[Users] iscsi mpio

Fri Dec 7 17:09:08 UTC 2012

Im using a Equallogic iscsi SAN, and it has a special multi path driver
because it uses a virtual IP for the initiator to log into, and the actual
traffic ip addresses are not exposed to the initiator.

I tried to install the rpm but as far as i can get is:

[root at vmnode02 x86_64]# rpm -Uvh
equallogic-host-tools-1.2.0-2.el6.x86_64.rpm --nodeps
warning: equallogic-host-tools-1.2.0-2.el6.x86_64.rpm: Header V4 DSA/SHA1
Signature, key ID 84fd3ef3: NOKEY
error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Read-only
file system)

Is there a way to unlock the file system so i can try to install and
configure this driver?

This is the current output of multipath -ll on my node:

[root at vmnode02 x86_64]# multipath -ll
36019cb3131d6f276d80a45bb6501f0c9 dm-10
size=500G features='0' hwhandler='0' wp=rw
36001e4f03dd42300183eaac404afd5ce dm-0 DELL,PERC 6/i
size=279G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  `- 2:2:0:0 sda 8:0 active ready running

The EQ san does show only 1 single tcp connection into the LUN, so i know
its not multipathing at this time.  This will be a huge downer if i have
to go to production without multi path support.

Is there anything i can do here?

On 12/7/12 8:42 AM, "René Koch (ovido)" <r.koch at ovido.at> wrote:

>Hi,
>
>I can give you some information on multipathing on RHEV-H, as I don't
>have ovirt-node installed at the moment.
>
>Multipath packages are installed on the hypervisor, but vdsm overwrites
>multipath.conf.
>
>To prevent this you have to set the following tags:
># RHEV REVISION 0.7
># RHEV PRIVATE
>
>Search for MPATH_CONF_TAG in multipath.py file to get correct RHEV
>REVISION number.
>
>After changing multipath.conf to fit your needs make it persistent for
>reboots:
># persist /etc/multipath.conf
>
>
>You can check multipath status with:
>
># multipath -ll
>mpathb (2222b00015521f5d4) dm-0 Intel,Multi-Flex
>size=96G features='0' hwhandler='0' wp=rw
>|-+- policy='round-robin 0' prio=50 status=active
>| `- 0:0:0:1 sdb 8:16 active ready running
>mpatha (222140001553601d1) dm-1 Intel,Multi-Flex
>size=20G features='0' hwhandler='0' wp=rw
>|-+- policy='round-robin 0' prio=50 status=active
>| `- 0:0:0:0 sda 8:0  active ready running
>
>I hope this helps.
>Don't really know if the tags are the same in oVirt, as I don't have a
>working oVirt setup at the moment.
>
>
>--
>Best Regards,
>
>DI (FH) René Koch
>Senior Solution Architect
>
>============================================
>ovido gmbh - "Das Linux Systemhaus"
>Brünner Straße 163, A-1210 Wien
>
>Phone:   +43 720 / 530 670
>Mobile:  +43 660 / 512 21 31
>E-Mail:  r.koch at ovido.at
>============================================
>
>
>On Fri, 2012-12-07 at 13:55 +0000, Jonathan Horne wrote:
>>
>>
>> From: Jonathan Horne <jhorne at skopos.us>
>> Date: Thursday, December 6, 2012 1:04 PM
>> To: users <users at ovirt.org>
>> Subject: [Users] iscsi mpio
>>
>>
>>
>> Hello,
>>
>>
>> I just rebooted my iscsi SAN and the ovirt node 2.5.5fc17 did not
>> enjoy that one bit.   Does ovirt node support multi path i/o?  Any
>> information about this would be greatly appreciated.
>>
>>
>> Thanks,
>> jonathan
>>
>>
>>
>>
>>
>>
>> I attempted to install the multi path driver on node 2.5.5-0.fc17, but
>> the file system is read only and i can't make changes.
>>
>>
>> I really need to find out about multipathing, because yesterday i
>> upgraded the firmware on my iscsi SAN yesterday, and one of my nodes
>> freaked out and rebooted (oddly, the other 2 didn't).  In understand
>> there may already be multi path configured within the node, but how do
>> i verify it with my set up?
>>
>>
>> Thanks,
>> jonathan
>>
>>
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