Re: [Samba] ceph_vms performance
- Date: Wed, 23 May 2018 10:29:23 -0700
- From: Jeremy Allison via samba <samba@xxxxxxxxxxxxxxx>
- Subject: Re: [Samba] ceph_vms performance
On Wed, May 23, 2018 at 02:13:30PM +0200, David Disseldorp via samba wrote:
> Hi Tom,
> On Wed, 23 May 2018 09:15:15 +0200, Thomas Bennett via samba wrote:
> > Hi,
> > I'm testing out ceph_vms vs a cephfs mount with a cifs export.
> I take it you mean the Ceph VFS module (vfs_ceph)?
> > I currently have 3 active ceph mds servers to maximise throughput and
> > when I have configured a cephfs mount with a cifs export, I'm getting
> > a reasonable benchmark results.
> Keep in mind that increasing the number of active MDS servers doesn't
> necessarily mean that you'll see better performance, especially if the
> client workload is spread across the full filesystem tree, rather than
> isolated into the corresponding sharded MDS subdirectories.
> > However, when I tried some benchmarking with the ceph_vms module, I
> > only got a 3rd of the comparable write throughput.
> > I'm just wondering if this is expected, or if there is an obvious
> > configuration setup that I'm missing.
> My initial assumption would be that the improved CephFS kernel mount
> performance is mostly due to the Linux page cache, which is utilised
> for buffered client I/O.
Interesting. You might be able to improve the Samba vfs_ceph performance
by tuning the Samba write cache size (although for SMB2 leases this
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