Re: How to replicate a Xen VM using BTRFS as the root filesystem.

[Austin S Hemmelgarn <ahferroin7@gmail.com>]

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On 2015-10-28 22:39, Russell Coker wrote:
> On Wed, 28 Oct 2015 11:07:20 PM Austin S Hemmelgarn wrote:
>> Using this methodology, I can have a new Gentoo PV domain running in
>> about half an hour, whereas it takes me at least two and a half hours
>> (and often much longer than that) when using the regular install process
>> for Gentoo.
>
> On my virtual servers I have a BTRFS subvol /xenstore for the block devices of
> virtual machines.  When I want to duplicate a VM I run
> "cp -a --reflink=aways /xenstore/A /xenstore/B" which takes a few seconds.
Well yes, that works quickly too, but is kind of hard to do when using 
LVM or other non-file-backed block storage, and the usual recommendation 
when not using blktap for storage is to use normal block storage devices 
(that, and I've had some horrible experience WRT performance with 
running VM's with BTRFS filesystems on files on a BTRFS filesystem on 
the host system).



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