I found the checksum based sync last night after sending the email - thanks for pointing it out though.<div><br></div><div>I'm doing the sync now. Is there any way to see what drbd is able to match via the checksums?</div>
<div><br></div><div>Thanks,</div><div>Richard<br><br><div class="gmail_quote">On Thu, Feb 2, 2012 at 6:19 AM, Lars Ellenberg <span dir="ltr"><<a href="mailto:lars.ellenberg@linbit.com">lars.ellenberg@linbit.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Thu, Feb 02, 2012 at 03:11:44PM +0100, Felix Frank wrote:<br>
> On 02/02/2012 02:58 PM, Lars Ellenberg wrote:<br>
> >> Technically, if you'd manipulate the local metadata to make your UUID<br>
> >> > 36357CED276F2436, DRBD would assume that it can perform a quicksync (I<br>
> >> > believe).<br>
> ...<br>
> > Now the bits are all set, there is no way to "unset" them again.<br>
><br>
> Ah, I see now. Manipulating UUIDs could be done with "set-gi", whereas<br>
> there is no counterpart for obliterating the bitmap.<br>
<br>
</div>Of course there is, which is also part of the process of truck based<br>
replication (the clear-bitmap part, before you start cloning locally).<br>
<div class="im"><br>
> I had been thinking of doing something gory with dump-md + restore-md,<br>
> anyway (not that I'd heartily recommend trying this kind of thing). Out<br>
> of curiosity, though: Is that technically feasible?<br>
<br>
</div>Sure.<br>
<br>
The tricky part is, now that most (all?) bits are set, how do you<br>
decide which bits you can clear safely, and which must remain set,<br>
without first comparing the coresponding data blocks?<br>
<br>
Right.<br>
So why not let DRBD do that comparison for you?<br>
-> checksum based resync.<br>
<div class="im HOEnZb"><br>
--<br>
: Lars Ellenberg<br>
: LINBIT | Your Way to High Availability<br>
: DRBD/HA support and consulting <a href="http://www.linbit.com" target="_blank">http://www.linbit.com</a><br>
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