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)
hi,
all 3 configs are ok ! u have to choose which will meet u best.
1. the more volumes the more space u give away for the parity disk of each raidgroup 2. u have a service contract ? when u will get new parts ? no contract = 2 spares 3. R/W performance is better on bigger volumes with more spindles... 4. reconstrution is normal no performance issue, but in this time while reconstructing, the disks have more work to do and the chance to get a second disk break increases
why dont u build 1 volume with 8 (for better performance), 1 with 4 (expandable for future) and 2 spares ?
hope this helps
/dev/zero
Other suggestions are welcome too.
Many Thanks,
Regards,
/dev/null