From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Thu Nov 28 2002 - 02:59:18 EST
It's not "thrown away". However, LVM will see your RAID array as a single
disk. If you had a VG consisting of two separate arrays, then the intra
policy would come into effect, but only between those two logical disks.
That will apply for any sort of RAID array.
Simon Green
Philip Morris ITSC Europe
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AIX FAQ at http://www.faqs.org/faqs/aix-faq/
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-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: 27 November 2002 17:05
To: aix-l@Princeton.EDU
Subject: raid5 and intra-policy
Hello,
if I have non-raid disks (just "normal") disks I can use intra-policy to
place lvīs. Sometimes you gain nothing here, sometimes quite a lot (reduce
head-movement).
If you use raid5 (f.e. on ssa) you see f.e. 1 logical disk (PV) but have 5
physical disks.
My question: Does the raid-controller throw away my placement-commands or
does it implement them?
I see no reason why it should throw them away, but thats not an answer to
this question...
Can anybody answer this for ssa/hds/emc or whatever?
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