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
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
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
So I think I fixed most of the bugs on the capacity calculator that people mentioned, and put a new version (0.9.2) up on http://nicholasbernstein.com/calc/. If anyone finds any new issues, or wants to give feedback, I'd love to hear what you think,
Nick
On 3/4/08 11:47 AM, "Nicholas Bernstein" nick@nicholasbernstein.com wrote:
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
Any chance you could add 750GIG SATA, and 1TB SATA? Would also be nice if your app stopped the raid group size at the max for FC or SATA (see bottom of e-mail) instead of going up and up and up :)
Just some suggestions, thanks for the cool app.
Maximum RAID Group Sizes RAID 6 (RAID-DP(tm)) FC or SAS: 28 (26 data disks plus 2 parity disks) SATA: 16 (14 data disks plus 2 parity disks)
RAID 4 FC or SAS: 14 (13 data disks plus 1 parity disk) SATA: 7 (6 data disks plus 1 parity disk)
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Nicholas Bernstein Sent: Wednesday, March 12, 2008 3:39 PM To: Toasters Subject: Re: R: Quick program I put together
So I think I fixed most of the bugs on the capacity calculator that people mentioned, and put a new version (0.9.2) up on http://nicholasbernstein.com/calc/. If anyone finds any new issues, or wants to give feedback, I'd love to hear what you think,
Nick
On 3/4/08 11:47 AM, "Nicholas Bernstein" nick@nicholasbernstein.com wrote:
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
Sure, I'll add those disk sizes, and max raid group sizes. As a FYI, the disk size is a text field, so you can manually put in any number. What I'd love is to put an XML file together with the disk size, right-size %, and type, but I don't want to have to keep it up to date, and I haven't seen a good central source for that information. :)
-Nick
On 3/14/08 9:09 AM, "Langdon, Laughlin T. (Lock)" Langdon.Lock@mayo.edu wrote:
Any chance you could add 750GIG SATA, and 1TB SATA? Would also be nice if your app stopped the raid group size at the max for FC or SATA (see bottom of e-mail) instead of going up and up and up :)
Just some suggestions, thanks for the cool app.
Maximum RAID Group Sizes RAID 6 (RAID-DP(tm)) FC or SAS: 28 (26 data disks plus 2 parity disks) SATA: 16 (14 data disks plus 2 parity disks)
RAID 4 FC or SAS: 14 (13 data disks plus 1 parity disk) SATA: 7 (6 data disks plus 1 parity disk)
-
Langdon, Laughlin T. (Lock) -
Milazzo Giacomo -
Nicholas Bernstein