[ovirt-users] Adding FCP - Request for comments

[Nir Soffer]

----- Original Message -----
> From: "Daniel Helgenberger" <daniel.helgenberger at m-box.de>
> To: "Fábio Coelho" <fabio.coelho at jfsc.jus.br>, "users" <Users at ovirt.org>
> 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 "*"
>          }
> }

This is bad idea. If you want to blacklist all devices, you can add this to 
vdsm generated configuration.

Vdsm is depending on the defaults set in the "defaults" section.

> 
> 
> 
> 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/html-single/DM_Multipath/#mpio_setup
> >
> > Cheers,
> >
> > by qoelheX
> >
> >
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> >
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> >
> 
> --
> Daniel Helgenberger
> m box bewegtbild GmbH
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