Lutz Vieweg <lvml <at> 5t9.de> writes: > > On 06/30/2015 11:10 AM, David Weber wrote: > > I use Btrfs with regular snapshots on my workstation with Virtualbox since > > years. Running filefrag on the image doesn't complete after hours but the > > IO of the VM is still "fast enough". But the definition of "fast enough" > > can vary heavily. > > How do you backup the VM images? If filefrag takes hours to complete, > I'd assume that attempting a sequential read of the whole file (from a > backup software) takes just as long. I use send/receive. With an SSD it doesn't take that long. > > > If it becomes to slow I will try a btrfs fi deframent or just recreate the > > image with a no reflink copy. > > Chances are this will also take hours. A sequential read (dd if=Windows7.vdi of=/dev/zero bs=1M) gives nearly raw SSD Speed. But CPU consumption is indeed quite high... > > Regards, > > Lutz Vieweg -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
