<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Dear Wayne,<br>
I'd expect DRBD to find the meta-data even if the backing device
is larger, because from DRBD's point of view, the resource's size
does not change until you run "drbdadm resize". So I'd say: you <i>should</i>
be fine.<br>
Now to be honest, you don't have to trust me, as I usually let
DRBD do a complete resync when I replace backing devices. Adaptive
resync rate keeps the resource responsive, and I have backups if
ever the up-to-date node crashes in the meantime. I the end I
treat it like a RAID rebuild.<br>
Lionel Sausin.<br>
<br>
Le 20/02/2014 02:34, Wayne a écrit :<br>
</div>
<blockquote cite="mid:20140220013448.GA31346@slacker.ja10629.home"
type="cite">
<pre wrap="">I currently have DRBD 8.3 working between 2 Debian boxes with external
RAID storage as the backing device. I intend to update the RAID storage
on each system since they are rather old now. I need to do this with
minimal down time of course. What is down-time ever maximal, LOL?
The backing stores on each system right now are identically sized
logical block devices (LUNS) exposed by the RAID hardware.
I've already installed one RAID onto the secondary DRBD system. My plan
is to take the secondary DRBD offline, use 'dd' to move the data from
the current RAID to the new RAID, reconfigure the backing device to the
new RAID and set DRBD online. I'm hoping this will only require a
re-sync of the blocks that have change since the secondary was brought
down.
I believe a problem is that the new backing device is much larger than
the current backing device. So a straight dd won't place the meta-data in
the correct position on the new block device? Is this a correct
assumption? If so what is the correct way to handle this migration while
minimizing re-sync time?
Is this even the correct approach? This is my first crack at this so I
may be way off.
Any and all help is appreciated.
Thanks,
Wayne
_______________________________________________
drbd-user mailing list
<a class="moz-txt-link-abbreviated" href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a>
<a class="moz-txt-link-freetext" href="http://lists.linbit.com/mailman/listinfo/drbd-user">http://lists.linbit.com/mailman/listinfo/drbd-user</a>
</pre>
</blockquote>
<br>
</body>
</html>