AW: Problems using multipath _ md _ lvm with IBM Series I and DS8000

Wed Mar 12 14:23:11 UTC 2008

Mmh, this bugfix doesn't describe our problem correctly. It's my fault i described our problem not correctly. The problem is that after initialize the multipath-device md gives an error like:

  Vendor: IBM       Model: 2107900           Rev: .698
  Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sdcj: 134217728 512-byte hdwr sectors (68719 MB)
sdcj: Write Protect is off
SCSI device sdcj: drive cache: write back
SCSI device sdcj: 134217728 512-byte hdwr sectors (68719 MB)
sdcj: Write Protect is off
SCSI device sdcj: drive cache: write back
 sdcj:
sd 9:0:0:10: Attached scsi disk sdcj
Loading dm-mod.ko module
device-mapper: ioctl: 4.11.0-ioctl (2006-09-14) initialised: dm-devel at redhat.com
Loading dm-mirror.ko module
Loading dm-zero.ko module
Loading dm-snapshot.ko module
Loading dm-multipath.ko module
device-mapper: multipath: version 1.0.5 loaded
Loading dm-round-robin.ko module
device-mapper: multipath round-robin: version 1.0.0 loaded
Waiting for driver initialization.
Creating multipath devices
Scanning and configuring dmraid supported devices
md: Autodetecting RAID arrays.
md: could not bd_claim sdc2.
md: could not bd_claim sdc3.
md: could not bd_claim sdn2.
md: could not bd_claim sdn3.
md: could not bd_claim sdw2.
md: could not bd_claim sdw3.

...this seems that the devices are in use ...is this correct?

-----Ursprüngliche Nachricht-----
Von: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] Im Auftrag von Hartung, Christopher
Gesendet: Mittwoch, 12. März 2008 15:07
An: General Red Hat Linux discussion list
Betreff: AW: Problems using multipath _ md _ lvm with IBM Series I and DS8000

hi George,

we actually use the kernel of Redhat 5 u1  which is provided in the iso-image from rhn.redhat.com (2.6.18-53). Thx for the info about the fix! Maybe this could work!

so long 
chris

-----Ursprüngliche Nachricht-----
Von: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] Im Auftrag von George Magklaras
Gesendet: Mittwoch, 12. März 2008 14:21
An: General Red Hat Linux discussion list
Betreff: Re: Problems using multipath _ md _ lvm with IBM Series I and DS8000

Hmm,

I have seen something on a recent RHN release for a new kernel fix. It 
came in yesterday and for what you describe, it looks as if your 
device-mapper-multipath module code is causing the problem. Do you have 
the problem with the latest new kernel? (see below)

GM

-- 
--
George Magklaras

Senior Computer Systems Engineer/UNIX Systems Administrator
EMBnet Technical Management Board
The Biotechnology Centre of Oslo,
University of Oslo
http://folk.uio.no/georgios

Bug Fix Advisory - RHBA-2008:0128-3
------------------------------------------------------------------------------
Summary:
device-mapper-multipath bug fix update

Updated device-mapper-multipath packages that fix a bug are now available.

Description:
The device-mapper-multipath packages provide tools to manage multipath
devices by giving the device-mapper multipath kernel module instructions on
what to do, as well as by managing the creation and removal of partitions
for device-mapper devices.

These updated device-mapper-multipath packages fix a bug that occurs when
running multipath on a device containing the root filesystem. On such
systems, multiple path faults and recovery events could result in the
multipathed host becoming unresponsive.

In order to bring a failed path back online, some multipath devices require
a priority callout program. These programs are located on a ramfs; however,
they were not statically compiled, and needed libraries that were located
on the root filesystem. To fix this, all priority callouts are now
statically compiled.

Users are advised to upgrade to these updated device-mapper-multipath
packages, which resolve this issue.

Hartung, Christopher wrote:
> Hi @all,
> 
> We've problem installing redhat 5.1 on IBM Power System i 570 native.
> Our configuration will look like this:
> 
> DS8000_1	=> LUNA	=>	mpath (device-mapper)	=>	PrepBoot
> (8 MB), /boot (100 MB), / (rest)
> DS8000_2	=> LUNB	=>	mpath (device-mapper)	=>	PrepBoot
> (8 MB), /boot (100 MB), / (rest)
> 
> Mirroring:
> 		=> /boot	=> MD0
> 		=> /		=> MD1		=> lvm
> 
> so we've this layers: mpath - md - lvm
> 
> the installation of redhat works fine. But after starting the
> initprocess of our new system and initialization of the multipath
> devices the system can't found any md devices and in effect of this the
> system can't find the lvm configuration and gets a kernel panic because
> the root filesystem isn't found. 
> 
> We found many entrys in mailinglists to configure an new initramdisk but
> not really explained in detail. The questions are, would a new init
> solve our problem (if so, what must we do?) and would this configuration
> above work in this constellation?
> 
> Thanks for your answer in advance
> 
> So long,
> 
> christopher
> 

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