Hello, I played around with rbd caching by activating "Writeback" mode in proxmox6. This really helps for write performance so I would like to use it but the documenattion says that a possible danger is a power outage.
Now I have a battery backup but you never know if the outage is just a minute or an hour, and batteries would not keep the servers up for more that say 15min. So what I thought about is to enable rbd caching but when a power outage occurs I would like to automatically disable it. Using proxmox this requires a reboot of the VM so this is no option. But perhaps I could set globally a ceph variable eg "rbd cache size" to "0" and thus effectively would disable writeback caching. Should this work? Another question about "Wrtiteback" rbd caching is if I should also enable it for disks with a lvm striped over 4 rbd images? Each striped LVs has a filesystem on top. Is it also advisable to use rbd caching in this scenario as it is for a single disk? Thanks a lot for your help Rainer -- Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1 56070 Koblenz, Web: http://www.uni-koblenz.de/~krienke, Tel: +49261287 1312 PGP: http://www.uni-koblenz.de/~krienke/mypgp.html, Fax: +49261287 1001312 _______________________________________________ pve-user mailing list pve-user@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
