[Users] iscsi mpio

Mon Dec 10 12:46:21 UTC 2012

Hi Jonathan,

I'm trying to understand the context for your problem.

As I understand it, your problem stems from the fact that you're working on a Read Only fs, long before the multipath issue.
So you have root permissions on an RO fs?
How come? Why is it RO to begin with?
Are you working on RHEVM?
Which OS, version?

Maybe we can be of more help if we better understand the context.

Thanks,
Vered

----- Original Message -----
> From: "Jonathan Horne" <jhorne at skopos.us>
> To: users at ovirt.org
> Sent: Friday, December 7, 2012 7:09:08 PM
> Subject: Re: [Users] iscsi mpio
> 
> 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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