Re: why ZFS on ceph is unstable?

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On Fri, 19 Sep 2014, Nicheal wrote:
> Hi developers,
> 
> it mentioned in the source code that OPTION(filestore_zfs_snap,
> OPT_BOOL, false) // zfsonlinux is still unstable. So if we turn on
> filestore_zfs_snap and neglect journal like btrf, it will be unstable?
> 
> As is mentioned on the "zfs on linux community", It is stable enough
> to run a ZFS root filesystem on a GNU/Linux installation for your
> workstation as something to play around with. It is copy-on-write,
> supports compression, deduplication, file atomicity, off-disk caching,
> (encryption not support), and much more.  So it seems that all
> features are supported except for encryption.
> Thus, I am puzzled that the unstable, you mean, is ZFS unstable
> itself. Or it now is already stable on linux, but still unstable when
> used as ceph FileStore filesystem.
> 
> If so, what will happen if we use it, losing data or frequent crash?

At the time the libzfs support was added, zfsonlinux would crash very 
quickly under the ceph-osd workload.  If that has changed, great!  We 
haven't tested it, though, since Zheng added the initial support.

sage
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