----- Original Message -----
From: "Daniel Helgenberger" <daniel.helgenberger@m-box.de> To: "Fábio Coelho" <fabio.coelho@jfsc.jus.br>, "users" <Users@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/htm...
Cheers,
by qoelheX
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