From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx08.extmail.prod.ext.phx2.redhat.com [10.5.110.12]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o96Gbf3w031695 for ; Wed, 6 Oct 2010 12:37:41 -0400 Received: from ps536.phatservers.com (ps536.phatservers.com [216.17.105.202]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o96GbUmx010798 for ; Wed, 6 Oct 2010 12:37:30 -0400 Received: from r74-192-2-154.bcstcmta01.clsttx.tl.dh.suddenlink.net ([74.192.2.154] helo=raydesk1.bettercgi.com) by ps536.phatservers.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.66) (envelope-from ) id 1P3WzX-0006p9-VO for linux-lvm@redhat.com; Wed, 06 Oct 2010 09:37:21 -0700 Date: Wed, 06 Oct 2010 11:37:18 -0500 From: Ray Morris References: <87y6adm5hs.fsf@twilight.int.mornfall.net> <11404.7696.qm@web120712.mail.ne1.yahoo.com> In-Reply-To: <11404.7696.qm@web120712.mail.ne1.yahoo.com> (from jrharris19@yahoo.com on Wed Oct 6 10:50:41 2010) Message-Id: <1286383038.7114.6@raydesk1.bettercgi.com> MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 8bit Subject: Re: [linux-lvm] LVM mirror questions Reply-To: 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"; delsp="Yes"; format="Flowed" To: LVM general discussion and development Please let us know the results of your mirror testing. -- Ray Morris support@bettercgi.com Strongbox - The next generation in site security: http://www.bettercgi.com/strongbox/ Throttlebox - Intelligent Bandwidth Control http://www.bettercgi.com/throttlebox/ Strongbox / Throttlebox affiliate program: http://www.bettercgi.com/affiliates/user/register.php On 10/06/2010 10:50:41 AM, Jay wrote: > Hi Petr, > > Thanks for the reply. "Should continue to work.." leaves me with > some doubt. > My intent for a mirror is for a datastore that has reliability at > the expense > of space. In addition, when a large datastore is rebooted, there > would be a > period of time when the data is being mirrored, which leaves a window > of > peril. After I migrate my data off of lvm and onto an md device, I > will test > lvm. > > Test #1 will be start a huge write operation on a mirror that > consists of 2 > mirrors and 1 log, all on seperate pvs. While the write operation is > happening, I will unplug the log drive and see if lvm switches in > midstream to a > memory log without loss. > > Test #2 will be to see if I can make lvm activate lvs or vgs in a > certain order. > That way I could make the first 20 extents of every physical device > part of a > vg/lv that houses mirror logs. These log lvs would be mirrored > across all > physical devices. The log lvs would have memory logs, which would > be ok since > they will be so small. The window of peril is reduced from hours > to a few > seconds. > > Anyways, thanks again for the answer! > > Jason Harris > > > > ________________________________ > From: Petr Rockai > To: LVM general discussion and development > Sent: Tue, October 5, 2010 1:02:55 AM > Subject: Re: [linux-lvm] LVM mirror questions > > Jay writes: > > What happens to an lvm mirror if the disk log is lost? > > The mirror should continue to work with a core (memory) log. > > Yours, > Petr. > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > > > ------quoted attachment------ > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/