Please let us know the results of your mirror testing.
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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 <prockai@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Sent: Tue, October 5, 2010 1:02:55 AM
Subject: Re: LVM mirror questions
Jay <jrharris19@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.
Yours,
Petr.
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