
level gives you strips of, say 16MB. A proper striped LV will have stripes
of a few kB. An I/O operation will only benefit from striping if it is
writing data that spans two stripes. That's not terribly likely with a
16MB stripe; probably only going to affect backup/recovery and things like
tablespace scans.
With a smaller stripe, many more I/O operations will be able to benefit.
I can't comment on which is best for you.
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: 11 October 2002 12:43
To: aix-l@Princeton.EDU
Subject: Re: migrating a filesystem/lv from one disk to two disks
>Another option would be to delete the filesystem, recreate it
Well, I thought about this. I could create a "real" striped lv/filesystem
then.
However, I never tested the performance of a striped LV versus a LV thats
distributed manually between several volumes?
Is this a big difference in performance? What is the technical difference
at all?
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