On Mon, Apr 10, 2017 at 06:41:08AM +0100, Wols Lists wrote: >On 08/04/17 22:42, LM wrote: >> Hi, >> >> I have a 4 disk RAID5, the used dev size is 640.05 GB. Now I want to >> replace the 4 disks by 4 disks with a size of 2TB each. >> >> As far as I understand the man page, this can be achieved by replacing >> the devices one after another and for each device rebuild the degraded >> array with: >> >> mdadm /dev/md0 --add /dev/sdX1 > >Do you have a spare SATA port or whatever your drives are. If so, then >use the --replace option to mdadm, don't fail then add. You're risking a >drive failure taking out your array - not a good move. > >And if you don't have a spare port, $20 for a PCI card or whatever is a >good investment to keep your data safe. > >Have a look at the raid wiki - it tries to be a bit more verbose and >easily comprehensible than the man page. > >Cheers, >Wol Thx for hinting me at --replace, I missed it. Yes, I have a spare SATA port. I successfully tested it using loop devices: mdadm /dev/md/test --add-spare /dev/loop20 --replace /dev/loop10 --with /dev/loop20 mdadm /dev/md/test --add-spare /dev/loop21 --replace /dev/loop11 --with /dev/loop21 mdadm /dev/md/test --add-spare /dev/loop22 --replace /dev/loop12 --with /dev/loop22 mdadm /dev/md/test --add-spare /dev/loop23 --replace /dev/loop13 --with /dev/loop23 mdadm /dev/md/test --remove /dev/loop10 /dev/loop11 /dev/loop12 /dev/loop13 mdadm --grow /dev/md/test --size max mdadm --grow /dev/md/test --level=6 --raid-disk=4 --backup-file=/root/backup-md-test --force mdadm --grow /dev/md/test --array-size 407552 mdadm --grow /dev/md/test --raid-disk=4 --layout=normalise --backup-file=/root/backup-md-test -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
