Hallo, Hugo, Du meintest am 26.02.12:
>>> What you need to do is, immediately after >>> removing a device from the FS, zero the first part of the partition >>> with dd and /dev/zero. >> >> Ok - I'll try again (not today ...). >> If I remember correct in early times deleting only the first block >> of the partition didn't reach ... > No, it won't -- the first superblock on btrfs is at 64k into the > device. Most filesystems do something similar, because there's other > things that occasionally put metadata in the first part of the > device, so it avoids having the FS's superblock overwritten > accidentally. Ok - but deleting the first 100 kByte or the first 1 MByte does reach? Last times I'd run a job which deleted all (but that's nasty for disks with much more than 100 GByte ...) >> mkfs.btrfs -L SCSI /dev/sdk1 >> >> seemed to work. >> >> mount LABEL=SCSI /mnt/btr >> >> worked as expected, the bundle of 3 partitions was mounted. And only >> "/ dev/sdk1" got this label, no other partition. > That's because you've just destroyed part of the original > filesystem that was on /dev/sd[klm]1 and created a new single-device > filesystem on /dev/sdk1. > mkfs.btrfs creates a new filesystem. The -L option sets the label > for the newly-created FS. It *cannot* be used to change the label of > an existing FS. If you want to do that, use "btrfs filesystem label". Hmmmm - I'll try ... Thank you! ------------------------------------- Label: 'SCSI' uuid: 8e287956-d73f-46cb-8938-b00315c596c6 Total devices 1 FS bytes used 92.00KB devid 1 size 136.73GB used 2.04GB path /dev/sdj1 Label: 'Scsi' uuid: b59caf71-1a38-47cc-bad3-c2d87357c971 Total devices 3 FS bytes used 9.09GB devid 2 size 136.73GB used 4.01GB path /dev/sdl1 devid 3 size 68.37GB used 5.01GB path /dev/sdm1 devid 1 size 16.96GB used 5.02GB path /dev/sdk1 Btrfs Btrfs v0.19 looks good ... Viele Gruesse! Helmut -- 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