ceph-fuse options: writeback cache

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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?

- What is the default of the big_writes option? (as seen in /usr/bin/ceph-fuse --help) . Where can we see this? 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?

Many thanks!!

Kenneth
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