From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: Re: SSD journal suggestion Date: Wed, 07 Nov 2012 22:59:03 +0100 Message-ID: <509AD9A7.5070208@profihost.ag> References: <509A77CA.5030206@inktank.com> <670668A8-4126-4EF8-B27B-7B00C8824F05@ornl.gov> <509A8A32.9020701@inktank.com> <8F1EF04A-96C0-402F-9DE2-3891514BD04F@ornl.gov> <509A8F4F.7090404@inktank.com> <509ACE8A.5090708@tuxadero.com> <509AD42A.9060108@tuxadero.com> <509AD646.30903@profihost.ag> <509AD8CA.3080502@tuxadero.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.profihost.ag ([85.158.179.208]:54838 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752377Ab2KGV7H (ORCPT ); Wed, 7 Nov 2012 16:59:07 -0500 In-Reply-To: <509AD8CA.3080502@tuxadero.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: martin@tuxadero.com Cc: Gandalf Corvotempesta , Mark Nelson , "Atchley, Scott" , Sage Weil , "ceph-devel@vger.kernel.org" Am 07.11.2012 22:55, schrieb Martin Mailand: > 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. HP told me they all use the same ships and Arista measures latency whil= e=20 only one port is in use. HP guarentees the latency when all ports are i= n=20 use. If this is correct or just somehing hp told me - i don't know. The= y=20 told me the arista is slower and the statistics are not comporable... > And I you should think at the price the HP5900 cost 3 times of the > Mellanox. Don't know what the Mellanox coests. I get the HP for a really good=20 price below 10.000 =80. Greets, Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html