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Re: mpath



what means "multipath -ll" ?

On 01.07.2010, at 08:44, madunix wrote:

> I see multiple boot labels, why this? Can I enable one of them. !!!
> 
> #blkid
> 
> /dev/mapper/VolGroup00-LogVol01: TYPE="swap"
> 
> /dev/mapper/VolGroup00-LogVol00: UUID="6e16f4c9-8a7a-4f4d-a1b5-a07c0f8df665"
> TYPE="ext3"
> 
> /dev/mapper/mpath0p1: LABEL="/boot"
> UUID="08f12bcd-3ff2-4e3b-b305-32977fa6ebea" TYPE="ext3"
> 
> /dev/sda1: LABEL="/boot" UUID="08f12bcd-3ff2-4e3b-b305-32977fa6ebea"
> TYPE="ext3"
> 
> /dev/VolGroup00/LogVol01: TYPE="swap"
> 
> /dev/sdb1: LABEL="/boot" UUID="08f12bcd-3ff2-4e3b-b305-32977fa6ebea"
> TYPE="ext3"
> 
> [root intra-blade ~]# rpm -aq device-mapper-*
> 
> device-mapper-multipath-0.4.7-34.el5_5.1
> 
> device-mapper-event-1.02.39-1.el5_5.2
> 
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> 
> On Sun, Jun 20, 2010 at 8:22 PM, Thomas von Steiger <
> thomas vonsteiger bluewin ch> wrote:
> 
>> If you try to boot from replicated san lun then you have a new wwid for
>> this lun because it's not the same lun where you install rhel5.
>> You need to hacketihack initrd with the new wwid from the repliacted lun i
>> think inside the init script.
>> Then you can make a new entry in grub.conf to boot from the replicated lun.
>> 
>> Thomas
>> 
>> On 18.06.2010, at 20:32, madunix wrote:
>> 
>>> I booted lately several RHEL5.1 Bladecenter servers with multipath, the
>>> multipath has been implemented typing mpath during the booting
>> installation
>>> from CD.
>>> For our disaster recovery, we found that the linux rhel5 system wont boot
>> up
>>> from replicated SAN LUN using device mapper multipath ... its reporting
>>> kernel panic and cant e2fsck files system to continue ctrl D and type
>> root
>>> password ...etc
>>> in order to boot the system we remounted in read/write mode and edit
>>> /etc/fstab then removed the mpath dev from boot disk, the system was able
>> to
>>> boot
>>> 
>>> madunix
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>> 
>> 
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