I'm probably misunderstanding the question but if you're getting 3GB/s from your dd, you're already caching. Can you provide some more detail on what you're trying to achieve.
On 16 Jun 2016 21:53, "Patrick McGarry" <pmcgarry@xxxxxxxxxx> wrote:
Moving this over to ceph-user where it’ll get the eyeballs you need.
On Mon, Jun 13, 2016 at 2:58 AM, Marcus Strasser
<Marcus.Strasser@xxxxxxxxxxxxxxxx> wrote:
> Hello!
>
>
>
> I have a little test cluster with 2 server. Each Server have an osd with 800
> GB, there is a 10 Gbps Link between the servers.
>
> On a ceph-client i have configured a cephfs, mount kernelspace. The client
> is also connected with a 10 Gbps Link.
>
> All 3 use debian
>
> 4.5.5 kernel
>
> 64 GB mem
>
> There is no special configuration.
>
>
>
> Now the question:
>
> When i use the dd (~11GB) command in the cephfs mount, i get a result of 3
> GB/s
>
>
>
> dd if=/dev/zero of=/cephtest/test bs=1M count=10240
>
>
>
> Is it possble to transfer the data faster (use full capacity oft he network)
> and cache it with the memory?
>
>
>
> Thanks,
>
> Marcus Strasser
>
>
>
>
>
> Marcus Strasser
>
> Linux Systeme
>
> Russmedia IT GmbH
>
> A-6850 Schwarzach, Gutenbergstr. 1
>
>
>
> T +43 5572 501-872
>
> F +43 5572 501-97872
>
> marcus.strasser@xxxxxxxxxxxxxxxx
>
> highspeed.vol.at
>
>
>
>
--
Best Regards,
Patrick McGarry
Director Ceph Community || Red Hat
http://ceph.com || http://community.redhat.com
@scuttlemonkey || @ceph
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