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
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