Le 31/07/22 à 18:49, DERUMIER, Alexandre a écrit : > Le 31/07/22 à 18:19, Dietmar Maurer a écrit : >>> This is really a blocker for me,I can't use pbs because I'm using nvme >>> is production, and a 7200k hdd backup in a remote 200km site with 5ms >>> latency. >> Why don't you use a local(fast) PBS instance, then sync to the slow remote? >> > Hi Dietmar. > > Can I use a small local fast PBS instance without need to keep the full > datastore chunks ? > > I have 300TB nvme in production, I don't want to buy 300TB nvme for backup. > > I known that I can keep more retentions on remote storage slow, but what > about the local fast pbs ? > > Maybe also, currently if you pbs server is crashing/shutdown/halt/... when a backup is running,
the vm writes are totally frozen. Or if network problem occur, it can hang the vm too. That's why I think than a local cache (could be optionnal) could be a great improvment. I found doc about fleecing, technally, it's just exposing a new blockdev inside qemu, like a virtual frozen snapshot. So I think it could work with proxmox backup code too. https://www.mail-archive.com/qemu-devel@nongnu.org/msg876056.html ####create the fleecing device qmp: transaction [ block-dirty-bitmap-add {node: disk0, name: bitmap0, persistent: true} blockdev-add* {node-name: tmp-protocol, driver: file, filename: temp.qcow2} blockdev-add {node-name: tmp, driver: qcow2, file: tmp-protocol} blockdev-add {node-name: cbw, driver: copy-before-write, file: disk0, target: tmp} blockdev-replace** {parent-type: qdev, qdev-id: sda, new-child: cbw} blockdev-add {node-name: acc, driver: snapshot-access, file: cbw} ] #### launch qemu backup (push model) --> should use proxmox backup code here instead # Add target node. Here is qcow2 added, but it may be nbd node or something else blockdev-add {node-name: target-protocol, driver: file, filename: target.qcow2} blockdev-add {node-name: target, driver: qcow2, file: target-protocol} # Start backup blockdev-backup {device: acc, target: target, ...} ] _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
