Chris,
> Post 'btrfs fi usage' for the fileystem. That may give some insight
> what's expected to be on all the missing drives.
Here's the information, I believe that the missing we see in most
entries is the failed and absent drive, only the unallocated shows two
missing entries, the 2.73 TB is the missing but empty device. I don't
know if there's a way to prove it however.
ubuntu@btrfs-recovery:~$ sudo btrfs fi usage /mnt
Overall:
Device size: 15.45TiB
Device allocated: 12.12TiB
Device unallocated: 3.33TiB
Device missing: 5.46TiB
Used: 10.93TiB
Free (estimated): 2.25TiB (min: 2.25TiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID1: Size:6.04TiB, Used:5.46TiB
/dev/sda 2.61TiB
/dev/sdb 1.71TiB
/dev/sdc 1.72TiB
/dev/sdd 1.72TiB
/dev/sdf 1.71TiB
missing 2.61TiB
Metadata,RAID1: Size:14.00GiB, Used:11.59GiB
/dev/sda 8.00GiB
/dev/sdb 2.00GiB
/dev/sdc 3.00GiB
/dev/sdd 4.00GiB
/dev/sdf 3.00GiB
missing 8.00GiB
System,RAID1: Size:32.00MiB, Used:880.00KiB
/dev/sda 32.00MiB
missing 32.00MiB
Unallocated:
/dev/sda 111.49GiB
/dev/sdb 98.02GiB
/dev/sdc 98.02GiB
/dev/sdd 98.02GiB
/dev/sdf 98.02GiB
missing 111.49GiB
missing 2.73TiB
I tried to remove missing, first remove missing only removes the
2.73TiB missing entry seen above. All the other missing entries
remain.
I can't "replace", it's not a valid command on my btrfs tools version;
I upgraded btrfs this morning in order to have the btrfs fi usage
command.
ubuntu@btrfs-recovery:~$ sudo btrfs version
btrfs-progs v4.0
ubuntu@btrfs-recovery:~$ dpkg -l | grep btrfs
ii btrfs-tools 4.0-2
amd64 Checksumming Copy on Write Filesystem utilities
For those interested in my recovery techniques, here's how I rebuild
the overlay loop devices, be careful, these scripts make certain
assumptions that may not be accurate for your system:
On Client:
sudo umount /mnt
sudo /etc/init.d/open-iscsi stop
On Server:
/etc/init.d/iscsitarget stop
loop_devices=$(losetup -a | grep overlay | tr ":" " " | awk ' { printf
$1 " " } END { print "" } ')
for fn in /dev/mapper/sd??; do dmsetup remove $fn; done
for ln in $loop_devices; do losetup -d $ln; done
cd /home/ubuntu
rm sd*overlay
for device in sda3 sdb3 sdc1 sdd1 sde1 sdf1; do
dev=/dev/$device
ovl=/home/ubuntu/$device-overlay
truncate -s512M $ovl
newdevname=$device
size=$(blockdev --getsize "$dev")
loop=$(losetup -f --show -- "$ovl")
echo Setting up loop for $dev using overlay $ovl on loop $loop for
target $newdevname
printf '%s\n' "0 $size snapshot $dev $loop P 8" | dmsetup create "$newdevname"
done
Start the targets
/etc/init.d/iscsitarget start
On Client:
sudo /etc/init.d/open-iscsi start
-JohnF
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