Summary: After successfully completed btrfs replace start, btrfs fi show lists
the old devid size not the new devid size.
kernel-3.17.2-300.fc21.x86_64
btrfs-progs-3.17-1.fc21.x86_64
##Before devid2 is missing (normal mount of 2x HDDs, raw block devices are
formatted, no partitioning)
#btrfs fi show /mnt/btrfs1
Label: 'btrfs1' uuid: 0f1c615f-30a0-4166-8a3c-987849551513
Total devices 2 FS bytes used 270.58GiB
devid 1 size 465.76GiB used 272.03GiB path /dev/sdc
devid 2 size 298.09GiB used 272.03GiB path /dev/sdb
##During btrfs replace start 2 /dev/sdb /mnt/btrfs1; new /dev/sdb is 750GB
#btrfs fi show /mnt/btrfs1
Label: 'btrfs1' uuid: 0f1c615f-30a0-4166-8a3c-987849551513
Total devices 4 FS bytes used 270.58GiB
devid 0 size 298.09GiB used 272.03GiB path /dev/sdb
devid 1 size 465.76GiB used 272.03GiB path /dev/sdc
*** Some devices missing
##After btrfs replace completes, and after umount, physically
disconnecting/reconnecting, and remounting
Label: 'btrfs1' uuid: 0f1c615f-30a0-4166-8a3c-987849551513
Total devices 2 FS bytes used 270.58GiB
devid 1 size 465.76GiB used 272.03GiB path /dev/sdc
devid 2 size 298.09GiB used 272.03GiB path /dev/sdb
devid2/sdb is now the new device (750GB, 698.7GiB as reported by lsblk). The
value from btrfs fi show is still the old value and is now wrong.
[ 6141.864212] usb 4-2: USB disconnect, device number 5
[ 6141.865378] sd 9:0:0:0: [sdb] Synchronizing SCSI cache
[ 6141.865448] sd 9:0:0:0: [sdb]
[ 6141.865452] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[ 6145.254144] usb 4-1: new SuperSpeed USB device number 6 using xhci_hcd
[ 6145.266077] usb 4-1: New USB device found, idVendor=174c, idProduct=5136
[ 6145.266084] usb 4-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 6145.266088] usb 4-1: Product: AS2105
[ 6145.266090] usb 4-1: Manufacturer: ASMedia
[ 6145.266093] usb 4-1: SerialNumber: 00000000000000000000
[ 6145.266861] usb-storage 4-1:1.0: USB Mass Storage device detected
[ 6145.267536] scsi host10: usb-storage 4-1:1.0
[ 6146.271397] scsi 10:0:0:0: Direct-Access ASMT 2105 0
PQ: 0 ANSI: 6
[ 6146.272183] sd 10:0:0:0: Attached scsi generic sg2 type 0
[ 6148.239288] sd 10:0:0:0: [sdb] 1465149168 512-byte logical blocks: (750
GB/698 GiB)
[ 6148.239748] sd 10:0:0:0: [sdb] Write Protect is off
[ 6148.239755] sd 10:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 6148.240077] sd 10:0:0:0: [sdb] Write cache: enabled, read cache: enabled,
doesn't support DPO or FUA
[ 6148.265774] sdb: unknown partition table
[ 6148.267153] sd 10:0:0:0: [sdb] Attached SCSI disk
# df -h
/dev/sdc 382G 271G 27G 92% /mnt/btrfs1
This is incorrect as well, it's the exact same information provided by df
before the replace. It seems like btrfs replace is not doing a resize to fill
all available space on the specified new block device.
Chris Murphy
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