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
-----Messaggio originale----- Da: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] Per conto di Nicholas Bernstein Inviato: martedì 4 marzo 2008 1.00 A: Toasters Oggetto: Quick program I put together
All,
I put together a quick program which calculates the actual usable space you get based on the various configuration options you can set on a filer. It's a .net application but I'm guessing it should run via wine for any *nix folks. I need to add SAS disks as an option, and if anyone knows of an authoritative source on rightsizing (I calculated the percentages based on looking at specific disk information).
Anyway, it's somewhat thrown together and not completely finished, but I thought I would see if any folks out there might find it useful before I wasted any more time on it. Also, it would be nice to see how close it gets to people's actual configurations. I'm guessing there might be some rounding errors as well as some fuzzy rightsizing.
love to get some feedback, Nick