I have a program that monitors the speed, and I have seen 1TB/s pop up and there is just no way that is true.
Probably the way it is calculated is prone to extreme measurements, where if you average it out you get a more realistic number.
On Tue, Sep 15, 2015 at 12:25 PM Mark Nelson <mnelson@xxxxxxxxxx> wrote:
FWIW I wouldn't totally trust these numbers. At one point a while back
I had ceph reporting 226GB/s for several seconds sustained. While that
would have been really fantastic, I suspect it probably wasn't the case. ;)
Mark
On 09/15/2015 11:25 AM, Barclay Jameson wrote:
> Unfortunately, it's not longer idle as my CephFS cluster is now in production :)
>
> On Tue, Sep 15, 2015 at 11:17 AM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
>> 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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