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On 24/01/15 15:36, Hugo Mills wrote: > On Sat, Jan 24, 2015 at 03:32:44PM +0100, Daniel Pocock wrote: >> >> >> >> I've got a RAID1 on two 1TB partitions, /dev/sda3 and /dev/sdb3 >> >> I'm adding two new disks, they will have bigger partitions >> /dev/sdc3 and /dev/sdd3 >> >> I'd like the BtrFs to migrate from the old partitions to the new >> ones as safely and quickly as possible and if it is reasonable to >> do so, keeping it online throughout the migration. >> >> Should I do the following: >> >> btrfs device add /dev/sdc3 /dev/sdd3 /mnt/btrfs0 btrfs device >> delete /dev/sda3 /dev/sdb3 /mnt/btrfs0 >> >> or should I do it this way: >> >> btrfs device add /dev/sdc3 /mnt/btrfs0 btrfs device delete >> /dev/sda3 /mnt/btrfs0 btrfs device add /dev/sdd3 /mnt/btrfs0 >> btrfs device delete /dev/sdb3 /mnt/btrfs0 >> >> or is there some other way to go about it? > > btrfs replace start /dev/sda3 /dev/sdc3 /mountpoint btrfs fi resize > 3:max /mountpoint btrfs replace start /dev/sdb3 /dev/sdd3 > /mountpoint btrfs fi resize 4:max /mountpoint > > The 3 and 4 in the resize commands should be the devid of the > newly-added device. Thanks for the fast reply In the event of power failure, can I safely shutdown the server during this operation and resume after starting again? I get more than 2 hours runtime from the UPS but I suspect that migrating 1TB will take at least 12 hours. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Icedove - http://www.enigmail.net/ iQIcBAEBCAAGBQJUw7A+AAoJEOm1uwJp1aqDIuoQAKLkc0DgDj1bE6b6RPh6cnb9 lm+rjJD6aCo84dKZ3kVjaYCuUrFK5uXdj1D3ZrELD//jyjr6HbMK7CSJzuzfxmol rMRM0NaVb4RJ4WPuzbnUjT8pmNytisfP9oG1mV9JmJ+y6sZ2ApvOQwPyHpHWglSL D+H4clpOa3jXCeNoVxjm1eipLSWnnpSO4NVdXTIgBiHqUaR+LpKpUlh3QGtknvV/ uHegNuTJ+C4/Stp3hrzKy0/OUlIyzucFEXKPJbI/88XvMuZcL/XTO8FoHRP4r/vq qjICj4Dtjv+xOOe7WKT1Gw8wCz/66xMfSXIUSU02insfwfh0/fFpAS6XybKk4UsH i7LwswqduJMgFiVHv9bMvwyx3UdmhVJRotjGobVP3XPbI3GMSCEztXHdSGLOFE9D /IksBehi0XNw/YWOaLcoyA2XTXahBTcsTtktkZStrn5kKXvOPuE7LDyjkHq/o9W8 IYvti9Dvx2IicdJxRM7+5F6bKON2O7foDuSUJFd6/WAkrLVwdudurTqGDmk+uIdS kZVUVpehmdjYltUyb4wY/ATAvKnQTm/U18L04pSQIbdtdQZD7bAVl7PotLctgdHn xf7TokhjJZZmOk4C29m+uAQHy0gobDDXlPi3jtpO4Zj+CR9pXM1/+oa40xhWh4Eh WtDofKi5z7BLVYFNqIix =BR1V -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
