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LUN maximum size

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Dominique_11
Frequent Advisor

LUN maximum size

Hi,

My configuration:
Tru64 Unix v4.0G PK3
HSG80 ACS v88F-2

I created a LUN of 400Gb (in my HSG80)and I wish to know the maximun size of LUN (or disk) recognized by Tru64 (V4.0G).

Thank you in advance for your answer

Cordially

3 REPLIES
Rob Leadbeater
Honored Contributor
Solution

Re: LUN maximum size

Hi,

I think the maximum disk size in 4.0G is 1TB, although I couldn't find any definitive evidence to back this up.

Your 400GB LUN should be OK... Are you experiencing problems ?

Cheers,

Rob
Dominique_11
Frequent Advisor

Re: LUN maximum size

Hi,

Thank you for your answer.

I already had problems on Solaris and I never created LUN higher than 140 Go on Tru64 4.0G

Regards,

Dominique
DCBrown
Frequent Advisor

Re: LUN maximum size

Not sure where this is documented, but the limit is related to the following:

The last addressable sector returned by READ CAPACITY must be 0x7FFF.FFFE or less. This is the last addressable sector (0..n) of the LUN. The kernel code then adds 1 to get the total number of sectors (0x7FFF.FFFF) on the LUN. Some places within the kernel, this size information is stored in a signed 32bit variable. If the returned capacity is larger than 0x7FFF.FFFE, then you get overflow and the value becomes negative. Unpredictable behavior can follow.