On Mon, May 11, 2015 at 1:57 AM, Kenneth Waegeman <kenneth.waegeman@xxxxxxxx> wrote: > Hi all, > > I have a few questions about ceph-fuse options: > - Is the fuse writeback cache being used? How can we see this? Can it be > turned on with allow_wbcache somehow? I'm not quite sure what you mean here. ceph-fuse does maintain an internal writeback cache which you can control with the "client_oc_size" and related config values. It is enabled by default. > > - What is the default of the big_writes option? (as seen in > /usr/bin/ceph-fuse --help) . Where can we see this? This just enables the FUSE big-writes option. According to FUSE this will "enable larger than 4kB writes" — that is, if FUSE has a bunch of data to write out to a file, the call into the userspace code will share it in larger sizes. It's a CPU and request optimization. > If we run ceph fuse as this: ceph-fuse /mnt/ceph -o > max_write=$((1024*1024*64)),big_writes > we don't see any of this in the output of mount: > ceph-fuse on /mnt/ceph type fuse.ceph-fuse > (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other) > > Can we see this somewhere else? What are you trying to see? There's a bunch of logging in whatever file you've pointed ceph-fuse at (by default, /var/log/ceph/ceph-client.****.log or similar). -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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