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SubjectRe: PROBLEM: drivers/scsi/sd.c - Incorrect Reporting of Blocks and Capacity of Large SCSI Disk Arrays
| From: "James Bourne" <james@fsm.com.au>
|
| drivers/scsi/sd.c - Incorrect Reporting of Blocks and Capacity of Large
| SCSI Disk Arrays
|
| This problem exists on both a custom 2.4.20 kernel and on a stock RedHat
| 2.4.18-19.8.0smp kernel. This problem report pertains to the latter kernel.
|
| For example:
|
| SCSI device sdb: -562247552 512-byte hdwr sectors (4294679426 MB)
| sdb: sdb1
| SCSI device sdc: -1997908992 512-byte hdwr sectors (76582 MB)
| sdc: sdc1
|
| Array Capacity
| Total unformatted capacity for Array 1: 1962814MB (1916.81GB, 1.87TB)
| Total unformatted capacity for Array 2: 1261809MB (1232.23GB, 1.20TB)
-----

Please try the patch below.
Andries

----------------------------------------------------------------
From aeb Fri Dec 13 00:15:47 2002
To: anders.henke@sysiphus.de, linux-kernel@vger.kernel.org
Subject: Re: using 2 TB in real life
Cc: marcelo@conectiva.com.br
Content-Length: 974

> SCSI device sdb: -320126976 512-byte hdwr sectors (-163904 MB)

Yes, the code in 2.4.20 works up to 30 bits.
A slight modification works up to 31 bits.
[This is cosmetic only.]

Andries

--- /linux/2.4/linux-2.4.20/linux/drivers/scsi/sd.c Sat Aug 3 02:39:44 2002
+++ ./sd.c Fri Dec 13 00:12:00 2002
@@ -1001,7 +1001,7 @@
*/
int m;
int hard_sector = sector_size;
- int sz = rscsi_disks[i].capacity * (hard_sector/256);
+ unsigned int sz = (rscsi_disks[i].capacity/2) * (hard_sector/256);

/* There are 16 minors allocated for each major device */
for (m = i << 4; m < ((i + 1) << 4); m++) {
@@ -1009,9 +1009,9 @@
}

printk("SCSI device %s: "
- "%d %d-byte hdwr sectors (%d MB)\n",
+ "%u %d-byte hdwr sectors (%u MB)\n",
nbuff, rscsi_disks[i].capacity,
- hard_sector, (sz/2 - sz/1250 + 974)/1950);
+ hard_sector, (sz - sz/625 + 974)/1950);
}

/* Rescale capacity to 512-byte units */

-
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