Re: [Users] iscsi mpio

From: "Jonathan Horne" <jhorne(a)skopos.us&gt; To: "Vered Volansky" <vered(a)redhat.com&gt; Sent: Monday, December 10, 2012 4:24:05 PM Subject: Re: [Users] iscsi mpio Im using the ovirt node which is a prebuilt appliance-like version of ovirt. It is highly customized, and is not open to alteration. (to do so would be quite a bit of work). JONATHAN HORNE | Systems Administrator | Skopos Web <http://www.skopos.us/> e: jhorne(a)skopos.us t: (972) 520-5042 f: (214) 520-5079 On 12/10/12 6:46 AM, "Vered Volansky" <vered(a)redhat.com&gt; wrote: >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(a)skopos.us&gt; >> To: users(a)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@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@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(a)ovido.at&gt; 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(a)ovido.at >> >============================================ >> > >> > >> >On Fri, 2012-12-07 at 13:55 +0000, Jonathan Horne wrote: >> >> >> >> >> >> From: Jonathan Horne <jhorne(a)skopos.us&gt; >> >> Date: Thursday, December 6, 2012 1:04 PM >> >> To: users <users(a)ovirt.org&gt; >> >> 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 >> >> >> >> >> >> >>______________________________________________________________________ >> >> This is a PRIVATE message. 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NOTE: Regardless of content, this e-mail >> shall >> not operate to bind SKOPOS to any order or other contract unless >> pursuant to explicit written agreement or government initiative >> expressly permitting the use of e-mail for such purpose. >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> ________________________________ This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind SKOPOS to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose.