Re: Stock 2.6.4 with CONFIG_LBD=y and qla2xxx driver, reportswrongdevice size

[Terrence Martin <tmartin@physics.ucsd.edu>]

Thanks Guy, I think I might just do that, create an MD device out of 3 
equal sized disks.

Where I may have gone wrong and gotten confused is that the Logical 
Drive limit is 64TB. However I have now read, and I assume it is still 
current, that each LUN is only 32bits limiting a LUN to 2TB. You then 
need some sort of additional RAID (hardware or software) presumably to 
map those LUNS to a single disk.

Linux RAID0 should handle this nicely I think.

Thanks

Terrence


Guy wrote:

>Beyond my knowledge...  Wish I was you!  :)
>
>But, if the device has a bug like "bit 33 lopped off".
>If he splits the array into 2 luns/devices then it may be fine.
>Then create the RAID0 with them.
>
>Guy
>
>-----Original Message-----
>From: James Bottomley [mailto:James.Bottomley@SteelEye.com] 
>Sent: Wednesday, March 24, 2004 5:01 PM
>To: Guy
>Cc: 'Terrence Martin'; 'SCSI Mailing List'
>Subject: RE: Stock 2.6.4 with CONFIG_LBD=y and qla2xxx driver,
>reportswrongdevice size
>
>On Wed, 2004-03-24 at 16:53, Guy wrote:
>  
>
>>This is just a guess!!!!!  But I think I am correct.
>>    
>>
>
>The standards are very explicit about what READ CAPACITY(10) should
>return for a >2TB device.  sd detects this and retries with a READ
>CAPACITY(16).
>
>There is no message in the log indicating this happened, so I think the
>device reported an incorrect size to READ CAPACITY(10).  It may have
>reported its size with bit 33 lopped off, but that's still a device
>problem.
>
>James
>
>
>
>  
>