Re: Performance question

[Mart van Santen <mart@xxxxxxxxxxxx>]

Dear Marek,

I would expect a higher performance, but did you measure this? with rados bench? Please note, ceph is build for parallel access, so the combined speed increases with more threads, if this is a single thread measurement, I wonder how well it reflects the performance of the platform. With rados bench you can specify how many threads you want to use.

Regards,

Mart

On 11/24/2015 04:37 PM, Marek Dohojda wrote:

Yeah they are, that is one thing I was planning on changing, What I am really interested at the moment, is vague expected performance.  I mean is 100MB around normal, very low, or "could be better"?

On Tue, Nov 24, 2015 at 8:02 AM, Alan Johnson <alanj@xxxxxxxxxxxxxx> wrote:

Are the journals on the same device – it might be better to use the SSDs for journaling since you are not getting better performance with SSDs?

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Marek Dohojda
Sent: Monday, November 23, 2015 10:24 PM
To: Haomai Wang
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: Performance question

 

 Sorry I should have specified SAS is the 100 MB :) , but to be honest SSD isn't much faster.

 

On Mon, Nov 23, 2015 at 7:38 PM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote:

On Tue, Nov 24, 2015 at 10:35 AM, Marek Dohojda
<mdohojda@xxxxxxxxxxxxxxxxxxx> wrote:
> No SSD and SAS are in two separate pools.
>
> On Mon, Nov 23, 2015 at 7:30 PM, Haomai Wang <haomaiwang@xxxxxxxxx> wrote:
>>
>> On Tue, Nov 24, 2015 at 10:23 AM, Marek Dohojda
>> <mdohojda@xxxxxxxxxxxxxxxxxxx> wrote:
>> > I have a Hammer Ceph cluster on 7 nodes with total 14 OSDs.  7 of which
>> > are
>> > SSD and 7 of which are SAS 10K drives.  I get typically about 100MB IO
>> > rates
>> > on this cluster.

So which pool you get with 100 MB?

>>
>> You mixed up sas and ssd in one pool?
>>
>> >
>> > I have a simple question.  Is 100MB within my configuration what I
>> > should
>> > expect, or should it be higher? I am not sure if I should be looking for
>> > issues, or just accept what I have.
>> >
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@xxxxxxxxxxxxxx
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>>
>>
>>
>> --
>> Best Regards,
>>
>> Wheat
>
>

--
Best Regards,

Wheat

 

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