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SAS - Logical drive max size

Darren Gannon
Occasional Visitor

SAS - Logical drive max size

I have a new dl360 G5 with 6 72GB SAS drives attached to a smart array P400i and when i try to configure my logical drives its telling me the max size for a logical drive is 329395GB. Why is the max size so small?
5 REPLIES
Darren Gannon
Occasional Visitor

Re: SAS - Logical drive max size

Sorry, its actually MB not GB.
Michael Richter
Trusted Contributor

Re: SAS - Logical drive max size

Hi Darren,

P400:
Support for up to 2TB in a single logical drive.

What kind of Array ar u using? May u can attach an ACU Screen?

Cheers
Mike
Rajashekar Chintakunta
Honored Contributor

Re: SAS - Logical drive max size

Hi Darren,

I feel you are creating Raid 5 on this 6 x 72GB hdds.

The Array Capacity: (Size of Smallest Drive) * (Number of Drives - 1).

So it will be 72 * (6-1) = 360GB. That will be the max size of the array, but there is alos a overhead of the file system i.e some 5%. Because of that it is giving you 329395MB as the size.

Please check the following link for more info:
http://wiki.emdstorage.com/RAID/RAID5

Regards,
Raj.
Darren Gannon
Occasional Visitor

Re: SAS - Logical drive max size

I guess it was the raid overhead. I don't see any unused disc space once the array was configured. I think its kind of dumb how the wizard makes the raid overhead look like available disk space. Or maybe i'm just dumb. : )
Gus Kwong
Respected Contributor

Re: SAS - Logical drive max size

Sounds like SAS disks have greater overhead than U320... I am pretty sure the DL380g3 with 6x72GB disks had available space more than that...
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