Date: Wed, 8 Jul 2009 14:35:41 -0700 (PDT)--
From: david@xxxxxxx
To: linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>
Subject: partition detection problem on 2.6.29.1 and 2.6.30
I have a system that has a large number of drives in it (45), and it's had a problem with banks of disks getting disconnected from it.
however, when I started looking into it today (after another sysadmin worked on it for a while), I found that the system is not able to access the partitions on the drives.
if I am reading dmesg correctly it is seeing the partitions during boot, and if I do 'fdisk -l' it lists all the paritions correctly, but if I try to do a
dd if=/dev/sdb1 of=/dev/null count=1
I get the error "dd: opening `/dev/sdb1': No such device or address"
#ls -l /dev/sdb1
brw-rw---- 1 root disk 8, 17 Nov 7 2006 /dev/sdb1
I removed udev and setup nodes manually to eliminate any possibility that it was a problem there.
the attachment partitions.missing.partitions is a cat of /proc/partitions
sysfs shows all the drives but none of the partitions.
if I run fdisk and do a write (which runs the ioctl to re-read the parition table) the system detects the partition and is able to access it until the next reboot.
what is going on here?
David Lang