[rhelv6-list] Partition disappeared?

[Janne Blomqvist]

On 2012-09-14T23:47:03 EEST, Collins, Kevin [BEELINE] wrote:
> So, are you saying that the device file /dev/sda1 doesn't exist or that /dev/sda1 is not getting mounted? If it is the latter case, what happens when you try to mount it?

I'm saying that /dev/sda1 doesn't exist. (In fstab it's mounted by UUID 
as RHEL6 sets it up out-of-the-box, but it doesn't find the partition 
that way either).

>
> Thanks,
>
> Kevin
>
> -----Original Message-----
> From: rhelv6-list-bounces at redhat.com [mailto:rhelv6-list-bounces at redhat.com] On Behalf Of Blomqvist Janne
> Sent: Wednesday, September 12, 2012 1:02 AM
> To: Red Hat Enterprise Linux 6 (Santiago) discussion mailing-list
> Subject: [rhelv6-list] Partition disappeared?
>
> Hi,
>
> I'm seeing a strange issue where, per dmesg, a partition is found when the kernel is booted, but later it has disappeared and by the time /etc/fstab is parsed and filesystems mounted it cannot be found and bootup thus fails.
>
> >From dmesg:
>
> sd 0:0:0:1: [sda] 143305920 512-byte logical blocks: (73.3 GB/68.3 GiB)
> sd 0:0:0:1: [sda] Write Protect is off
> sd 0:0:0:1: [sda] Mode Sense: 6b 00 00 08
> sd 0:0:0:1: [sda] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
>   sda: sda1 sda2
>
> Later on sda1 has disappeared (e.g., /dev/sda1 doesn't exist), although with parted I can still find it:
>
> GNU Parted 2.1
> Using /dev/sda
> Welcome to GNU Parted! Type 'help' to view a list of commands.
> (parted) p
> Model: HP LOGICAL VOLUME (scsi)
> Disk /dev/sda: 73.4GB
> Sector size (logical/physical): 512B/512B
> Partition Table: msdos
>
> Number  Start   End     Size    Type     File system  Flags
>   1      1049kB  525MB   524MB   primary  ext4         boot
>   2      525MB   73.4GB  72.8GB  primary               lvm
>
>
> I haven't found any messages anywhere wrt. sda1 disappearing. As you can deduce from the above, the partition in question is /boot. So the partition itself seems Ok, considering grub can read and boot the kernel there. I just cannot access it from the booted system (commenting out the /boot entry in fstab allows the system to boot successfully).
>
> The system in question is currently running RHEL 6.3, originally it was installed as 6.x and upgraded over time.
>
> Has anyone seen something similar, or better yet, seen and fixed it?
>
>
> --
> Janne Blomqvist
>
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--
Janne Blomqvist