6:15 a.m.
Hi again, again...!
Additional question AGAIN about multipath: If I add both luns(same multipath lu) to the
config, perhaps is it so, that the guest VM will discover that it is the same device, and
use them to configure an multipath device? I mean if it is a guest that has multipath
capabilities, like centos7.
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Till: libvirt-users(a)redhat.com
Från: Johan Kragsterman
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Datum: 2016-06-12 08:47
Ärende: [libvirt-users] Ang: vhba and storage pool creation
HI again!
I do have another question as well. See in the end.
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Till: libvirt-users(a)redhat.com
Från: Johan Kragsterman
Sänt av: libvirt-users-bounces(a)redhat.com
Datum: 2016-06-12 08:30
Ärende: [libvirt-users] vhba and storage pool creation
Hi!
Got a couple of storage questions here.
I'm a storage guy, running a new project, and just started with libvirt, but have been
using qemu/kvm on other platforms before, as well as oVirt.
So, my questions here:
I started with creating a vhba, and that went fine, I could see it on the storage side
logging in to the target with its wwn.
My next step would be to make it persistent, and then its this storage pool creation
I've seen.
Though some things are not clear to me. This is what the xml file looks like in the
documentation:
<pool type='scsi'>
<name>poolvhba0</name>
<source>
<adapter type='fc_host' wwnn='20000000c9831b4b'
wwpn='10000000c9831b4b'/>
</source>
<target>
<path>/dev/disk/by-path</path>
<permissions>
<mode>0700</mode>
<owner>0</owner>
<group>0</group>
</permissions>
</target>
</pool>
So there are a few of these things that are unclear to me:
* It seems like I should NOT configure a vhba in advance, but this is the process that
will configure the vhba for me?
* It also seems like the wwnn and wwpn set here are the ones that the vhba will use, not
the parent hba?
* There is an option of setting the parent here as well, which I will need for some
resons, but it is unclear to me whether the wwnn and wwpn's are from the parent or the
vhba? Looks like this in documentation:
<source>
<adapter type='fc_host' parent='scsi_host5'
wwnn='20000000c9831b4b' wwpn='10000000c9831b4b'/>
</source>
* So, are these wwpn and wwnn's from parent or vhba?
* Lastly, the path: In the xml file it says /dev/disk/by-path...but I have no path...?
Since I have not yet configured the vhba, I can not have a path? I can not map a lun to
the vhba before I have a vhba...
Or should I create a non persistent vhba, map a lun to it, and then source that path, use
the wwpn and wwnn from that vhba in the scsi pool creation???
That would make sense, but also be a bit complicated to use...
The other question regards multipath. These luns are provided by an Fc SAN, so they're
of coarse multipath luns. How do I set the /dev/disk/by-path for these?
I've seen there are multipath pools, but these doesn't seem to be the right way to
go...?
Best regards from/Med vänliga hälsningar från
Johan Kragsterman
Capvert
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