From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: SSD journal suggestion Date: Wed, 07 Nov 2012 09:01:30 -0600 Message-ID: <509A77CA.5030206@inktank.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ie0-f174.google.com ([209.85.223.174]:44897 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754309Ab2KGPB1 (ORCPT ); Wed, 7 Nov 2012 10:01:27 -0500 Received: by mail-ie0-f174.google.com with SMTP id k13so2458404iea.19 for ; Wed, 07 Nov 2012 07:01:27 -0800 (PST) In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Gandalf Corvotempesta Cc: Sage Weil , ceph-devel@vger.kernel.org On 11/07/2012 06:28 AM, Gandalf Corvotempesta wrote: > 2012/11/7 Sage Weil : >> On Wed, 7 Nov 2012, Gandalf Corvotempesta wrote: >>> I'm evaluating some SSD drives as journal. >>> Samsung 840 Pro seems to be the fastest in sequential reads and write. > > The 840 Pro seems to reach 485MB/s in sequential write: > http://www.storagereview.com/samsung_ssd_840_pro_review > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > I'm using Intel 510s in a test node and can do about 450MB/s per drive. Right now I'm doing 3 journals per SSD, but topping out at about 1.2-1.4GB/s from the client perspective for the node with 15+ drives and 5 SSDs. It's possible newer versions of the code and tuning may increase that. TV pointed me at the new Intel DC S3700 which looks like a very interesting option (the 100GB model for $240). http://www.anandtech.com/show/6432/the-intel-ssd-dc-s3700-intels-3rd-generation-controller-analyzed Mark