Hi Christian,
On 18 April 2014 12:28, Christian Balzer wrote:
>
> On Fri, 18 Apr 2014 11:34:15 +1000 Blair Bethwaite wrote:
> > So the PERC 710p, whilst not having the native JBOD mode of the
> > underlying LSI 2208 chipset, does allow per- virtual-disk cache and
> > read-ahead mode settings. It
On Fri, 18 Apr 2014 11:34:15 +1000 Blair Bethwaite wrote:
> > Message: 20
> > Date: Thu, 17 Apr 2014 17:45:39 +0900
> > From: Christian Balzer
> > To: "ceph-users@lists.ceph.com"
> > Subject: Re: [ceph-users] SSDs: cache pool/tier versus node-loca
> Message: 20
> Date: Thu, 17 Apr 2014 17:45:39 +0900
> From: Christian Balzer
> To: "ceph-users@lists.ceph.com"
> Subject: Re: [ceph-users] SSDs: cache pool/tier versus node-local
> block cache
> Message-ID: <20140417174539.6c713...@batzmaru.gol
>> >> I think the timing should work that we'll be deploying with Firefly and
>> >> so
>> >> have Ceph cache pool tiering as an option, but I'm also evaluating
>> >> Bcache
>> >> versus Tier to act as node-local block cache device. Does anybody have
>> >> real
>> >> or anecdotal evidence about whic
On Thu, 17 Apr 2014 12:58:55 +1000 Blair Bethwaite wrote:
> Hi Kyle,
>
> Thanks for the response. Further comments/queries...
>
> > Message: 42
> > Date: Wed, 16 Apr 2014 06:53:41 -0700
> > From: Kyle Bader
> > Cc: ceph-users
> > Subject: Re: [cep
Hi Kyle,
Thanks for the response. Further comments/queries...
> Message: 42
> Date: Wed, 16 Apr 2014 06:53:41 -0700
> From: Kyle Bader
> Cc: ceph-users
> Subject: Re: [ceph-users] SSDs: cache pool/tier versus node-local
> block cache
> Message-ID:
>
&g
>> Obviously the ssds could be used as journal devices, but I'm not really
>> convinced whether this is worthwhile when all nodes have 1GB of hardware
>> writeback cache (writes to journal and data areas on the same spindle have
>> time to coalesce in the cache and minimise seek time hurt). Any adv
New idea that is dependent on failure behaviour of the cache tier...
Carve the ssds 4-ways: each with 3 partitions for journals servicing the
backing data pool and a fourth larger partition serving a write-around
cache tier with only 1 object copy. Thus both reads and writes hit ssd but
the ssd ca
Hi all,
We'll soon be configuring a new cluster, hardware is already purchased -
OSD nodes are Dell R720XDs (E5-2630v2, 32GB RAM, PERC 710p, 9x 4TB NL-SAS,
3x 200GB Intel DC S3700, Mellanox CX3 10GE DP). 12 of these to start with.
So we have a 3:1 spindle:ssd ratio, but as yet I'm not sure how we
