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<p>I create a large data drive out of a bunch of small SSDs using
RAID and make that RAID drive an LVM PV.</p>
<p>I can then create LVM volume groups and volumes for each use (in
my case virtual drives for KVM) to back specific DRBD resources
for each VM. It allows me to have a DRBD resource for each VM,
each backed by an LVM volume which is in turn on a large LVM PV.</p>
<p>VM has DRBD resource as it's block device --> DRBD resources
backed by LVM volume --> LVM volume on a large RAID based
Physical Volume.</p>
<p>I can resize resources to my heart's content. :-)<br>
</p>
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<p><b>Paul O'Rorke</b><br>
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<div class="moz-cite-prefix">On 2018-05-01 07:38 AM, Yannis Milios
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFiF2Oo-RFq2oubMw9gKyCVdUxRQ7DdL2D0KBsaueJdKdN5B8w@mail.gmail.com">
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<div dir="ltr">I would prefer the 2nd option. Ideally all disks
would be members of a RAID(10?) array, with DRBD sitting on top
for the replication, and LVM for managing the volume.
<div>Another option would be ZFS managing the disks and the
volume, while DRBD sitting on top for the replication. This
very same scenario would also apply for LVM (thin or thick).</div>
<div>
<span
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">There's
no right or wrong, depends on what your needs are.</span>
<br>
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<div><br>
</div>
<div>I would avoid having single points of failure though, like
single drives in any case...</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, May 1, 2018 at 3:12 PM, Gandalf
Corvotempesta <span dir="ltr"><<a
href="mailto:gandalf.corvotempesta@gmail.com"
target="_blank" moz-do-not-send="true">gandalf.corvotempesta@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">Hi to all
<div dir="auto">Let's assume 3 servers with 12 disks each</div>
<div dir="auto">Would you create one resource per disk and
then manage them with something like LVM or a single
resource from a huge volume over all disks?</div>
</div>
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