From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 449907F37 for ; Thu, 22 Oct 2015 13:27:12 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id CA141AC004 for ; Thu, 22 Oct 2015 11:27:11 -0700 (PDT) Received: from sandeen.net (sandeen.net [63.231.237.45]) by cuda.sgi.com with ESMTP id QRlSLRBVPSKZrWko for ; Thu, 22 Oct 2015 11:27:05 -0700 (PDT) Received: from liberator.sandeen.net (liberator.sandeen.net [10.0.0.4]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by sandeen.net (Postfix) with ESMTPSA id 81A7B602D370 for ; Thu, 22 Oct 2015 13:27:03 -0500 (CDT) Subject: Re: hdd + ssd References: <20151022202324.5f00807f@linux> From: Eric Sandeen Message-ID: <56292A76.8090600@sandeen.net> Date: Thu, 22 Oct 2015 13:27:02 -0500 MIME-Version: 1.0 In-Reply-To: <20151022202324.5f00807f@linux> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com On 10/22/15 1:23 PM, krautus@kr916.org wrote: > Hello I'm trying to understand why and how to add one or more SSD (as a cache drive / keeping xfs log) > to a traditional spinning xfs storage volume. > I mean: which data will go to the ssd ? Inodes and dentries will go to the ssd ? > Will the _read_ performance increase ? You might want to look into something like dm-cache https://en.wikipedia.org/wiki/Dm-cache (TBH, I've not used it before, so grains of salt apply for your usecase). Putting the log on an ssd is not likely to be the solution you want; it certainly won't speed up reads. -Eric > In general I'm looking to increase (cache) the reading performance of folders with a lot of small files (emails), > for email servers. > > Feel free to let me rtfm :) > I'd gladly study the documentation / articles / benchmarks but my google-fu isn't in best shape. > > Thank you, > Mike > _______________________________________________ > xfs mailing list > xfs@oss.sgi.com > http://oss.sgi.com/mailman/listinfo/xfs > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs