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<p>Hi list,</p>
<p>I have an LVM backed DRBD resource for a libvirt VM that I wish
to reduce in size however neither lvresize nor resize2fs are
working for me.</p>
<p>backing device for the volume is <b>/dev/trk-kvm-02-vg/blmail</b>
and is currently 300G and I want to bring it down to 30G. My
intended use for this server has changed.<br>
</p>
<blockquote>
<p><tt>root@trk-kvm-02:~/scripts# lvs</tt><tt><br>
</tt><tt> LV VG Attr LSize
Pool Origin Data% Meta% Move Log Cpy%Sync Convert</tt><tt><br>
</tt><tt> [...]</tt><tt><br>
</tt><tt> blmail trk-kvm-02-vg -wi-a----- 300.00g </tt><tt><br>
</tt><tt> [...]</tt></p>
</blockquote>
<p>I bring down the resource and try lvresize on
/dev/trk-kvm-02-vg/blmail:<br>
</p>
<div class="moz-signature">
<blockquote><tt>root@trk-kvm-02:~/scripts# lvreduce --resizefs -L
30G /dev/trk-kvm-02-vg/blmail</tt><br>
<tt>fsck from util-linux 2.27.1</tt><br>
<tt>fsadm: Filesystem "drbd" on device
"/dev/mapper/trk--kvm--02--vg-blmail" is not supported by this
tool</tt><br>
<tt> fsadm failed: 1</tt><br>
<tt> Filesystem resize failed.</tt><br>
</blockquote>
So I thought I'd use a hammer and resize the file system and dd it
onto a new smaller LVM volume and recreate new drbd meta-data if
needed:<br>
<blockquote><tt>root@trk-kvm-02:~/scripts# resize2fs
/dev/trk-kvm-02-vg/blmail 30G</tt><br>
<tt>resize2fs 1.42.13 (17-May-2015)</tt><br>
<tt>resize2fs: Bad magic number in super-block while trying to
open /dev/trk-kvm-02-vg/blmail</tt><br>
<tt>Couldn't find valid filesystem superblock.</tt><br>
</blockquote>
I would seem to be barking up the wrong tree. Can anyone point me
in the right direction for documentation or suggest what is the
right approach to reducing this volume?<br>
<br>
please and thanks<br>
<br>
-- <br>
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<p><b>Paul O'Rorke</b><br>
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