Hello, If I'm storing large VM images on Ceph RDB, and I have OSD journals on SSD, should I _not_ be using a copy on write file system on the OSDs? I read that large VM images don't play well with COW (e.g. btrfs) [1]. Does Ceph improve this situation? Would btrfs outperform non-cow filesystems in this setting?
Also, I'm considering placing my OSD journals on f2fs-formatted partitions on my Samsung SSDs for hardware resiliency (Samsung created both my SSDs and f2fs) [2]. F2FS uses copy on write [3]. Has anyone ever tried this? Thoughts? [1] https://wiki.archlinux.org/index.php/Btrfs#Copy-On-Write_.28CoW.29 [2] https://www.usenix.org/legacy/event/fast12/tech/full_papers/Min.pdf [3] http://www.dslreports.com/forum/r27846667- Thanks, Joshua
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