On 01/21/2011 12:10 AM, Carl Cook wrote: > On Thu 20 January 2011 14:13:22 Goffredo Baroncelli wrote: >> To add another disk you don't have to run mkfs.btrfs. For example: >> >> # add the first disk >> mkfs.btrfs /dev/sdb >> # mount the disk >> mount /dev/sdb /media/backups >> >> # add another disk to the first one >> btrfs device add /dev/sdc /media/backup > > Thanks Goffredo but as I say, I did this and it responds with > "ERROR: error adding the device '/dev/sdc'" > .. it doesn't give a clue.
In your email you wrote that before adding the device you format it. Anyway I don't think that this is the problem. Have you check which is reported in dmesg. > >> Note1: the filesystem has to be mounted >> Note2: the medatada will be in raid1, the data in raid0 >> If you shutdown the system, at the reboot you should "scan" all the >> device in order to find the btrfs ones >> >> # find the btrfs device >> btrfs device scan > > This must be done at every boot? If so, where is recommended, in rc.local? Look at this thread, where I wrote anout a possible solution http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg04709.html > > >> # if you try to mount snapshot-3 directly, you fail because this >> # snapshot is not under the root of the btrfs filesystem >> mount -o subvol=dir-1/snapshot-3 /dev/sdb /media/backup # -> error > > This is how I'd understood it, but when creating a subvolume in the root and > putting a snalshot into it, it seems to make a further subvolume (or > directory) with a redundant name. This would not be under the root, and may > not be mountable? > > >> Which kenel version debian testing uses ? > > 2.6.32-5-amd64 with Debian patches. >From a btrfs point of view, it is a very old kernel. IIRC in this kernel is not supported the snapshot removal. I suggest you to update the kernel with a recent one. > > >> btrfs filesystem snapshot / /snapshot-$(date +"%Y-%m-%d") > > Oh thank you. > > > > -- > 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 > . > -- 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
