Bug 5624 - fdisk and DAC960 driver problem
fdisk and DAC960 driver problem
Product: Red Hat Raw Hide
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Michael K. Johnson
Depends On:
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Reported: 1999-10-06 09:28 EDT by James Manning
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2000-02-05 18:44:21 EST
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Description James Manning 1999-10-06 09:28:23 EDT
This is on a Lorax 6.0.50 machine (will upgrade ASAP and
check that)

(3) Mylex DAC1164P's
   (1) exporting a 10x36.4GB raid5 array
   (2) exporting a 20x18.2GB raid5 array

# fdisk -l /dev/rd/c[012]d0

Disk /dev/rd/c0d0: 128 heads, 32 sectors, 7788 cylinders
Units = cylinders of 4096 * 512 bytes
Disk /dev/rd/c1d0: 128 heads, 32 sectors, 7788 cylinders
Units = cylinders of 4096 * 512 bytes
Disk /dev/rd/c2d0: 128 heads, 32 sectors, 7788 cylinders
Units = cylinders of 4096 * 512 bytes

# bc -q

If I make a partition, it sure enough only ends up being a
15GB filesystem... If I mke2fs on the /dev/rd/c0d0 instead
of a partition, I get the full ~270GB filesystem (losing 2
drives since the 10 drives are in 2 packs of 5 in the

[root@spiral ~]# df -h /raid5-*
Filesystem            Size  Used Avail Use% Mounted on
/dev/rd/c0d0          267G  258G  8.9G  97% /raid5-1
/dev/rd/c1d0          267G  246G   21G  92% /raid5-2
/dev/rd/c2d0          267G  199G   68G  74% /raid5-3

I'd imagine fdisk to be at fault since an ext2 on the
drive is the right size... *shrug* or is it neither the DAC
driver or fdisk at fault?
Comment 1 Cristian Gafton 1999-10-06 12:39:59 EDT
what version of util-linux are you running? Kernel version? etc...
Can you try 6.1 on that computer?

------- Additional Comments From   10/12/99 00:14 -------
To: jmm@raleigh.ibm.com
Date: Fri, 8 Oct 1999 13:44:42 -0700
From: "Leonard N. Zubkoff" <lnz@dandelion.com>
Subject: Re: fdisk and DAC960 driver

I believe you're running into the problem where with the 2GB (128/32)
geometry you run out of cylinders numbers.  Using the 8GB (255/63)
geometry allows one to go much larger.

Comment 2 James Manning 1999-11-18 06:57:59 EST
Please feel free to mark this bug resolved, as Leonard was right and
switching the DAC1164P to 8GB disk geometry fixed the problem.
Comment 3 Cristian Gafton 2000-01-04 17:25:59 EST
Assigned to dledford
Comment 4 Cristian Gafton 2000-01-04 17:26:59 EST
Assigned to dledford

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