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Hi all,
this is a new attempt to improve the output of the command "btrfs fi df".
The previous attempt received a good reception. However there was no a
general consensus about the wording.
Moreover I still didn't understand how btrfs was using the disks.
A my first attempt was to develop a new command which shows how the
disks are divided in chunks.
Then after some thoughts I made three commands:
$ btrfs filesystem df <path>
# btrfs device disk-usage <path>
# btrfs filesystem disk-usage <path>
The first one shows only the section that before I called "Summary":
$ ./btrfs filesystem df /mnt/btrfs1/
Disk_size: 21.00GB
Disk_allocated: 1.83GB
Disk_unallocated: 19.17GB
Used: 284.00KB
Free_(Estimated): 15.76GB (Max: 20.54GB, min: 10.96GB)
Data_to_disk_ratio: 75 %
The second one show the chunk list grouped by devices:
$ sudo ./btrfs device disk-usage /mnt/btrfs1/
/dev/vdb 3.00GB
Data,Single: 8.00MB
Data,RAID0: 307.25MB
Metadata,Single: 8.00MB
Metadata,RAID1: 460.94MB
System,Single: 4.00MB
Unallocated: 2.23GB
/dev/vdc 3.00GB
Data,RAID0: 307.25MB
System,RAID1: 8.00MB
Unallocated: 2.69GB
/dev/vdd 3.00GB
Data,RAID0: 307.25MB
Metadata,RAID1: 460.94MB
System,RAID1: 8.00MB
Unallocated: 2.24GB
/dev/vdf 12.00GB
Unallocated: 12.00GB
The third one shows the devices grouped by chunk type; it has two kind
of output the first kind of output is a linear one (as before); the
second kind of output is in a tabular form. I don't like it because it
is suitable only when the filesystem uses few profile; otherwise this
output is larger than 80 columns.
$ sudo ./btrfs filesystem disk-usage /mnt/btrfs1/
Data,Single: Size:8.00MB, Used:0.00
/dev/vdb 8.00MB
Data,RAID0: Size:921.75MB, Used:256.00KB
/dev/vdb 307.25MB
/dev/vdc 307.25MB
/dev/vdd 307.25MB
Metadata,Single: Size:8.00MB, Used:0.00
/dev/vdb 8.00MB
Metadata,RAID1: Size:460.94MB, Used:24.00KB
/dev/vdb 460.94MB
/dev/vdd 460.94MB
System,Single: Size:4.00MB, Used:0.00
/dev/vdb 4.00MB
System,RAID1: Size:8.00MB, Used:4.00KB
/dev/vdc 8.00MB
/dev/vdd 8.00MB
Unallocated:
/dev/vdb 2.23GB
/dev/vdc 2.69GB
/dev/vdd 2.24GB
/dev/vdf 12.00GB
$ sudo ./btrfs filesystem disk-usage -t /mnt/btrfs1/
Data Data Metadata System System
Single RAID0 Single Single RAID1 Unused
vdb 8.00MB 307.25MB 8.00MB 4.00MB - 2.23GB
vdc - 307.25MB - - 8.00MB 2.69GB
vdd - 307.25MB - - 8.00MB 2.24GB
vdf - - - - - 12.00GB
========= ========= ========= ========= ========= =========
Total 8.00MB 921.75MB 8.00MB 4.00MB 8.00MB 19.17GB
Used 0.00 256.00KB 0.00 0.00 4.00KB
The latest output is a fake, because the original one requires 78-79
columns, so the email reader would rewrap it. I had to remove a column
(Metadata,RAID1) : this confirm me that this kind of output is
unusable as general case.
The code is pullable from
http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git
branch
info-cmd
I don't publish the patches because aren't in a good shape. The
example is a filesystem based on three disks of 3GB and one disk of 12 GB.
Comments are welcome.
Known bugs:
- - the commands btrfs fi disk-usage and btrfs device disk-usage need
root capability (I use the BTRFS_IOC_TREE_SEARCH
to get the chunk info; so that is unavoidable)
- --
gpg @keyserver.linux.it: Goffredo Baroncelli (kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5
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