Thanks, it's possible that somehow wafl's being computed twice. I'll look at that later today.
Thanks for the feedback, Nick
On 3/3/08 11:29 PM, "Milazzo Giacomo" G.Milazzo@sinergy.it wrote:
Hi
I think there's something wrong on how your calculator considers the snapshot for aggregate and for volume reservations. Starting i.e. from a 14x500 SATA shelf in Raid DP and NO spare we've 12 disks, so 6000 GB raw and, rightsized roughly 5100, and until here this is correct, but why with a ZERO reserve for aggregate and volume reservation the usable is only 4590? This is wrong. It seems that you've remeoved the 10% of WAFL reservation again! When in an autosupport you read i.e. 272 GB usable on a 300 GB FC disc this is the net size. Again, about snapshot reserve for volumes: could cause confusion to consider this value because the % reservation is for EACH volume, so it can vary your available size a lot...
Anyway for a quick calculation a guy in NetApp years ago told me: "take your usable disks (no spares, no parity) raw size, multiply for their numbers and remove 15% for FC and 20% for SATA disks"...
Bye