From mboxrd@z Thu Jan 1 00:00:00 1970 From: Owen Synge Subject: Re: questions about erasure coded pool and rados Date: Fri, 17 Oct 2014 12:16:13 +0200 Message-ID: <5440EC6D.9060501@suse.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: Received: from mail.emea.novell.com ([130.57.118.101]:59870 "EHLO mail.emea.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750835AbaJQKQy (ORCPT ); Fri, 17 Oct 2014 06:16:54 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: yue longguang , ceph-devel@vger.kernel.org An erasure encoded pool cannot be accessed directly using rbd. For this reason we need a cache pool and an erasure pool. This not only allows supporting rbd but increases performance. http://karan-mj.blogspot.de/2014/04/erasure-coding-in-ceph.html http://docs.ceph.com/docs/master/rados/operations/pools/ http://ceph.com/docs/master/rados/operations/cache-tiering/ Good luck Owen On 10/17/2014 12:13 PM, yue longguang wrote: > 1. why erasure coded pool does not work with rbd? > 2. i used rados command to put a file into erasue coded pool,then rm > it. why the file remains on osd's backend fs all the time? > 3. what is the best use case with erasure coded pool? > > 4. command of 'rados ls' is to list objects, where are the object-name stored? > 5.when a rbd file is put on erasure coded pool, where is the > infomation(rbd name) of the rbd stored? > > thanks > -- > 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 >