On 22.05.2015 21:08, Nir Soffer wrote:
----- 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. What can I add?
Vdsm is depending on the defaults set in the "defaults" section.
I just looked; seems to me this is the default part vdsm is needing? defaults { polling_interval 5 no_path_retry fail user_friendly_names no flush_on_last_del yes fast_io_fail_tmo 5 dev_loss_tmo 30 max_fds 4096 } The problem is there is no blacklisting at all in the default multipath.conf - at least not in mine. I know this is a hard thing to do for a general version of the file witch works for anyone. As for my part I have only very specific devices / vendors I want to have in my multipah.conf; so I blacklist everything and later on add blacklist exceptions like: blacklist_exceptions { device { vendor "IFT" product "*" } } Witch IMHO is (was?) since best practice a long time ago when I created my configs.
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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-- 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