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AW: AW: RAID greater than 2TB on Fedora Core 3



Title: AW: AW: RAID greater than 2TB on Fedora Core 3

> No, it's the SCSI protocol.  SCSI allows 4 bytes (32 bits) to specify
> the block number on a device, or 4,394,957,296 blocks.  Given that most
> disks use a 512-byte block, that's:
>
>       4,394,957,269 * 512 = 2,199,023,255,552 bytes
>
> or 2TB.  And before people jump on me, it's an unsigned 4-byte block
> number.  A signed value would make no sense--how do you access a
> negative block number?  I hear that the latest SCSI spec addresses this,
> but I have no idea when (or if) it will be released and how long the
> manufacturers will take to implement the new spec (if ever).
>
> As an aside, the old 2GB file size limit was caused by using a signed
> 32-bit value as the second parameter in an lseek() (2^31 is
> 2,147,483,648, and that's in bytes--not blocks and it was signed to
> allow you to seek backwards from the current postition).

Hi Rick,

all right this seems to be the problem in my case (Adaptec 39160 cannot
go beyond the 2TB limit!).

Do you know any PCI-SCSI-Controlers (not PCI-X) which will provide the
16-Byte SCSI-commands?

thanks,
christian


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