"Pete's" <empete2000@yahoo.com> schrieb im Newsbeitrag
news:6724a51f.0409020609.6c48f5e9@posting.google.c om...
> emebohw@netscape.net (sumGirl) wrote in message
news:<a5e13cff.0408271324.404a2a36@posting.google. com>...
> > Hi all. Discovered recently that our bonehead previous admin turned
> > off mirroring for a bunch of LVs (all software mirrored...dont ask)
> > and in the process of remirroring many important things, I got to
> > wondering if I should mirror page space? Downsides, upsides, etc...?
>
> If you mirror your paging space(s), remember you'll incurr two disk
> writes. All of my paging spaces are un-mirrored, in fact, I've
> created 4 of equal sizes.
>
> HTH,
> pete's

Hi Pete,

Did you read through this thread? ;-) Let me deliver a short summary of
what has been discussed so far.
1) Paging space is memory. If you lose your unmirrored disk with a used
paging space you lose memory. Try to think about what consequences that
could have.
2) AIX defaults to mirror paging space since at least 4.3.2 for this reason.
3) The biggest advantage of using mirrorvg is that you cannot forget to
mirror your paging space(s) and the jfs log. Using it (together with
unmirrorvg) will safe you from many headaches.
4) To minimize impact of paging space reads/writes place paging space in
center or middle area of disk. Make sure all paging space partitions are
contiugous.
5) More than one paging space per disk is almost never necessary and in most
cases wrong.

HTH,
Andreas