I think I finally found the problem and a walk arround.
<div><br></div><div>If I start the process normaly:</div><div>/etc/init.d/cman start</div><div>/etc/init.d/clvmd start</div><div><br></div><div>And make the snapshots source volume of &quot;exclusive use&quot;:</div><div>
lvchange -an volume</div><div>lvchange -aey volume</div><div><br></div><div>And I try to remove a snapshot:</div><div>lvremove -f snapshot</div><div><br></div><div>The involved &quot;dm&quot; will get suspended but not deleted causing the eternal hang of the lvm system due to the blocked I/O .</div>
<div><br></div><div>Now. If BEFORE the &quot;lvremove&quot; I execute a built in clvmd restart:</div><div>clvmd -S</div><div><br></div><div>It will fail to restart it properly. Looking the code I think it is caused because clvmd is trying to pass itself &quot;-E&quot; option but in my current lvm2 version is not declared (2.02.87) . I don&#39;t know if I may report this to the lvm-devel :</div>
<div><br></div><div><div>[pid  2895] execve(&quot;/usr/sbin/clvmd&quot;, [&quot;clvmd&quot;, &quot;-E&quot;, &quot;fU6kuI1yVWxAjsu1WmL1TmvishGAZaZNH61u58pM21rrS3t8vyXvzsoiMaB4XHKX&quot;], [/* 0 vars */] &lt;unfinished ...&gt;</div>
</div><div>[pid  2892] write(2, &quot;Usage: clvmd [options]\n   -V       Show version of clvmd\n   -h       Show this help information\n   -d[n]    Set debug logging (0:none, 1:stderr (implies -f option), 2:syslog)\n   -f       Don&#39;t fork, run in the foreground\n   -R       Tell all running clvmd&quot;..., 611) = 611</div>
<div><br></div><div><br></div><div>Anyway. After the &quot;clvmd -S&quot; clvm will not be started, but I start it manually with &quot;/etc/init.d/clvmd start&quot;.</div><div>Now I have to mark the volume as exclusive again, but after that the lvm systems seems to work fine forever... I can create and delete snapshots without problems, without hanging the lvm.</div>
<div><br></div><div>It seems to me that the &quot;clvmd -S&quot; command does something that the system needs and the normal &quot;stop/start&quot; is not executing.</div><div><br></div><div><br></div>