[linux-lvm] LVM mirror questions
jrharris19 at yahoo.com
Wed Oct 6 15:50:41 UTC 2010
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
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
Anyways, thanks again for the answer!
From: Petr Rockai <prockai at redhat.com>
To: LVM general discussion and development <linux-lvm at redhat.com>
Sent: Tue, October 5, 2010 1:02:55 AM
Subject: Re: [linux-lvm] LVM mirror questions
Jay <jrharris19 at yahoo.com> writes:
> What happens to an lvm mirror if the disk log is lost?
The mirror should continue to work with a core (memory) log.
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