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From: Chris Murphy <lists@colorremedies.com>
To: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: VM nocow, should VM software set +C by default?
Date: Fri, 21 Feb 2014 09:55:50 -0700	[thread overview]
Message-ID: <A2EE3F12-97D9-46CD-8360-ACCFF71F149B@colorremedies.com> (raw)

Use case is a user who doesn't know that today xattr +C ought to be set on vm images when on Btrfs. They use e.g. Gnome Boxes, or Virtual Machine Manager (virt-manager) to configure pools, images, and VMs.

If libvirt were to set +C on any containing directory configured as a pool, then any copied as well as newly created images would inherit +C. So is this the long term recommended practice, and should various VM projects be asked to build this functionality? Or will there be optimizations, such as autodefrag, that will obviate the need for +C on such VM images in the somewhat near future?


Chris Murphy

             reply	other threads:[~2014-02-21 16:55 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-21 16:55 Chris Murphy [this message]
2014-02-21 17:56 ` VM nocow, should VM software set +C by default? Duncan
2014-02-25  9:16 ` Justin Ossevoort
2014-02-25 17:44   ` Chris Murphy
2014-02-25 17:53     ` Jim Salter
2014-02-25 18:33       ` Chris Murphy
2014-02-26  5:43         ` Duncan
2014-02-25 18:01     ` Roman Mamedov

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