RE: new asm disks

Having 2 different disk sizes would only be for a week or so while I
rebalance and drop the smaller disks out.


> -----Original Message-----
> From: Lawie, Duncan [mailto:duncan.lawie@xxxxxxxxxxxxxxxxx]
> Sent: Monday, October 23, 2006 9:27 AM
> To: Steiner, Randy; oracle-l@xxxxxxxxxxxxx
> Subject: RE: new asm disks
> 
> Randy,
> 
> Mixing different sized disks is not great practice if that is how you
want
> to run.  Ideally they will end up the same percent full ...
> 
>  1* select name, total_mb, free_mb, 100*free_mb/total_mb pct_free
>      from v$asm_disk where group_number = 3
> SQL> /
> 
> NAME                    TOTAL_MB    FREE_MB   PCT_FREE
> --------------------- ---------- ---------- ----------
> DATA1                      34851      25166 72.2102666
> DATA2                      69711      50361 72.2425442
> 
> but you can get problems where they don't balance evenly.
> 
> However, if your intent is a straight swap, I would feel reasonably
> confident in adding the new disks, allow the rebalance to get going,
then
> dropping the old disks.
> 
> (Mostly because it allows you to avoid the whole pain associated with
your
> second question.)
> 
> HTH,
> Duncan.
> 
> ________________________________
> 
> From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of Steiner, Randy
> Sent: 23 October 2006 14:05
> To: oracle-l@xxxxxxxxxxxxx
> Subject: new asm disks
> 
> 
> 
> My asm disk group is composed of 72 gig 15k rpm disks.  I have new 320
gig
> 15k rpm disks that I want to add to the database, eventually replacing
the
> existing disk.  While the disks spec to be the same speed, they were
made
> about 2 years apart, so I'm guessing there is still a difference in
> performance.
> 
> 
> 
> Question 1, is it still ok to add the new disk to the existing
diskgroup
> and rebalance the old disk out?
> 
> 
> 
> Question 2 would it be better to create a new disk group and then
figure
> out a way to move the tablespaces to the new diskgroup?
> 
> 
> 
> Thanks
> 
> Randy
> 
> 
> 
>
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