On Fri, Apr 22, 2011 at 4:53 AM, David Robillard <david.robillard@xxxxxxxxx>wrote: > > > With that in mind, you might want to change the 2 x 1 TB LUNs for 4 x > 512 GB LUNs. But keep in mind that if you need to add more disk space > to either disk groups, you will need a 512 GB LUN which is relatively > big. That is to satisfy the ASM data distribution and balance > operation as the fine manual says: « Oracle ASM data distribution > policy is capacity-based. Ensure that Oracle ASM disks in a disk group > have the same capacity to maintain balance. » In other words, use LUNs > of the same size in the same disk group. > > Hi David, Thanks for the detailed mail. One thing I tend to disagree is minimum 4 LUNs per diskgroup recommendation. Isn't creating smaller LUNs, increases the LUNs maintenance in the DG like having smaller datafiles for tablespaces. At least that was the theory i had come up with fewer bigger LUNs within DG. As all LUNs will be coming off of same RAID set, does it really matter having smaller LUNs? I understand to increase the DG, i would need another TB, but if database is NOT going grow beyond allocated space, it shouldn't be a problem right. Thanks, Steven.