[linux-lvm] Mirrored LV

Larry Dickson ldickson at cuttedge.com
Tue Sep 16 23:01:32 UTC 2008

How often does the log get written in normal use, and how big does it get,
how fast? If it's a low-bandwidth sort of thing, could it go to some kind of
solid-state storage?

Larry Dickson
Cutting Edge Networked Storage

On 9/16/08, Koen Vermeer <koen at vermeer.tv> wrote:
> Op dinsdag 16-09-2008 om 13:42 uur [tijdzone -0700], schreef
> malahal at us.ibm.com:
> > The log records what regions of your master device are in sync with your
> > other mirror device. It is used to synchronize the failed regions from
> > the master to your other device when your 'other device' comes back to
> > life. This should work whether your log device is in memory or on a PV
> > by itself as long as you don't de-activate or restart your machine. The
> > log data on a PV can be useful for reboots.
> I had written a lot of text with extra questions, but it seems I just
> don't get it - yet.
> If I understand you correctly, you're statements are about when the
> 'other device' is failing. Is this right? If so, then the log should
> normally show that everything is synced. In that case, it's not of much
> use in normal operation. Now, when one disk fails, I need to replace it,
> and rebuild the mirror. So again, I don't need it, because I have to
> copy everything anyway. Only when a disk is temporarily gone, it may be
> of some use. Does this make sense?
> Best,
> Koen
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