<html><head><style type="text/css"></style></head><body><div style="font-family:'times new roman', 'new york', times, serif;font-size:12pt"><div>Phillip, </div><div><br></div><div>Thank you for your answer and advice. How unfortunate about lvm mirroring being broken. I like your suggestion about how it SHOULD work. In fact, long ago in a different age when I was working with rs6000s, I believe that is how reliable mirroring was accomplished with the ibm lvm. Either that or it was that the metadata/log block was stored on multiple disks with a quorum needed to be functional.</div><div><br></div><div>I will convert to md mirror device. If I had more skill, I would contribute somehow to the development effort. As it is, I will lurk on the list to see I can be helpful to someone else. Again, I appreciate your help.</div><div><br></div><div>Regards,</div><div>Jason Harris</div><div><br></div><div> </div><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><br><div style="font-family:arial, helvetica, sans-serif;font-size:13px"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Phillip Susi <psusi@cfl.rr.com><br><b><span style="font-weight: bold;">To:</span></b> LVM general discussion and development <linux-lvm@redhat.com><br><b><span style="font-weight: bold;">Cc:</span></b> Jay <jrharris19@yahoo.com><br><b><span style="font-weight: bold;">Sent:</span></b> Tue, October 5, 2010 8:40:46 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [linux-lvm] LVM mirror questions<br></font><br> On 10/4/2010 7:55 PM, Jay wrote:<br>> the other disk and lvcovert. But it wouldn't work, saying I needed to<br>> add space on yet a third device for the log. Either that, or I could<br>> keep the mirror log in memory. Lvm would have to rebuild a 1TB mirror<br>> every time the system was rebooted if the log was left in memory. That<br>> doesn't sound efficient. So. Put the log on disk. I couldn't find<br>> an answer in man pages, but if the log is lost, then is the whole mirror<br>> lost ? That would mean to have the benefits of a mirror, the log would<br>> have to be at least as reliable as the mirror itself (or<br>> inconsequential). <br>> <br>> So, another mirror would have to be built of tiny size to hold the log,<br>> then lvconvert can be given something like -log disk /dev/vghuh/lvtiny,<br>> etc..<br><br>As you have noticed, LVM mirror support is basically broken or not fully<br>implemented yet. The mirror log SHOULD be stored on both legs of the<br>mirror in a block allocated automatically in the metadata area by lvm,<br>but isn't. If you want to mirror, you should do so using mdadm and then<br>use the md device as an lvm pv.<br></div></div><div style="position:fixed"></div> </div><br> </body></html>