Re: Accessing SCSI-Devices >2TB

From: Eric Anderson <anderson_at_centtech.com>
Date: Wed, 08 Jun 2005 06:43:29 -0500
Daniel O'Connor wrote:
> On Wed, 8 Jun 2005 19:53, Raphael H. Becker wrote:
> 
>>The RAID was preconfigured with two 50% partitions which were assigned
>>to two LUNs. FreeBSD 5.4 was able to detect those as da1 and da2 with
>>full capacity.
>>
>>For particular reasons I need one filesystem.
>>
>>The support for this RAID told me just SuSE Linux and W2k3/64Bit Systems
>>are able to access devices >2TB (64bit LBA) therefore the larger RAIDs
>>are preconfigured with smaller partitions.
> 
> 
> This sentance doesn't make sense..
> They ARE able to access >2Tb so the RAID is _split_..
> 
> Why would you do that?
> 
> If they can access 2Tb disks then surely you'd just present it as one drive 
> and be done with it.

I think you missed what he was saying - he was saying that 'just' those 
two operating systems support 64bit LBA at this time, so the 
manufacturer by default sets up two LUNs instead of one large LUN to 
guarrantee support under all modern OS's and not just SuSE and W2K3/64bit.

FreeBSD doesn't support 64bit LUNs at this point as far as I know 
(unless it's a recent addition).

Eric




-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
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Received on Wed Jun 08 2005 - 09:43:53 UTC

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