Re: [ovirt-users] Adding FCP - Request for comments

From: "Daniel Helgenberger" <daniel.helgenberger(a)m-box.de&gt; To: "Fábio Coelho" <fabio.coelho(a)jfsc.jus.br&gt;, "users" <Users(a)ovirt.org&gt; Sent: Wednesday, May 20, 2015 8:46:01 PM Subject: Re: [ovirt-users] Adding FCP - Request for comments On 20.05.2015 19:10, Fábio Coelho wrote: Hello Fabio, > Thoughts about Adding Storage Luns > > As I am new here, I would appreciate some advice about some actions that I > intend to perform, please read. > > I have added a LUN to my cluster and, for that task, I had to restart every > node > of it. There was no LUNs before, multipathd was stopped and multipath.conf > inexisted. I was able to log in and manually configure multipath.conf, a > simple > multipathd start was not enough. In theory this should have been enough. What puzzles me: Until now host-deploy always activated multipathd and writes a multipath.conf. Here I strongly recommend to blacklist everything and then only white listing your vendors. Otherwise your error logs fill up and you cannot connect any USB stick to the host any more ;) Then, add RHEV PRIVATE to the second line otherwise it will be overwritten on every host deploy run. # RHEV PRIVATE blacklist { device { vendor "*" product "*" } }

After activating multipathd and editing multipath.conf to your needs you would actually need to run the 'multipath' command to create the paths. [1] Sometimes you need to rescan the LUNs, though, esp. if you changed sizes after activating them. > > If this wasn't enough, my double NetAPP ( through an Hitachi ) provided me > with > a not so empty brand new LUN, and the task to add the FCP failed to point > this. > Trusting my double, I spent some precious time searching for different > problems, > until receiving some guidance and do a simple dd if=/dev/zero to the > initial > blocks of the LUN. IMHO you need to initialize the lun with a partition table at least (parted). dd will do also. > > Consulting the documentation > ( http://www.ovirt.org/OVirt_Administration_Guide#Adding_FCP_Storage ) for > this > matters, was not of any help. > > So, my questions: > > This is the intended behavior? Should I open a ticket? > > Should I add a note to documentation to point such behavior? ( i'm about to > ) > I think this is not ovirts part but rather dm-multipath. My best guess would be a configuration error on your part? [1] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/... > > Cheers, > > by qoelheX > > > Aviso Legal > > A informação contida neste e-mail e em seus anexos pode ser restrita, sendo > o > emitente deste responsável por seu conteúdo e endereçamento. Se você não > for a > pessoa autorizada a receber esta mensagem e tendo recebido a mesma por > engano, > favor apagá-la imediatamente. A JFSC considera opiniões, conclusões e > outras > informações não oficiais de responsabilidade do usuário deste serviço. > -- Daniel Helgenberger m box bewegtbild GmbH P: +49/30/2408781-22 F: +49/30/2408781-10 ACKERSTR. 19 D-10115 BERLIN www.m-box.de www.monkeymen.tv Geschäftsführer: Martin Retschitzegger / Michaela Göllner Handeslregister: Amtsgericht Charlottenburg / HRB 112767 _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users