6
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
>
> Hi Nick,
>
> m( of course, you're right. Yes, we have rbd_cache enabled for KVM / QEMU.
> That probably also explains the large diff between avg
> and stdev.
> Thanks for the Point
Hi Nick,
m( of course, you're right. Yes, we have rbd_cache enabled for KVM /
QEMU. That probably also explains the large diff between avg and stdev.
Thanks for the Pointer.
Unfortunately I have not yet gotten fio to work with the rbd engine.
Always fails with
> rbd engine: RBD version: 0.1.9
>
at are your write cache settings for qemu?
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Sascha Vogt
> Sent: 06 December 2016 12:14
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
>
>
time_based=1
> runtime=360
> numjobs=1
>
> [rbd_iodepth1]
> iodepth=1
>
>> -Original Message-
>> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
>> Sascha Vogt
>> Sent: 05 December 2016 14:08
>> To: ceph-users@lists.ceph.com
>
s-boun...@lists.ceph.com] On Behalf Of
> Sascha Vogt
> Sent: 05 December 2016 14:08
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
>
> Hi Nick,
>
> thanks for sharing your results. Would you be able to share the fio args you
> used for benchmar
Hi Nick,
thanks for sharing your results. Would you be able to share the fio args
you used for benchmarking (especially the ones for the screenshot you
shared in the write latency post)?
What I found is that when I do some 4k write benchmarks my lat stdev is
much higher then the average (also wid
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> William Josefsson
> Sent: 14 November 2016 14:46
> To: Nick Fisk
> Cc: Ceph Users
> Subject: Re: [ceph-users] Ceph Blog Articles
>
> Hi Nick, I found the graph
Hi Nick, I found the graph very useful explaining the concept. thx for sharing.
I'm currently planning to setup a new cluster and wanted to get low
latency by using,
2U server,
6xIntel P3700 400GB for journal and
18x1.8TB Hitachi Spinning 10k SAS. My OSD:Journal ratio would be 3:1.
All over 10Gbi
bably just requires scaling out with more resource.
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Maged Mokhtar
> Sent: 14 November 2016 11:18
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
&
--
From: "Nick Fisk"
Sent: Monday, November 14, 2016 11:41 AM
To: "'Maged Mokhtar'" ;
Subject: RE: [ceph-users] Ceph Blog Articles
Hi Maged,
I would imagine as soon as you start saturating the disks, the latency
impact would make t
:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Maged Mokhtar
> Sent: 12 November 2016 16:08
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
>
>
> Hi Nick,
>
> Maybe not directly relating to your use case, but it will nice to know, at
> least
Fulvio Galeazzi [mailto:fulvio.galea...@garr.it]
> Sent: 14 November 2016 09:25
> To: n...@fisk.me.uk; 'Ceph Users'
> Subject: Re: [ceph-users] Ceph Blog Articles
>
> Hallo Nick, very interesting reading, thanks!
>What are you using for measuring performance? Base &q
Hallo Nick, very interesting reading, thanks!
What are you using for measuring performance? Base "fio" or something
else? Would you be willing to attach to the article the relevant part of
the benchmark tool configuration?
Thanks!
Fulvio
Original Message
ick
>
>> -Original Message-
>> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
>> Maged Mokhtar
>> Sent: 11 November 2016 21:48
>> To: ceph-users@lists.ceph.com
>> Subject: Re: [ceph-users] Ceph Blog Articles
>>
>>
>
e
threaded at some point.
Nick
> -Original Message-
> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of
> Maged Mokhtar
> Sent: 11 November 2016 21:48
> To: ceph-users@lists.ceph.com
> Subject: Re: [ceph-users] Ceph Blog Articles
>
>
>
Nice article on write latency. If i understand correctly, this latency is
measured while there is no overflow of the journal caused by long
sustained writes else you will start hitting the HDD latency. Also queue
depth you use is 1 ?
Will be interested to see your article on hardware.
/Maged
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