There used to be a Clariion Pocket Reference that you could get from PowerLink but it is restricted now and is not available. It had all the translation of published drive size and actual drive size.
If you have the actual drive type in your array you can always look at the properties of one of the disks under the Physical tree and it will show the usable capacity. If you don't have the drive type in your array then %90 is a safe number for usable capacity. Example a 500GB drive would have 450GB of usable space for conservative calculations.
Could be an EMC only internal tool. You will find references to nice tools that we can't have every now and then in some of the documentation.
I find it pretty easy to just perform calculations on the fly if you know the raw drive capacities. For instance below are the actual usable sizes of FC drives on a Clariion.
So if I want to know how much space a 5 disk RAID 5 group with 146GB drives will give me I use the following forumula:
4 (number of data disks in R5(4+1) x 133.64 (usable capacity of 146GB drive) = 534.72GB
It is also easy enough to build something in excel with the data above in formulas. I just know the sizes off the top of my head and just use a calculator when figuring it out.
That makes perfect sense. I do have a spreadsheet that has specific formulas but was unable to determine where some of the numbers came from and it did not cover some of the newer drive sizes.
For instance, the formula for a 36GB drive is (69186096*512)/(1024^3) = 32.99.
The formula is consistent across all drives but the first number is not. I'm sure this is also probably used in getting the usable drive sizes that you also have listed.
With that said, do you know what this particular number represents and where it can be found for say a 500GB SATA drive?
I do have the drives installed in the array and as you stated the properties of the drive states RAW capacity. This serves the purpose of what I was looking for. I was trying to make it more difficult than what it actually was.
1 GB = 1,000,000 MB (this is scientifically correct; 1 binary Gigabyte is known as Gibibyte, in short GiB) 300GB is therefore 300,000,000 / 1024 / 1024 = 286,102 MB.
The same goes for all other types of drives. 90% Is not a good value, it's more like 286102/300000 = 95.37%
Furthermore: a Clariion uses 520 sectors instead of 512, so you might want to take that into the equasion as well. A Symmetrix uses free tracks betweens symdevs and in those machines it depends how many hypers you have per spindel.
I didn't say that 90% is a GOOD number, but a SAFE number.
A 146GB FC drive in a CLARiiON array has 133.68 GB of usable space. This equals 91.56%. A 73GB FC drive in a CLARiiON array has 66.64 GB of usable space. This equals 91.29%. Both of these numbers are I believe closer to 90% than 95%. In fact using 95% would be more error prone since you would be over estimating the usable space of a drive.
Since we don't have access to internal tools that provide all the "real" usable capacities I prefer to instruct people to use SAFE numbers in their calculations if they don't have the actual values for usable space on a drive.
Also your numbers on a 300GB FC drive are not correct. A 300GB FC drive on a CLARiiON array has 268.4 GB of usable space. Which is 89.47%
AranH1
2.2K Posts
0
January 11th, 2008 09:00
If you have the actual drive type in your array you can always look at the properties of one of the disks under the Physical tree and it will show the usable capacity. If you don't have the drive type in your array then %90 is a safe number for usable capacity. Example a 500GB drive would have 450GB of usable space for conservative calculations.
AranH1
2.2K Posts
1
January 10th, 2008 15:00
I find it pretty easy to just perform calculations on the fly if you know the raw drive capacities. For instance below are the actual usable sizes of FC drives on a Clariion.
73GB drive = 66.64 usable
146GB drive = 1333.68 usable
300GB drive = 268.40 usable
So if I want to know how much space a 5 disk RAID 5 group with 146GB drives will give me I use the following forumula:
4 (number of data disks in R5(4+1) x 133.64 (usable capacity of 146GB drive) = 534.72GB
It is also easy enough to build something in excel with the data above in formulas. I just know the sizes off the top of my head and just use a calculator when figuring it out.
twist2open
3 Posts
0
January 11th, 2008 05:00
For instance, the formula for a 36GB drive is (69186096*512)/(1024^3) = 32.99.
The formula is consistent across all drives but the first number is not. I'm sure this is also probably used in getting the usable drive sizes that you also have listed.
With that said, do you know what this particular number represents and where it can be found for say a 500GB SATA drive?
Thanks!
twist2open
3 Posts
0
January 11th, 2008 12:00
Thanks again for all your help!
bthessel-sRige
22 Posts
0
January 14th, 2008 06:00
http://www.ibeast.com/content/tools/RaidCalc/RaidCalc.asp
AranH1
2.2K Posts
0
January 14th, 2008 08:00
RRR
4 Operator
•
5.7K Posts
0
January 15th, 2008 05:00
300GB is therefore 300,000,000 / 1024 / 1024 = 286,102 MB.
The same goes for all other types of drives.
90% Is not a good value, it's more like 286102/300000 = 95.37%
Furthermore: a Clariion uses 520 sectors instead of 512, so you might want to take that into the equasion as well. A Symmetrix uses free tracks betweens symdevs and in those machines it depends how many hypers you have per spindel.
AranH1
2.2K Posts
0
January 15th, 2008 08:00
A 146GB FC drive in a CLARiiON array has 133.68 GB of usable space. This equals 91.56%. A 73GB FC drive in a CLARiiON array has 66.64 GB of usable space. This equals 91.29%. Both of these numbers are I believe closer to 90% than 95%. In fact using 95% would be more error prone since you would be over estimating the usable space of a drive.
Since we don't have access to internal tools that provide all the "real" usable capacities I prefer to instruct people to use SAFE numbers in their calculations if they don't have the actual values for usable space on a drive.
Also your numbers on a 300GB FC drive are not correct. A 300GB FC drive on a CLARiiON array has 268.4 GB of usable space. Which is 89.47%
TonyB2
1 Message
0
January 18th, 2008 08:00
It was a usefull tool and I am sorry to see it go.
dinesh.patil-vd
1 Message
0
May 13th, 2011 23:00
Where do I find the clarrion capacity calculator
B4FQqUoIrW12094
60 Posts
0
May 14th, 2011 02:00
Go to EMC Services Partner Web
Select EMC CLARiiON
Under Implementation Resources , you will find CLARiiON Capacity Calculator
https://servicepartners.emc.com/restricted/service/implementation/CapacityCalcV4.41.zip
eduardo_b_steph
6 Posts
0
August 18th, 2011 07:00
Hi,
I found the zip file, but it need a password to extract
do you know this password?
kelleg
4 Operator
•
4.5K Posts
0
August 18th, 2011 13:00
please DO NOT post passwords on this forum
glen
tkjoffs
159 Posts
0
August 28th, 2011 22:00
Oh now that takes all the fun out of it.
Now how are we going to acess tools that should be general use?