Re: [Users] RAID1 mirror on ovirt-node + engine nfs server
On 07/04/2013 07:18 PM, Jason Keltz wrote: I also have a question about the storage backend. In particular, I have a pretty powerful server that I intend to use as the NFS server, and a few servers to use as nodes. On the other hand, I don't have a powerful machine (at the moment) to use for the ovirt-engine. Would it be poor practice to run the ovirt-engine ON the NFS server? During engine setup, I see that you can setup an NFS share for ISOs from the ovirt-engine, but I don't think there's mention of just generalized storage there. I suspect it's "poor practice", but I thought I'd ask anyway. My setup will be relatively small (say, 4 nodes), and this would let me reduce 1 general server from the infrastructure (dedicated ovirt-engine). "powerful" is relative. engine doesn't need a very strong server. you can also run it in a VM which is easier to move around later / increase resources for. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [Users] RAID1 mirror on ovirt-node + engine nfs server
On 07/04/2013 12:18 PM, Jason Keltz wrote: Hi. I've been reading about ovirt, and ready to try my own experiments with it. I have two small questions.. When an ovirt-node is installed from the standard ISO, there's no mention in the documentation about setting up a RAID1 mirror for the root disk on the node. I'm sure that once I get around to working out kickstarting the node, I could easily install the raid1 mirror, but I'm just wondering why I don't see that in the default ISO. Maybe I'm just missing something. Is redundancy of the disk on the node not important? Sure, if the node goes down, I guess the VMs could be run on other nodes, but if we can prevent the node from going down in the first place, then why not? If your server has hardware raid and presents the array as a single device to oVirt Node, then it should work. If it's not true hardware raid (it generates a dmraid or mdraid device), it won't work. In general, the disk image for the node is not important. The important storage is usually shared from an external system (NFS, iSCSI, FC). Installation/Re-installation is usually very easy to do, so Raid arrays of local disks in oVirt Node was not a requirement. We may add support for this in the future (or will accept patches adding support), but it was not an important enough requirement previously. As for Engine...I'll defer that to the people who know engine better... Mike I also have a question about the storage backend. In particular, I have a pretty powerful server that I intend to use as the NFS server, and a few servers to use as nodes. On the other hand, I don't have a powerful machine (at the moment) to use for the ovirt-engine. Would it be poor practice to run the ovirt-engine ON the NFS server? During engine setup, I see that you can setup an NFS share for ISOs from the ovirt-engine, but I don't think there's mention of just generalized storage there. I suspect it's "poor practice", but I thought I'd ask anyway. My setup will be relatively small (say, 4 nodes), and this would let me reduce 1 general server from the infrastructure (dedicated ovirt-engine). Thanks! :) Jason. ps: At the moment, I am not subscribed to users - please cc: me on responses. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [Users] RAID1 mirror on ovirt-node + engine nfs server
> > From: Jason Keltz > To: users@ovirt.org > Subject: [Users] RAID1 mirror on ovirt-node + engine nfs server > Message-ID: <51d5a06e.10...@cse.yorku.ca> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi. > > I've been reading about ovirt, and ready to try my own experiments with > it. I have two small questions.. > > When an ovirt-node is installed from the standard ISO, there's no > mention in the documentation about setting up a RAID1 mirror for the > root disk on the node. I'm sure that once I get around to working out > kickstarting the node, I could easily install the raid1 mirror, but I'm > just wondering why I don't see that in the default ISO. Maybe I'm just > missing something. Is redundancy of the disk on the node not > important? Sure, if the node goes down, I guess the VMs could be run on > other nodes, but if we can prevent the node from going down in the first > place, then why not? > > Kickstarting the Node is an interesting proposition, but not one that the current image is well-suited for. Nor is support for mdraid devices, to be honest. It's something worth considering (whether btrfs redundancy or mdraid), but it's not currently implemented to my knowledge. I could be wrong about that. I also have a question about the storage backend. In particular, I have > a pretty powerful server that I intend to use as the NFS server, and a > few servers to use as nodes. On the other hand, I don't have a powerful > machine (at the moment) to use for the ovirt-engine. Would it be poor > practice to run the ovirt-engine ON the NFS server? During engine > setup, I see that you can setup an NFS share for ISOs from the > ovirt-engine, but I don't think there's mention of just generalized > storage there. I suspect it's "poor practice", but I thought I'd ask > anyway. My setup will be relatively small (say, 4 nodes), and this > would let me reduce 1 general server from the infrastructure (dedicated > ovirt-engine). > I run the engine virtualized as a guest on the NFS server. This is definitely a workable use case, especially for small environments. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[Users] RAID1 mirror on ovirt-node + engine nfs server
Hi. I've been reading about ovirt, and ready to try my own experiments with it. I have two small questions.. When an ovirt-node is installed from the standard ISO, there's no mention in the documentation about setting up a RAID1 mirror for the root disk on the node. I'm sure that once I get around to working out kickstarting the node, I could easily install the raid1 mirror, but I'm just wondering why I don't see that in the default ISO. Maybe I'm just missing something. Is redundancy of the disk on the node not important? Sure, if the node goes down, I guess the VMs could be run on other nodes, but if we can prevent the node from going down in the first place, then why not? I also have a question about the storage backend. In particular, I have a pretty powerful server that I intend to use as the NFS server, and a few servers to use as nodes. On the other hand, I don't have a powerful machine (at the moment) to use for the ovirt-engine. Would it be poor practice to run the ovirt-engine ON the NFS server? During engine setup, I see that you can setup an NFS share for ISOs from the ovirt-engine, but I don't think there's mention of just generalized storage there. I suspect it's "poor practice", but I thought I'd ask anyway. My setup will be relatively small (say, 4 nodes), and this would let me reduce 1 general server from the infrastructure (dedicated ovirt-engine). Thanks! :) Jason. ps: At the moment, I am not subscribed to users - please cc: me on responses. ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
