Red Hat Bugzilla – Bug 65461
(IDE SERVERWORKS)mount /dev/cdrom fails on on Compaq DL360G2 with Serverworks OSB4 IDE
Last modified: 2007-03-26 23:53:29 EDT
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Description of problem:
When attempting to mount the cdrom on a Compaq DL360G2, the error shown below
is returned, and machine hangs.
Serverworks OSB4 in impossible state. Disable UDMA or if you are using Seagate
then try switching disk types on this controller. Please report this event to
OSB4: Continuing might cause corruption
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.mount /dev/cdrom /mnt/cdrom
Actual Results: Machine Hangs
Expected Results: CDROM mounts.
Sent copy of bug report to email@example.com
We are seeing this same error. When was this error first reported?
I first saw this problem Thursday, 23 May.
We disabled the UDMA on the dev pointing to our CD-ROM (i.e. hda) using the
hdparm -d0 /dev/hda
Our HDD was mounted to /dev/cciss/c0d0 as would all HDD on a DL360_g2 system.
When we ran some test that mount and umount the cdrom we no longer saw this
error. Disabling UDMA is a workaround for this error. Try this to see if it
probides a workaround for your issue. There is still an issue, prehaps in the
however dma is supposed to be disabled by default already in 7.3.... (for cdrom
drives that is)
DMA was not disabled by default in 7.3 on this system
On tc3100 (HP NetServer) + RH7.3 have similar problem.
After some research on web, I found following patch in the
kernel mailing list.
I hope next RedHat beta (limbo2) will include this patch.
dma is off by default for all cdroms (initscripts does this), but please do test