Re: [Iometer-devel] 34 bit LBA support

[<jo...@ei...>]

Hey Luke, thanks for the concern.  IOMeter doesn't care about  
sectors/LBAs, it deal with bytes (that gives you the ability to do  
misaligned transfers).

When we are dealing with disks targets, the maximum disk size, the  
current transfers starting offset and ending offset are all unsigned  
64bit values.

So that means, theoretically, we can support 55bit LBAs or something  
like 16 exabytes, where a 16byte/32byte SCSI command can support 8  
zettabytes.  Now I say theoretically because there may be something  
that has been overlooked.

But keep in mind that IOMeter has been used for a long time by many  
disk array manufacturers and I would be willing to bet some of them  
have gone quite large.  My largest "raw" block device was a 16TB  
array, I did that under both linux and windows and I don't recall any  
major problems but that was 3 years ago or so.  Maybe someone else  
will pipe in with a larger example.

Hope this helps,
Joe

Quoting Luk...@se...:

>
> Does IOMeter support 34 Bit LBA's?   (LBA ranges greater than 32 bits long)
>
> If not, are there any plans to make it so that it is able to do so?
>
> Eventually, drives are going to become larger than 2.14 Terabytes and will
> support LBA addresses larger than 32 bits long.
>
> - Luke.
>
>
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