Hi,
I pushed a subvolume using send/receive to an 8 TB disk, added
two 4 TB disks and started a balance with conversion to RAID1.
Afterwards, I got the following:
Total devices 3 FS bytes used 5.40TiB
devid 1 size 7.28TiB used 4.54TiB path /dev/mapper/yellow4
devid 2 size 3.64TiB used 3.17TiB path /dev/mapper/yellow1
devid 3 size 3.64TiB used 3.17TiB path /dev/mapper/yellow2
Btrfs v3.17
Data, RAID1: total=5.43TiB, used=5.39TiB
System, RAID1: total=64.00MiB, used=800.00KiB
Metadata, RAID1: total=14.00GiB, used=5.55GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
In my understanding, the data isn't properly balanced and I
only get around 5.9TB of usable space. As suggested in #btrfs,
I started a second balance without filters and got this:
Total devices 3 FS bytes used 5.40TiB
devid 1 size 7.28TiB used 5.41TiB path /dev/mapper/yellow4
devid 2 size 3.64TiB used 2.71TiB path /dev/mapper/yellow1
devid 3 size 3.64TiB used 2.71TiB path /dev/mapper/yellow2
Data, RAID1: total=5.41TiB, used=5.39TiB
System, RAID1: total=32.00MiB, used=784.00KiB
Metadata, RAID1: total=7.00GiB, used=5.54GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
/dev/mapper/yellow4 7,3T 5,4T 969G 86% /mnt/yellow
Now, I get 6.3TB of usable space but, in my understand, I should
get around 7.28 TB or am I missing something here? Also, a second
balance shouldn't change the data distribution, right?
I'm using kernel v4.3 with a patch [1] from kernel bugzilla [2] for
the 8 TB SMR drive. The send/receive of a 5 TB subvolume worked
flawlessly with the patch. Without, I got a lot of errors in dmesg
within the first 200GB of transferred data. The OS is a x86_64
Ubuntu 15.04.
Thank you!
Mario
[1]
http://git.kernel.org/cgit/linux/kernel/git/mkp/linux.git/commit/?h=bugzilla-93581&id=7c4fbd50bfece00abf529bc96ac989dd2bb83ca4
[2] https://bugzilla.kernel.org/show_bug.cgi?id=93581
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