RAID IOPS Calculator?

[thorwitt]

Hi,

anybody know a webseite or an excel with a RAID IOPS calculator for sizing vmware solution?

Could not find one for RAID 50...

Asking for it because the VMware Sizer from HP seems not to work for RAID 50 correctly!

Need 4000 IOPS peak / 2000 IOPS average

HP VMware Sizer put this to me:

RAID5 = 38x146 GB 15K SAS

RAID10 = 26x146 GB 15K SAS

RAID50 = 18x146 GB 15K SAS <- could this be true?

Hope to get some help

[AntonVZhbankov]

Take a look at http://www.wmarow.com/strcalc/

---

MCSA, MCTS, VCP, VMware vExpert '2009

http://blog.vadmin.ru

[thorwitt]

Very nice but no RAID 50 IOPS calculation

[RParker]

RAID sizing is easy.

RAID 50 is RAID 5 array striped with RAID 0, similar to RAID 10 (minimum 6 drives -- 2 or more RAID 5 groups)

RAID 10 is RAID 1 Mirror striped with RAID 0. Since it's a mirror that means only half the drive is available, thus have the space is usable. (N /2 disks).

RAID 5 is parity striped across ALL the disks, 1 disk essentially equals the parity. (N -1 disks)

RAID 6 is the same as RAID 5 except it's 2 parity drives.(N - 2 disks)

Take the TOTAL number of disks you have, compute use the N formula to determine disks. So if you have 16 146GB disks, and you want RAID 10, that is 8146=1.168 TB or 1168 GB of space. RAID 5 would be 15146=2.19 TB or 2190 GB. RAID 6 would be 14*146=2.04 TB or 2044 GB.

I am sure you can search for RAID sizing on google and find something, but its easy once you know how the RAIDs work. From there you can simply count your disks, and do the math.

[golddiggie]

You could try this site:

I just used bing to search () for iops calculator and that was one of the top results.

There are some links to Excel files on the first page too...

VMware VCP4

Consider awarding points for "helpful" and/or "correct" answers.

[RParker]

GOOGLE, you know the search engine, I found LOTS of articles on the subject.

Here is an excerpt of one of them..

I found a formula and tweaked it a bit so that it fits our needs:

(TOTAL IOps × % READ)+ ((TOTAL IOps × % WRITE) ×RAID Penalty)

So for RAID-5 and for instance a VM which produces 1000 IOps and has

40% reads and 60% writes:

(1000 x 0.4) + ((1000 x 0.6) x 4) = 400 + 2400 = 2800 IO’s

The 1000 IOps this VM produces actually results in 2800 IO’s on the

backend of the array, this makes you think doesn’t it?

http://www.yellow-bricks.com/2009/12/23/iops/

If you spend just a few minutes you can figure this out for yourself. We don't necessarily keep all this stuff in our heads either, but we are resourceful enough to find the answer for ourselves.

[thorwitt]

I know google and most of the links. But my question was about RAID-50, because of the HP VMware Sizer.

TOTAL IOps × % READ)+ ((TOTAL IOps × % WRITE) ×RAID Penalty)

Does anyone know the RAID Penalty for RAID-50 or RAID-60 or other RAID levels?