<div dir="ltr">Hello,<div><br></div><div>thank you for the replies. To summarize the question even more:</div><div><br></div><div>- Two servers are DRDB 8.0.16 and sync data, on CentOS 5.</div><div><br></div><div>- Only the secondary will be upgraded 8.4 on CentOS 6.</div><div><br></div><div>Can the secondary 8.4 still sync (and get its data updated) <b>safely</b> from the 8.0.16 one, using the same protocol C?</div><div><br></div><div>(note: 8.0.16 will always be primary until it crashes or/and is later upgraded as well to 8.4)</div><div><br></div><div><br></div><div>Thank you.</div><div><br></div><div>Regards</div><div><br></div><div> Yves</div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Mar 13, 2015 at 5:37 PM, Prater, James K. <span dir="ltr"><<a href="mailto:jprater@draper.com" target="_blank">jprater@draper.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<font style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hello Yves,<br>
<br>
I would really check with or at least wait for Lars from Linbit to respond. At first glance, I would update "B" so you can do some initial testing. Since you may have some issues re compiling components. Then allow the normal transactions to occur from "A"
by connecting it to the primary. The update DRDB on "A". You should not require the data to be invalidated. We are still talking about release "8.x". It should be backwards compatible.<br>
<br>
James</font><br>
<br>
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<font style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><b>From</b>: yves [mailto:<a href="mailto:user@kochira.com" target="_blank">user@kochira.com</a>]
<br>
<b>Sent</b>: Thursday, March 12, 2015 10:45 AM<br>
<b>To</b>: <a href="mailto:drbd-user@lists.linbit.com" target="_blank">drbd-user@lists.linbit.com</a> <<a href="mailto:drbd-user@lists.linbit.com" target="_blank">drbd-user@lists.linbit.com</a>> <br>
<b>Subject</b>: [DRBD-user] Sync two different versions of DRBD <br>
</font> <br>
</div><div><div class="h5">
<div dir="ltr">Hello,
<div><br>
</div>
<div>two servers A (primary) and B (secondary), are each using DRBD 8.0.16 via protocol C.</div>
<div><br>
</div>
<div>Since only one can be migrated to 8.4 at a time, is it possible to</div>
<div><br>
</div>
<div>- keep unchanged A (8.0.16)</div>
<div>- install 8.4 on B (similar config with protocol C)</div>
<div>- invalidate B data (created from 8.0.16)</div>
<div>- sync A -> B</div>
<div><br>
</div>
<div>and keep this for a few days.</div>
<div><br>
</div>
<div>Does it safely work?</div>
<div><br>
</div>
<div>Thank you and regards,</div>
<div><br>
</div>
<div> Yves</div>
</div>
</div></div><hr>
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</blockquote></div><br></div></div>