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...
Best regards from/Med vänliga hälsningar från
Johan Kragsterman
Capvert
Johan Kragsterman
2016-Jun-12 08:44 UTC
[libvirt-users] Ang: vhba and storage pool creation
<font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2"><div><br><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2">HI again!</font></div><div><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2"><br></font></div><div><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2">I do have another question as well. See in the end.</font></div><br><font color="#990099">-----libvirt-users-bounces@redhat.com skrev: -----</font><div class="iNotesHistory" style="padding-left:5px;"><div style="padding-right:0px;padding-left:5px;border-left:solid black 2px;">Till: libvirt-users@redhat.com<br>Från: Johan Kragsterman <johan.kragsterman@capvert.se><br>Sänt av: libvirt-users-bounces@redhat.com<br>Datum: 2016-06-12 08:30<br>Ärende: [libvirt-users] vhba and storage pool creation<br><br><div><font face="Courier New,Courier,monospace" size="3">Hi!<br><br><br>Got a couple of storage questions here.<br><br>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.<br><br>So, my questions here:<br><br>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.<br><br>My next step would be to make it persistent, and then its this storage pool creation I've seen.<br><br>Though some things are not clear to me. This is what the xml file looks like in the documentation:<br><br><br><pool type='scsi'><br> <name>poolvhba0</name><br> <source><br> <adapter type='fc_host' wwnn='20000000c9831b4b' wwpn='10000000c9831b4b'/><br> </source><br> <target><br> <path>/dev/disk/by-path</path><br> <permissions><br> <mode>0700</mode><br> <owner>0</owner><br> <group>0</group><br> </permissions><br> </target><br> </pool><br><br><br><br>So there are a few of these things that are unclear to me:<br><br>* It seems like I should NOT configure a vhba in advance, but this is the process that will configure the vhba for me?<br>* It also seems like the wwnn and wwpn set here are the ones that the vhba will use, not the parent hba?<br>* 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:<br><br><source><br> <adapter type='fc_host' parent='scsi_host5' wwnn='20000000c9831b4b' wwpn='10000000c9831b4b'/><br> </source><br><br>* So, are these wwpn and wwnn's from parent or vhba?<br>* 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...<br>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???<br><br>That would make sense, but also be a bit complicated to use...<br><br><br><br><br>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?</font></div><div><font face="Courier New,Courier,monospace" size="3">I've seen there are multipath pools, but these doesn't seem to be the right way to go...?<br><br><br><br><br>Best regards from/Med vänliga hälsningar från<br><br>Johan Kragsterman<br><br>Capvert<br><br><br>_______________________________________________<br>libvirt-users mailing list<br>libvirt-users@redhat.com<br><a href="https://www.redhat.com/mailman/listinfo/libvirt-users">https://www.redhat.com/mailman/listinfo/libvirt-users</a><br><br></font></div></johan.kragsterman@capvert.se></div></div><div></div></font>
Johan Kragsterman
2016-Jun-12 11:15 UTC
[libvirt-users] Ang: Ang: vhba and storage pool creation
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. -----libvirt-users-bounces@redhat.com skrev: ----- Till: libvirt-users@redhat.com Från: Johan Kragsterman Sänt av: libvirt-users-bounces@redhat.com 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. -----libvirt-users-bounces@redhat.com skrev: ----- Till: libvirt-users@redhat.com Från: Johan Kragsterman Sänt av: libvirt-users-bounces@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 _______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users _______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users
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