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тАО08-29-2007 11:03 PM
тАО08-29-2007 11:03 PM
partition table disappears
Hi all,
We have the following problem.
Setup:
RedHat 4.4 ia64 Itanium (rx2620).
EVA4000
Oracle 10G + OCFS2
We created and presented a Vdisk to 2 hosts.
Partitioned the Vdisk on host 1 (using fdisk option 'n')
Formatted the partition for OCFS2 (using ocfs2console).
Mounted the filesystem on host 1.
Mounted the filesystem on host 2.
Everything worked fine.
We rebooted host 1.
After that host 1 cannot mount the filesystem anymore, giving error:
"mount.ocfs2: Device name specified was not found while opening device /dev/sdi1"
It turns out that the partition table seems to be gone:
fdisk -l /dev/sdi
Disk /dev/sdi: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
We didn't reboot host 2 and the disk is still mounted and accessible from host 2, even though fdisk -l doesn't show a partition table on host 2 either.
I don't know what went wrong here.
Has anyone ever experienced a similar problem?
Thanks,
Martijn.
We have the following problem.
Setup:
RedHat 4.4 ia64 Itanium (rx2620).
EVA4000
Oracle 10G + OCFS2
We created and presented a Vdisk to 2 hosts.
Partitioned the Vdisk on host 1 (using fdisk option 'n')
Formatted the partition for OCFS2 (using ocfs2console).
Mounted the filesystem on host 1.
Mounted the filesystem on host 2.
Everything worked fine.
We rebooted host 1.
After that host 1 cannot mount the filesystem anymore, giving error:
"mount.ocfs2: Device name specified was not found while opening device /dev/sdi1"
It turns out that the partition table seems to be gone:
fdisk -l /dev/sdi
Disk /dev/sdi: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
We didn't reboot host 2 and the disk is still mounted and accessible from host 2, even though fdisk -l doesn't show a partition table on host 2 either.
I don't know what went wrong here.
Has anyone ever experienced a similar problem?
Thanks,
Martijn.
3 REPLIES 3
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тАО08-29-2007 11:18 PM
тАО08-29-2007 11:18 PM
Re: partition table disappears
Shalom,
I ran into a very similar problem with ocfs2 hosted on a SAN using emulex cards.
I was forced to build a new initrd file with the emulex hba cards built into modeprobe.conf
It is best to build the fdisk with the second node shut down. After build, run partprobe, and boot to see if it remains in the fdisk -l output.
SEP
I ran into a very similar problem with ocfs2 hosted on a SAN using emulex cards.
I was forced to build a new initrd file with the emulex hba cards built into modeprobe.conf
It is best to build the fdisk with the second node shut down. After build, run partprobe, and boot to see if it remains in the fdisk -l output.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО08-29-2007 11:55 PM
тАО08-29-2007 11:55 PM
Re: partition table disappears
Thanks for your fast reply.
We're using Qlogic hba's.
Were you able to access the partition table again after rebuilding the initrd?
Regards,
Martijn.
We're using Qlogic hba's.
Were you able to access the partition table again after rebuilding the initrd?
Regards,
Martijn.
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тАО09-04-2007 04:56 AM
тАО09-04-2007 04:56 AM
Re: partition table disappears
I was involved in an issue once where a similar situation had occurred. The customer was running RHEL3 w/ Oracle 9iRac and had configured one of the drives as an OCFS 'raw' partiton. In this configuration, there was no 'partition table' as OCFS was given direct access to the device. After a reboot for periodic maintenance the OCFS drive became unusuable.
Oracle's position on this issue was that raw device access to a disk with OCFS was problematic and that OCFS was more reliable with partition table. In the OCFS config, the customer needed to specify a device such as /dev/sda1 as opposed to the block device /dev/sda.
Once the customer configured OCFS in this manner, they had no further data corruption...
Oracle's position on this issue was that raw device access to a disk with OCFS was problematic and that OCFS was more reliable with partition table. In the OCFS config, the customer needed to specify a device such as /dev/sda1 as opposed to the block device /dev/sda.
Once the customer configured OCFS in this manner, they had no further data corruption...
Necessary questions: Why? What? How? When?
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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