Like all writeback, you'll lost datas in memory before the fsync of the filesystem, but not corruption of the filesystem. (writeback = rbd_cache=true)
note that rbd writeback help only for sequential of small writes (aggregate in 1big transaction to send to ceph). Also, read latency is bigger when writeback is enable. ----- Mail original ----- De: "Mark Schouten" <[email protected]> À: "proxmoxve" <[email protected]> Envoyé: Lundi 12 Novembre 2018 14:45:41 Objet: [PVE-User] Risks for using writeback on Ceph RBD Hi, We've noticed some performance wins on using writeback for Ceph RBD devices, but I'm wondering how we should project risks on using writeback. Writeback isn't very unsafe, but what are the risks in case of powerloss of a host? Thanks, -- Mark Schouten | Tuxis Internet Engineering KvK: 61527076 | http://www.tuxis.nl/ T: 0318 200208 | [email protected] _______________________________________________ pve-user mailing list [email protected] https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user _______________________________________________ pve-user mailing list [email protected] https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
