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тАО12-01-2010 03:54 AM
тАО12-01-2010 03:54 AM
i would like to determine how much is my disk arrays size on EVA. I have 10 disks on my disk controller and each one's size is 146 GB.
So total disk amount is 10*146= 1460 Gb
But on EVA in Storage Capacity area i see:
Total: 1365 Gb
Used: 1184Gb
Available: 181 Gb
Q:
1. I think total amount should be 1460 Gb but why VA shows me 1365Gb?
Before redundancy size were 300Gb but now is 181Gb. Will it become lower and lower?
Regards,
Rustam
Solved! Go to Solution.
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тАО12-01-2010 04:51 AM
тАО12-01-2010 04:51 AM
Solutionyou should post this in relevant sub segment of this forum.
this disk capacity that you see in available capacity is influenced by the spare disk "single" or "dual" protection that you have set.
Also your 146 gb disk are actually 135.9G, if you have kept say double protection for the virtual disk group , then further take out approx 2.5 % from each of your disk,and not to forget the space reduction with the chossen raid level.
check if that add out/ rounds off to what you see.
Regards,
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тАО12-01-2010 06:31 AM
тАО12-01-2010 06:31 AM
Re: My disk arrays amount
But that physical disk is then carved up to size you want to see presented into logical disks.
Configuring the physical disk to become multiple logical disks requires a measure of overhead. And what the total impact that has against the size used for overhead depends on how you "carve" it up.
Generally if you carve up into smaller sized logical disks to get more disks it takes more overhead.
By reverse, if you carved up into larger logical disk size resulting in less amount of disk it takes less overhead.
Regards,
Rita
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тАО12-01-2010 06:34 AM
тАО12-01-2010 06:34 AM
Re: My disk arrays amount
For example RAID5 will take at least (3+1), so you will see as usable the 3 disks, but you lose the 1 disk to parity.
If you went for mirrored disk, then you just half of your disk as usable storage to mirroring.
/rcw
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тАО12-01-2010 06:57 AM
тАО12-01-2010 06:57 AM
Re: My disk arrays amount
Always the disk will not have the full capacity for usage.
As DeafFrog said, the disk will have the real value to less than 146GB (app 136GB)...
So for 10 Disks, it is around 95GB less value from the actual value...
Rgds..
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тАО12-01-2010 09:28 AM
тАО12-01-2010 09:28 AM
Re: My disk arrays amount
That is just the difference between "HardWare GigaBytes": what is written on the disk drive: 146GB (if you look at the number of blocks, you'll see that it is a bit larger - see below)
and "SoftWare GigaBytes": what is shown in Command View EVA. You see that on other storage arrays or on operating systems as well.
From a real-life EVA:
according to SSSU, a BF1465A693 disk drive has 286749488 blocks of 512 byte each.
That makes 286,749,488 Blocks * 512 Bytes/Block
= 146,815,737,856 Bytes
Most humans calculate
146815737856/1000/1000/1000 = 146.815
which gives about 146.8 HWGB
(1000 is 10^3)
The EVA does not calculate with base10.
It calculates: 146815737856/1024/1024/1024
(1024 is 2^10)
Which gives about 136.7324 SWGB per disk drive.
There is no capacity lost!
It is the same as when I write: 5 = 101
Oh, I meant:
5(10) = 101(2)
;-)
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тАО12-02-2010 12:58 AM
тАО12-02-2010 12:58 AM
Re: My disk arrays amount
I think that the Total in Storage Capacity is the sum of the Total of all the disk groups.
But the total of a disk group (in CV: specific disk group, TAB General, section Capacity) I think that includes the spare level.
My example: EVA 4100, CV 9.01.00.090604, FATA disk group, 8 x 500GB FATA.
In Disk Group: Total=2793 GB - spare level=1 (2 disks reserved)
So: 2793/(8-2)=465.5 GB each disk
And (see Uwe post): 465.5*1024*1024*1024=499826819072 bytes
OK HD is 500 GB
Rustam: do you see 1365 GB in Total ? But your spare level ? Maybe is 0...
Max
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тАО12-02-2010 11:30 PM
тАО12-02-2010 11:30 PM
Re: My disk arrays amount
Now a bit confusing is here also. My disk arrays' is used by 2 servers. First server has 3 presentationed disks (mounted points) and second server has 4 presentationed disks(mounted points). The sum of first servers mounted pointed is 330 Gb and second server's 540Gb.
So 540Gb+330Gb=870Gb values are used from EVA. But my EVA capacity is 1365GB.where are other Gbs?
Sorry if i'm asking stupid question. But i need make report and then if we will see whole problem , buy new disks or ...
Regards,
Rustam
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тАО12-02-2010 11:54 PM
тАО12-02-2010 11:54 PM
Re: My disk arrays amount
CV has an online help...
The essential informations are in CV, specific disk group.
The spare level is "Disk drive failure protection".
The raid level is specific for each LUN.
Capacity: see attach. In my example, 2793 GB (spare level 1, see my previous post). The row vraid5=593 GB states that I can create a LUN of 593GB (max) in vraid5. But if I create a LUN in vraid0 the LUN is 741 GB. Obviously the raid uses storage space for redundancy...
Max
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тАО12-20-2010 12:52 AM
тАО12-20-2010 12:52 AM
Re: My disk arrays amount
Now i understood why my EVA shows me 1366 GB. Coz each my disk's actual size is 146.7 Gb but software size is 136.73 Gb. As Uwe mentioned above it's software gigabyte. My protection level is 'Single'. So 2 disks are reserved but why i see 1366 Gb - (2 disks)= instead 1366 - 273.46 = 1092.54 Gb?
I also determined that my LUN's raid is RAID5.
Regards,
Rustam