Re: [GLLUG] LVM / KVM Question
Andy Smith via GLLUG wrote: Hi, On Tue, Feb 15, 2022 at 10:19:32AM +, Ken Smith via GLLUG wrote: I'm contemplating a system where I pass a LVM LV through to a KVM VM. On the host I'm thinking that I could do a backup of the LV using a LVM snapshot. What am I missing, is this a mad idea? Many people do this. However: - Backed up data from the snapshot won't contain working data from within the memory of the processes in the VM, so if you restored from it, it would be like coming up after a power loss. - Lots of other KVM disk backends can do snapshots so LVM isn't required to do this. Cheers, Andy Thank you Andy, I agree a backup 'in flight' like this may have compromised integrity. I'm also looking at QCOW snapshots. :-) Ken -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- GLLUG mailing list GLLUG@mailman.lug.org.uk https://mailman.lug.org.uk/mailman/listinfo/gllug
Re: [GLLUG] LVM / KVM Question
Hi, On Tue, Feb 15, 2022 at 10:19:32AM +, Ken Smith via GLLUG wrote: > I'm contemplating a system where I pass a LVM LV through to a KVM VM. > > On the host I'm thinking that I could do a backup of the LV using a LVM > snapshot. > > What am I missing, is this a mad idea? Many people do this. However: - Backed up data from the snapshot won't contain working data from within the memory of the processes in the VM, so if you restored from it, it would be like coming up after a power loss. - Lots of other KVM disk backends can do snapshots so LVM isn't required to do this. Cheers, Andy -- https://bitfolk.com/ -- No-nonsense VPS hosting -- GLLUG mailing list GLLUG@mailman.lug.org.uk https://mailman.lug.org.uk/mailman/listinfo/gllug
[GLLUG] LVM / KVM Question
Hi All, I'm contemplating a system where I pass a LVM LV through to a KVM VM. On the host I'm thinking that I could do a backup of the LV using a LVM snapshot. What am I missing, is this a mad idea? Thanks Ken -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- GLLUG mailing list GLLUG@mailman.lug.org.uk https://mailman.lug.org.uk/mailman/listinfo/gllug
