From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martin Mailand <martin@tuxadero.com>
Subject: Re: SSD journal suggestion
Date: Wed, 07 Nov 2012 22:55:22 +0100
Message-ID: <509AD8CA.3080502@tuxadero.com>
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To: Stefan Priebe <s.priebe@profihost.ag>
Cc: Gandalf Corvotempesta <gandalf.corvotempesta@gmail.com>, Mark Nelson <mark.nelson@inktank.com>, "Atchley, Scott" <atchleyes@ornl.gov>, Sage Weil <sage@inktank.com>, "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>

Hi Stefan,

deep buffers means latency spikes, you should go for fast switching 
latency. The HP5900 has a latency of 1ms, the Arista and Mellanox of 250ns.
And I you should think at the price the HP5900 cost 3 times of the Mellanox.

-martin

Am 07.11.2012 22:44, schrieb Stefan Priebe:
> Am 07.11.2012 22:35, schrieb Martin Mailand:
>> Hi,
>>
>> I tested a Arista 7150S-24, a HP5900 and in a few weeks I will get a
>> Mellanox MSX1016. ATM the Arista is may favourite.
>> For the dual 10GeB NICs I tested the Intel X520-DA2 and the Mellanox
>> ConnectX-3. My favourite is the Intel X520-DA2.
>
> That's pretty interesting i'll get the HP5900 and HP5920 in a few weeks.
> HP told me the deep packet buffers of the HP5920 will burst the
> performance and should be used for storage related stuff.
>
> Greets,
> Stefan
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