[5039] in linux-scsi channel archive
Re: Large DPT RAID-5 "drive" reporting wrong size under fdisk... (help)
daemon@ATHENA.MIT.EDU (Tomasz Przygoda)
Sun Nov 1 14:04:18 1998
Date: Sun, 01 Nov 1998 13:54:46 -0500
From: Tomasz Przygoda <tprzyg@securities.com>
To: Jeff Wiegley <jeff@la.usweb.com>
CC: linux-scsi@vger.rutgers.edu, linux-kernel@vger.rutgers.edu
This is a multi-part message in MIME format.
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I made this patch some time ago when I run into a problem with 68GB
RAID5 drive being seen as only 4GB :(.
Unfortunately you need to recompile a kernel with this patch and put it
on the RedHat install diskette, as well as to substitute the kernel that
will be installed.
-- Tomek,
"In theory there's no difference between theory and practice, but in practice...."
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name="bigdrives.patch"
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filename="bigdrives.patch"
--- linux/drivers/scsi/scsicam.c.orig Mon Jun 29 15:33:48 1998
+++ linux/drivers/scsi/scsicam.c Mon Jun 29 15:32:58 1998
@@ -45,6 +45,7 @@
struct buffer_head *bh;
int ret_code;
int size = disk->capacity;
+ unsigned long temp_cyl;
if (!(bh = bread(MKDEV(MAJOR(dev), MINOR(dev)&~0xf), 0, 1024)))
return -1;
@@ -67,6 +68,11 @@
if (ret_code || ip[0] > 255 || ip[1] > 63) {
ip[0] = 64;
ip[1] = 32;
+ temp_cyl = size / (ip[0] * ip[1]);
+ if (temp_cyl > 65534) {
+ ip[0] = 255;
+ ip[1] = 63;
+ }
ip[2] = size / (ip[0] * ip[1]);
}
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