[Users] Question on configuring local storage on oVirt Node
Hi folks - I hope this is the right place for this question; I have tried to Google this but in general haven't been able to find much in the way of docs outside of the main installation guide. In aforementioned guide there are instructions for configuring local-only storage on oVirt Node machines: "On a oVirt Node host, set up the path for the local storage as /data/images. This is the only path permitted for a oVirt Node. On a Red Hat Enterprise Linux host other paths are supported but the directories to support it must be manually created first." I'm probably missing something, but it's unclear to me how to create this local storage mountpoint on that host. (I don't see anything in the Node TUI.) I tried simply specifying "/data/images" in the hopes that it was automatically created, but the Admin console just spun indefinitely (eventually refreshing the page revealed that the store was note created). I'm currently rebuilding that Node as a F16+VDSM box instead -- so I can get in there and set this up manually (is there a way to get into schell on oVirt Nodes and mess with the [F16-based?] OS?) Any guidance greatly appreciated. Thanks, Hans
On Thu, 2012-03-22 at 08:38 -0400, Hans Lellelid wrote:
Hi folks -
I hope this is the right place for this question; I have tried to Google this but in general haven't been able to find much in the way of docs outside of the main installation guide.
In aforementioned guide there are instructions for configuring local-only storage on oVirt Node machines:
"On a oVirt Node host, set up the path for the local storage as /data/images. This is the only path permitted for a oVirt Node. On a Red Hat Enterprise Linux host other paths are supported but the directories to support it must be manually created first."
I'm probably missing something, but it's unclear to me how to create this local storage mountpoint on that host. (I don't see anything in the Node TUI.) I tried simply specifying "/data/images" in the hopes that it was automatically created, but the Admin console just spun indefinitely (eventually refreshing the page revealed that the store was note created).
I'm currently rebuilding that Node as a F16+VDSM box instead -- so I can get in there and set this up manually (is there a way to get into schell on oVirt Nodes and mess with the [F16-based?] OS?)
You can drop to the shell using F2 and create the directory that way. IMO, since we restrict the location you can create a local data store, we should automatically create that when configuring the local datastore. We can't actually pre-create the directory since it's a mounted filesystem, but it might be possible to do it at installation or boot time. The right place is in vdsm when it's trying to create the local data store. Dan, is this possible to do? Isn't /data2/images also a possible location? Thanks Mike
Any guidance greatly appreciated.
Thanks, Hans _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
I'm probably missing something, but it's unclear to me how to create this local storage mountpoint on that host. (I don't see anything in the Node TUI.) I tried simply specifying "/data/images" in the hopes that it was automatically created, but the Admin console just spun indefinitely (eventually refreshing the page revealed that the store was note created).
I'm currently rebuilding that Node as a F16+VDSM box instead -- so I can get in there and set this up manually (is there a way to get into schell on oVirt Nodes and mess with the [F16-based?] OS?)
You can drop to the shell using F2 and create the directory that way.
Thanks, that's really helpful. I'm sure it was mentioned somewhere, but I was trying different consoles with "root" etc. and unsure on how to get to the terminal.
IMO, since we restrict the location you can create a local data store, we should automatically create that when configuring the local datastore.
We can't actually pre-create the directory since it's a mounted filesystem, but it might be possible to do it at installation or boot time. The right place is in vdsm when it's trying to create the local data store.
So, after initially attempting to just "create" the directory and being told it was a read-only filesystem, I did a little more investigation and realized that the "Data" volume (in /dev/HostVG) was simply not mounted. I mounted this with the command: mount /dev/HostVG/Data /data And now I have a /data/images directory (as well as /data/core). I'm not entirely sure why this wasn't mounted since I see it in /etc/fstab. In fact, when I discovered it was in /etc/fstab, I tried just mount /data And that also worked just fine. So puzzled that thsi was not mounted when the system booted up. Maybe I missed an error message, but dmesg isn't saying anything obvious (not sure if that's where I'd see mount errors or not). Maybe this is a known issue. Thanks again for the help -- this definitely got me moving in the right direction. Hopefully I'm moments away from being able to get that first VM running. Thanks, Hans
On Thu, 2012-03-22 at 15:43 -0400, Hans Lellelid wrote:
> I'm probably missing something, but it's unclear to me how to create > this local storage mountpoint on that host. (I don't see anything in > the Node TUI.) I tried simply specifying "/data/images" in the hopes > that it was automatically created, but the Admin console just spun > indefinitely (eventually refreshing the page revealed that the store > was note created). > > > I'm currently rebuilding that Node as a F16+VDSM box instead -- so I > can get in there and set this up manually (is there a way to get into > schell on oVirt Nodes and mess with the [F16-based?] OS?)
You can drop to the shell using F2 and create the directory that way.
Thanks, that's really helpful. I'm sure it was mentioned somewhere, but I was trying different consoles with "root" etc. and unsure on how to get to the terminal.
IMO, since we restrict the location you can create a local data store, we should automatically create that when configuring the local datastore.
We can't actually pre-create the directory since it's a mounted filesystem, but it might be possible to do it at installation or boot time. The right place is in vdsm when it's trying to create the local data store.
So, after initially attempting to just "create" the directory and being told it was a read-only filesystem, I did a little more investigation and realized that the "Data" volume (in /dev/HostVG) was simply not mounted. I mounted this with the command:
mount /dev/HostVG/Data /data
And now I have a /data/images directory (as well as /data/core). I'm not entirely sure why this wasn't mounted since I see it in /etc/fstab. In fact, when I discovered it was in /etc/fstab, I tried just
mount /data
And that also worked just fine. So puzzled that thsi was not mounted when the system booted up. Maybe I missed an error message, but dmesg isn't saying anything obvious (not sure if that's where I'd see mount errors or not). Maybe this is a known issue.
I had heard this from a couple people previously, but it always seemed to present as a one off problem. We've managed to reproduce it consistently, so it seems that it's a legitimate problem that we need to fix. Thanks Mike
Thanks again for the help -- this definitely got me moving in the right direction. Hopefully I'm moments away from being able to get that first VM running.
Thanks, Hans
participants (2)
-
Hans Lellelid -
Mike Burns