cmurf. What the article and John is talking about is CephFS (which we do use). As you can see that is in the heading of the quote that you took. What John is n

cmurf. What the article and John is talking about is CephFS (which we do use). As you can see that is in the heading of the quote that you took. What John is not talking about is the Object Store (S3 compatible) or RBD (rados block device, EBS like block storage). There's countless people using both Object Store and RBD in production today. Both of these are the most deployed solutions for OpenStack (for storage or object storage). For example the Bloomberg folks use in production. We use CephFS, and contributed to it earlier, and helped find a lot of bugs in the kernel and the MDS. Last time we uncounted a bug was over a year ago. We currently only use one MDS with a hot spare (backup node actively replaying the log). What's really missing today from CephFS is the fsck and restore utilities and I believe people are working on them as we speak.