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# raw disk space to user space

Posted on 2006-11-15
Medium Priority
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gents, i'm almost embarrassed to ask, but how the heck do i calculate raw disk space to user space?

i.e. a disk of say 96GB raw or whatever, what is that in user space?

LePiaf
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Question by:lepiaf
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Callandor earned 2000 total points
ID: 17948318
You mean after it is formatted?  That is not usually a problem - the real discrepancy is when the manufacturer uses decimal notation to designate the size, and the operating system uses binary notation.  Divide 96GB by 1024^3 to get the OS reported space.
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Author Comment

ID: 17948491

let me put it like this: i've received the information that the maximum volume size supported by a certain NAS filer is 96TB raw, hence the question how much of those 96TB is the "useable" space?

Thanks and cheers,

LePiaf
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LVL 69

Expert Comment

ID: 17948575
Do you mean GB or TB?

The amount of usable space depends on whether you configure the NAS as RAID-0, RAID-1, RAID-5 or JBOD.  RAID-0 and JBOD gives you all the space (but RAID-0 will lose all info if one drive fails), RAID-1 will give you half the space, and RAID-5 will give you n-1 drives' worth of space, where n is the number of drives in the array.
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LVL 4

Author Comment

ID: 17954090
it is actually a RAID DP, so two parity disks.

What i'm really looking for is the formula to calculate X amount of raw space into user space.

many thanks,

LePiaf
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LVL 4

Author Comment

ID: 17954227
Thanks Callandor, i was being dump ;-)

Cheers,

LePiaf
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