On Wed, Aug 07, 2002 at 11:24:19AM -0400, devnull@adc.idt.com wrote:
I am trying to decide on the number of volumes for our F810 which has a DS14 shelf(FC-AL), with 14 36G drives.
By default Ontap puts 8 disks in a RAID group.
I guess i am trying to figure out if
I should have 2 volumes vol0 and vol1, one with 8 disks and one with 5 disks and i have ONE spare for both the volumes (Is this safe in terms of ratio of disks used to spares ? )
Have 2 volumes(6 + 6) and 2 spares
Have 1 volume with 13 disks and 1 spare. (reconstruction time on failed disk would be high, and i dont know if there will be performance issues esp in calculating parity etc)
Personally, I only put archive data on vol0. This gives me a small bit of online archival space without worry of a rouge script killing me. The raid set size on 36G drives is suggested to be 10 (by NetApp) so if you did a 2 disk raids set on vol0 (1d+1p) and then vol2 with remaining - spares this would probably meet your needs. I like what someone else said about your support contract dictating the number of spares you keep. Also, if you have data that doesn't change frequently you could consider reducing the snap reserve from the 20% that comes with DOT to something more reasonable for your environment. C-
Other suggestions are welcome too.
Many Thanks,
Regards,
/dev/null