From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pobox.fab.redhat.com (pobox.fab.redhat.com [10.33.63.12]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n0TFYoDh018525 for ; Thu, 29 Jan 2009 10:34:50 -0500 Received: from breeves.fab.redhat.com (breeves.fab.redhat.com [10.33.0.40]) by pobox.fab.redhat.com (8.13.1/8.13.1) with ESMTP id n0TFYm5o022159 for ; Thu, 29 Jan 2009 10:34:48 -0500 Message-ID: <4981CC92.5090703@redhat.com> Date: Thu, 29 Jan 2009 15:34:42 +0000 From: "Bryn M. Reeves" MIME-Version: 1.0 Subject: Re: [linux-lvm] Local + iSCSI disks References: <20090129153047.GA10306@esri.com> In-Reply-To: <20090129153047.GA10306@esri.com> Content-Transfer-Encoding: 7bit Reply-To: bmr@redhat.com, LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Ray Van Dolson wrote: > Looking for thoughts on a VolGroup and LV made up of both local and > remote, iSCSI attached disks. Obviously it will work, but are there > any settings or "gotchas" I should be aware of with this configuration? > Obviously a speed penalty... The period between the local devices becoming available and the iSCSI volumes appearing will be potentially confusing for the LVM tools and might need some special handling depending on how your distribution manages LVM activation. In future as LVM moves to having udev detect devices and call LVM to have them activated this should get easier. > I know I could also aggregate with the md driver and set things up to > do writes/reads to a specific disk depending on whether or not its > local, etc. Anything like that in the LVM world? There's the replicator target being worked on: http://people.redhat.com/heinzm/sw/dm/dm-repl/ Regards, Bryn.