Lars, It'd be nice to see this well-documented (setting up the low-level device with internal meta-data)<br><br>Perhaps a step-by-step (command by command) example of how to properly set one up.<br><br>Since so many people get this wrong, what's wrong with putting up a small example, keep it simple?<br>
<br>Say you have a whole drive you want to dedicate (eg: /dev/sdb1 ) and want to use internal meta-data.<br>You want to use as much as possible for the data, and reserve only enough for the meta-data<br><br>What exact commands (for drbd v8) should a person use to set it up?<br>
Something like this (please correct if wrong (using /data as example) --<br><br>/etc/init.d/drbd start<br>mkdir /data<br>drbdadm create-md all<br>drbdadm up all<br>mkfs -t reiserfs /dev/drbd0<br>mount -t rieserfs /dev/drbd0 /data<br>
<br>Notice, no underlying partition created. Is this correct?<br><br>Dan.<br><br><div class="gmail_quote">On Thu, Feb 14, 2008 at 8:32 AM, Lars Ellenberg <<a href="mailto:lars.ellenberg@linbit.com">lars.ellenberg@linbit.com</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">On Wed, Feb 13, 2008 at 07:29:47AM -0800, yoyo64 wrote:<br>
><br>
> Hi<br>
><br>
> I use internal metadata, for my resources<br>
<br>
> Is it the best choice for big amount of datas ?<br>
<br>
</div>depends on your definition of "best". :)<br>
depends on what your storage subsystem is.<br>
<br>
if you have some good raid,<br>
the difference is more administratively.<br>
<br>
on good raid, it should not differ<br>
that much performance wise/technically.<br>
<br>
> What is the limit ?<br>
<br>
depends on a lot of factors, mainly what kernel,<br>
what architecture, and the amount of RAM.<br>
<br>
> Why to choice external ?<br>
<br>
drbd external meta data makes resizing much easier.<br>
<br>
it also avoids any issues with the file system being<br>
smaller than the lower level device, because you have<br>
to leave room for the drbd meta data.<br>
many people got this one wrong.<br>
<div class="Ih2E3d"><br>
<br>
> How do I do for transfering my devices from internal to external ?<br>
<br>
</div>in theory:<br>
drbdadm dump-md<br>
# reconfigure<br>
drbdadm restore-md<br>
<font color="#888888"><br>
--<br>
: Lars Ellenberg <a href="http://www.linbit.com" target="_blank">http://www.linbit.com</a> :<br>
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