[linux-lvm] LVM mirror questions

[Jay]

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 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.

Yours,
   Petr.

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