Re: Cephfs total throughput

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On Tue, Sep 15, 2015 at 9:10 AM, Barclay Jameson
<almightybeeij@xxxxxxxxx> wrote:
> So, I asked this on the irc as well but I will ask it here as well.
>
> When one does 'ceph -s' it shows client IO.
>
> The question is simple.
>
> Is this total throughput or what the clients would see?
>
> Since it's replication factor of 3 that means for every write 3 are
> actually written.
>
> First lets assume I have only one cephfs client writing data.
>
> If this is total throughput then to get the maximum throughput for
> what a client would see do I need to divide it by 3?
>
> Else, if this is what my client sees then do I need to multiply this
> by 3 to see what my maximum cluster throughput would be?

I believe this is client-facing IO. It's pretty simple to check if
you've got an idle cluster; run rados bench and see if they're about
the same or about three times as large. ;)
-Greg
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