Re: using 2 TB in real life

Mike Black (mblack@csi-inc.com)
Thu, 12 Dec 2002 07:03:45 -0500


Looks like it's already handled in 2.5.
Here's a patch for 2.4:
http://www.gelato.unsw.edu.au/patches-index.html

----- Original Message -----
From: "Anders Henke" <anders.henke@sysiphus.de>
To: <linux-kernel@vger.kernel.org>
Sent: Thursday, December 12, 2002 6:12 AM
Subject: using 2 TB in real life

> I've just added a 1.9 TB array to one of my servers (running 2.4.20,
> the device is an 12bay-IFT IDE-to-Fibre-RAID connected via a
> Qlogic 2300 HBA):
>
> Disk /dev/sdb: 255 heads, 63 sectors, 247422 cylinders
> Units = cylinders of 16065 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 247422 1987417183+ 83 Linux
> [...]
> Attached scsi disk sdb at scsi2, channel 0, id 0, lun 0
> SCSI device sdb: -320126976 512-byte hdwr sectors (-163904 MB)
> sdb: sdb1
>
>
> Another array (1.2 TB) gives almost the same effect:
> Disk /dev/sdb: 255 heads, 63 sectors, 157450 cylinders
> Units = cylinders of 16065 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 157450 1264717093+ 83 Linux
> [...]
> Attached scsi disk sdb at scsi2, channel 0, id 0, lun 0
> SCSI device sdb: -1765523456 512-byte hdwr sectors (195564 MB)
> sdb: sdb1
>
> These issues arise when using arrays larger than around 0.5 T;
> nevertheless, these devices do work fine with both xfs or ext3,
> it's "just" a cosmetical issue. However, this negative
> values make one feel like Linux isn't truely capable of using up to
> 2 TB of disk devices and so this should be resolved.
> To me it seems that sd.c doesn't know how to calculate the
> correct values for such beasts - any ideas?
>
>
> Regards
>
> Anders
> --
> http://sysiphus.de/
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