From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Thu Jan 09 2003 - 07:22:52 EST
If you are mirroring your rootvg, then you should mirror all paging spaces.
Otherwise you're giving up your protection if you have a disk failure. (The
system will keep running until it needs to page in from the failed disk, at
which point it will probably crash.)
I can't remember if a mirrored dump LV is valid or not: I thought that the
correct way to configure it was to have two dump devices on separate disks.
However, if you have a disk failure it's usually obvious enough that you
don't need a dump to sort it out.
The advantage of having a separate dump LV, rather than using a paging space
is that you can reboot the system quickly and still have access to the dump
for analysis without having to copy it first. You could copy it to a
secondary paging space, (i.e. not hd6), which isn't set to swapon
automatically, but then you've got to remember to activate it manually after
a reboot. I think it still needs to be in rootvg, so that might be awkward
unless you've got a rootvg with many disks in it.
Simon Green
Philip Morris ITSC Europe
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-----Original Message-----
From: rohan chandrashekar [mailto:rohanchandrashekar@YAHOO.COM]
Sent: 08 January 2003 17:50
To: aix-l@Princeton.EDU
Subject: secondary paging
I have a AIX 4.3.3 system on which I have the paging space and the dump
device mirrored. Both the rootdisk and the mirrored disk are in the rootvg
volumegroup. The dump device and the paging space are not the same on the
same logical volume.I want to know if I can remove the paging space from the
mirrored disk and use it as a secondary paging space..?
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