Hi Gopal Thanks for the answer . Can you please let me know which part of the AWR report shows me the IOPS times. regards Hrishy --- On Sat, 8/11/08, K Gopalakrishnan <kaygopal@xxxxxxxxx> wrote: > From: K Gopalakrishnan <kaygopal@xxxxxxxxx> > Subject: Re: ASM LUN sizes and number of disks > To: hrishys@xxxxxxxxxxx > Cc: oracle-l@xxxxxxxxxxxxx > Date: Saturday, 8 November, 2008, 12:49 AM > Hrishy, > > The number of spindles are dependent on the required IOPS. > In theory a > 15K drive (Fiber channel) can sustain around 150-180 IOPS. > So if you are short on IOPS going to higher capacity disks > will make > your database much slower (in your new/upgraded config you > are > essentially cutting the I/O capacity by half) . > > Look at your AWR/Statspack to figure out your IOPS > requirement and > make your decision on moving to 200G drives. > > > Best Regards, > K Gopalakrishnan > Co-Author: Oracle Wait Interface, Oracle Press 2004 > http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/ > > Author: Oracle Database 10g RAC Handbook, Oracle Press 2006 > http://www.amazon.com/gp/product/007146509X/ > > > > On Thu, Nov 6, 2008 at 11:30 PM, hrishy > <hrishys@xxxxxxxxxxx> wrote: > > Hi > > > > We have a 200Gb database and there are 6X50gb luns > comprising a diskgroup called dataDG > > > > Since my database is growing around 100gb per year i > am planning to add two 200Gb disks to the above diskgroups > and simulatenously drop the 6 50gb disks off. > > > > I understand reblance would trigger in my case and i > am planning to add 200gb disks to the luns and increase the > diskgroup sizes. > > > > My question is there a formula or a rule of thumb to > determine the number disks and the size given a database > size and estimated growth rates? > > > > regards > > Hrishy > > > > > > > > > > -- > > //www.freelists.org/webpage/oracle-l > > > > > > > -- > //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l