<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p><br>
</p>
<div class="moz-cite-prefix">On 21/6/21 12:21, Eric Robinson wrote:<br>
</div>
<blockquote type="cite"
cite="mid:SA2PR03MB58849E04E74458CD87283C15FA0A9@SA2PR03MB5884.namprd03.prod.outlook.com">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
<style>@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}div.WordSection1
{page:WordSection1;}</style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">I have a filesystem directly on a drbd
disk, and the drbd disk has an LVM volumes as a backing
device. It looks like this…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">lvm volume<o:p></o:p></p>
<p class="MsoNormal"> drbd disk<o:p></o:p></p>
<p class="MsoNormal"> ext4
filesystem<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I can snapshot the backing device, mount
it, and explore the filesystems.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However, I recently started experimenting
with vdo, so now the stack looks like this….<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">lvm volume<o:p></o:p></p>
<p class="MsoNormal"> drbd disk<o:p></o:p></p>
<p class="MsoNormal"> vdo disk<o:p></o:p></p>
<p class="MsoNormal">
ext4 filesystem<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I snapshot the backing device, I can
no longer mount it because it complains that vdo is an unknown
filesystem type. Any ideas how I can mount the vdo disk from
the snapshot?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
<p>Makes sense..... I guess you would need to refer to the VDO docs
to find out what you need to do to make a snapshot of a VDO device
appear as a proper/normal block device, and then mount the
filesystem from that block device.</p>
<p>Very similar to if you used encryption between the DRBD disk and
the filesystem, you would need to make the decrypted block device
available, and then mount that....<br>
</p>
<p>Regards,<br>
Adam<br>
</p>
</body>
</html>