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<blockquote cite="mid:20160706153548.5365844.14226.20685@wenn.com"
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<div><b>From: </b>Gandalf Corvotempesta</div>
<div><b>Sent: </b>Wednesday, 6 July 2016 16:28</div>
<div><b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a></div>
<div><b>Subject: </b>[DRBD-user] nfs for VMs hosting</div>
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<p dir="ltr">Anyone using drbd to export an high available
volume with nfs for virtual machine hosting?</p>
<p dir="ltr">Currently i have 2 or 3 supermicro servers with 12
SAS 15k disks each.<br>
I would like to use them as nfs server where store VM images</p>
<p dir="ltr">Any suggestions?<br>
Should i create a big raid10 with 12 disks? Multiple raid1
merged with lvm?<br>
A raid6?</p>
<p dir="ltr">I'm open to suggestions. I need the maximum
availability and data protection</p>
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<br>
If you need maximum availability and data protection, why would you
even ask about RAID6 ? You have 12 disks, the chance of losing *any*
3 disks in RAID6 is much higher than the chance of losing a pair of
disks in RAID10 (IMHO). Also, if performance is a concern, then I'd
also focus on RAID10.<br>
<br>
For maximum availability, I'd suggest to keep your stack as simple
as possible, so don't include lvm if you don't need it, just use MD
or hardware RAID. Your problem is that you probably want high
performance, high availability, and data protection, and finally
probably cost is a factor too. Getting all of that together will be
a massive headache.<br>
<br>
You need to work out what your work-load is first (ie, large
streaming read/write or small random read/write, for multiple VM's,
most likely small random read/write). Then you need to run all your
tests with that type of work load while you tune/test multiple
configurations (eg, RAID10, RAID6, NFS server, iSCSI instead,
etc...) as well as all the DRBD tuning, network tuning, etc...<br>
<br>
Hope that helps.<br>
<br>
Regards,<br>
Adam<br>
<div class="moz-signature">-- <br>
Adam Goryachev
Website Managers
<a class="moz-txt-link-abbreviated" href="http://www.websitemanagers.com.au">www.websitemanagers.com.au</a></div>
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