<div>Thanks Lars,</div>
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<div>please see comments below.<br></div>
<div class="gmail_quote">2009/3/13 Lars Ellenberg <span dir="ltr"><<a href="mailto:lars.ellenberg@linbit.com">lars.ellenberg@linbit.com</a>></span><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="im">On Fri, Mar 13, 2009 at 11:01:05AM +0000, Maros Timko wrote:<br>> Hi all,<br>><br>> I wonder why user documentation states how to estimate required DRBD<br>> metadata size for external metadata:<br>
> <a href="http://www.drbd.org/users-guide-emb/ch-internals.html#s-external-meta-data" target="_blank">http://www.drbd.org/users-guide-emb/ch-internals.html#s-external-meta-data</a><br>> when it is quite hardcoded value. At least example drbd.conf file still<br>
> includes this information (128MB for each DRBD resource).<br><br></div>there is meta-disk, and there is flexible-meta-disk.<br><br>man drbd.conf</blockquote>
<div> </div>
<div>Wow,</div>
<div>I thought flexible-meta-disk can be used for internal metadata only. I think I saw it somewhere in my first contact with DRBD. Fine, now I checked man drbd.conf and it in place since 8.2.6 so Mea Culpa. I should not simply lean on template drbd.conf<br>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span id=""></span><br>> So did ahything chance with DRBD 8.3.0 regarding external metadata size<br>> requirements?<br>
<br></blockquote>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">with drbd 8.3, you can use up to 16 TiB storage (well, you should not<br>have that exact amount, rather some sectors less).<br>
<br>that would need 512 MiB worth of bitmap, plus the usual few KiB<br>for "superblock" and activity log.<br></blockquote>
<div> </div>
<div>But then it is quite interesting. If I am using meta-disk I cannot attach device that is larger then 4TB and if I want to, I simply have to use flexible-meta-disk. I think I have a deja-vu from last December, there was a messages exchange regarding mounting of 16TB devices.</div>
<div> </div>
<div>What if I am using single LVM for multiple flexible-meta-disk devices (flexible-meta-disk /dev/sda6[0...]) and later on I decide to resize/extend the corresponding DRBD partitions - will this be handled by DRBD correctly without any user intervention? Or -- from performance point of view -- would it be prefarable to dump/import all the metadata blocks after such change?</div>
<div> </div>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span id=""></span><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>
<br>DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.<br>__<br>please don't Cc me, but send to list -- I'm subscribed<br>_______________________________________________<br>drbd-user mailing list<br>
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