[rhelv6-list] Partition disappeared?

[Janne Blomqvist]

On 2012-09-17T17:56:44 EEST, Bryan J Smith wrote:
> On Mon, Sep 17, 2012 at 4:12 AM, Janne Blomqvist
> <Janne.Blomqvist at aalto.fi> wrote:
>> 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).
>
> Are there any references to the partition under the tree /dev/disk?

Under /dev/disk/by-uuid there is

f430afb7-6da6-45c6-a15f-95d010fed1f9 -> ../../sda1

but that is a dangling symlink. For comparison, links to /dev/sda2 are 
found at

dev/disk/by-id/scsi-3600508b1001ca26eb450917ecf4f6567-part2 -> 
../../sda2
/dev/disk/by-id/wwn-0x600508b1001ca26eb450917ecf4f6567-part2 -> 
../../sda2
/dev/disk/by-path/pci-0000:0c:00.0-scsi-0:0:0:1-part2 -> ../../sda2

(There is no link to sda2 under by-uuid/, maybe because sda2 holds an 
LVM volume.)

> I'm curious here why the "Model" is listed as ...
>    "HP LOGICAL VOLUME"

Hmm, what can I say.. The controller is a HP Smart Array P410i, a 
"standard" raid controller that HP ships on a lot of their servers. 
It's controlled by the "hpsa" driver, in older kernel versions the 
"cciss" driver. The controller itself has some rudimentary volume 
management functionality, maybe that's why it calls itself "HP LOGICAL 
VOLUME".

> I'm curious if there is some sort of vendor driver/modification in the
> initrd,

The HP Proliant Support Pack (PSP) is installed, which contains some 
updated drivers (yes, including hpsa), anything particular to look out 
for?

(That being said, since I cannot access /boot it's difficult to say 
whether initramfs has been modified..)

> or some other udev, dm-mpio or other filtering going on (also
> possibly in the initrd).

Yes, we use dm-multipath for some FC luns, but the blacklisting there 
should only affect the creation of the dm-mp devices, no?


--
Janne Blomqvist