Hi!
On 3.17, i.e. since the size reporting changes, I get:
merkaba:~> LANG=C df -hT -t btrfs
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/sata-debian btrfs 30G 19G 21G 48% /
/dev/mapper/sata-debian btrfs 30G 19G 21G 48% /mnt/debian-zeit
/dev/mapper/msata-daten btrfs 200G 185G 15G 93% /daten
/dev/mapper/msata-home btrfs 160G 135G 48G 75% /mnt/home-zeit
/dev/mapper/msata-home btrfs 160G 135G 48G 75% /home
I wonder about used and avail not adding up to total size of filesystem:
19+21 = 40 GiB instead of 30 GiB for / and 135+48 = 183 GiB for /home.
Only /daten seems to be correct.
/ and /home are RAID 1 spanning two SSDs. /daten is single.
I wondered about compression taken into account? They use compress=lzo.
While /daten has also compress=lzo, it contains mostly incompressible data
like jpeg images and mp3, ogg vorbis and probably some flac music files as
well one or the other mp4 video file, compressed media data that is.
Any explaination for the discrepancy, can it just be due to the compression?
/home has large maildir and lots of source files… which I expect to compress
well. Also a debian installation may contain quite an amount of compressible
data. But still… the ratio seems a bit off. As it means it would have been
able to store 19 GiB of data within 9 GiB of actual disk space for / which
would be a quite high compression ratio for LZO.
merkaba:~> mount | grep btrfs
/dev/mapper/sata-debian on / type btrfs
(rw,noatime,compress=lzo,ssd,space_cache)
/dev/mapper/sata-debian on /mnt/debian-zeit type btrfs
(rw,noatime,compress=lzo,ssd,space_cache)
/dev/mapper/msata-daten on /daten type btrfs
(rw,noatime,compress=lzo,ssd,space_cache)
/dev/mapper/msata-home on /mnt/home-zeit type btrfs
(rw,noatime,compress=lzo,ssd,space_cache)
/dev/mapper/msata-home on /home type btrfs
(rw,noatime,compress=lzo,ssd,space_cache)
merkaba:~> btrfs fi sh
Label: 'debian' uuid: […]
Total devices 2 FS bytes used 18.47GiB
devid 1 size 30.00GiB used 30.00GiB path /dev/mapper/sata-debian
devid 2 size 30.00GiB used 30.00GiB path /dev/mapper/msata-debian
Label: 'daten' uuid: […]
Total devices 1 FS bytes used 184.82GiB
devid 1 size 200.00GiB used 188.02GiB path /dev/mapper/msata-daten
Label: 'home' uuid: […]
Total devices 2 FS bytes used 134.39GiB
devid 1 size 160.00GiB used 160.00GiB path /dev/mapper/msata-home
devid 2 size 160.00GiB used 160.00GiB path /dev/mapper/sata-home
merkaba:~> btrfs fi df /
Data, RAID1: total=27.99GiB, used=17.84GiB
System, RAID1: total=8.00MiB, used=16.00KiB
Metadata, RAID1: total=2.00GiB, used=645.88MiB
unknown, single: total=224.00MiB, used=0.00
merkaba:~> btrfs fi df /home
Data, RAID1: total=154.97GiB, used=131.46GiB
System, RAID1: total=32.00MiB, used=48.00KiB
Metadata, RAID1: total=5.00GiB, used=2.93GiB
unknown, single: total=512.00MiB, used=0.00
merkaba:~> btrfs fi df /daten
Data, single: total=187.01GiB, used=184.53GiB
System, single: total=4.00MiB, used=48.00KiB
Metadata, single: total=1.01GiB, used=292.31MiB
unknown, single: total=112.00MiB, used=0.00
merkaba:~> LANG=C strace df -hT -t btrfs
execve("/bin/df", ["df", "-hT", "-t", "btrfs"], [/* 55 vars */]) = 0
brk(0) = 0x13c2000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e7de000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=250673, ...}) = 0
mmap(NULL, 250673, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f795e7a0000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\34\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1725888, ...}) = 0
mmap(NULL, 3832352, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f795e218000
mprotect(0x7f795e3b7000, 2093056, PROT_NONE) = 0
mmap(0x7f795e5b6000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19e000) = 0x7f795e5b6000
mmap(0x7f795e5bc000, 14880, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f795e5bc000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e79f000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e79e000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e79d000
arch_prctl(ARCH_SET_FS, 0x7f795e79e700) = 0
mprotect(0x7f795e5b6000, 16384, PROT_READ) = 0
mprotect(0x616000, 4096, PROT_READ) = 0
mprotect(0x7f795e7e0000, 4096, PROT_READ) = 0
munmap(0x7f795e7a0000, 250673) = 0
brk(0) = 0x13c2000
brk(0x13e3000) = 0x13e3000
open("/etc/mtab", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e7dd000
read(3, "rootfs / rootfs rw 0 0\nsysfs /sy"..., 1024) = 1024
read(3, "0 0\ncgroup /sys/fs/cgroup/memory"..., 1024) = 1024
read(3, "mapper/sata-debian /mnt/debian-z"..., 1024) = 496
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7f795e7dd000, 4096) = 0
stat("/", {st_mode=S_IFDIR|0755, st_size=306, ...}) = 0
stat("/sys", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/dev", {st_mode=S_IFDIR|0755, st_size=3820, ...}) = 0
stat("/dev/pts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/run", {st_mode=S_IFDIR|0755, st_size=1140, ...}) = 0
stat("/", {st_mode=S_IFDIR|0755, st_size=306, ...}) = 0
stat("/sys/kernel/security", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
stat("/run/lock", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=120, ...}) = 0
stat("/sys/fs/cgroup", {st_mode=S_IFDIR|0755, st_size=320, ...}) = 0
stat("/sys/fs/cgroup/systemd", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/pstore", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpu,cpuacct", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/devices", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/freezer", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/net_cls,net_prio", {st_mode=S_IFDIR|0555, st_size=0, ...})
= 0
stat("/sys/fs/cgroup/blkio", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/perf_event", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc/sys/fs/binfmt_misc", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/hugepages", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/mqueue", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
stat("/sys/kernel/debug", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
stat("/sys/fs/fuse/connections", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=760, ...}) = 0
stat("/boot", {st_mode=S_IFDIR|0755, st_size=3072, ...}) = 0
stat("/mnt/debian-zeit", {st_mode=S_IFDIR|0755, st_size=12, ...}) = 0
stat("/daten", {st_mode=S_IFDIR|0755, st_size=30, ...}) = 0
stat("/mnt/home-zeit", {st_mode=S_IFDIR|0755, st_size=8, ...}) = 0
stat("/home", {st_mode=S_IFDIR|0755, st_size=124, ...}) = 0
stat("/proc/sys/fs/binfmt_misc", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/run/user/1000", {st_mode=S_IFDIR|0700, st_size=120, ...}) = 0
uname({sys="Linux", node="merkaba", ...}) = 0
statfs("/", {f_type=0x9123683e, f_bsize=4096, f_blocks=7864320,
f_bfree=2964122, f_bavail=5320460, f_files=0, f_ffree=0, f_fsid={1441862335,
1668422792}, f_namelen=255, f_frsize=4096}) = 0
stat("/", {st_mode=S_IFDIR|0755, st_size=306, ...}) = 0
statfs("/mnt/debian-zeit", {f_type=0x9123683e, f_bsize=4096, f_blocks=7864320,
f_bfree=2964122, f_bavail=5320460, f_files=0, f_ffree=0, f_fsid={1441862335,
1668423053}, f_namelen=255, f_frsize=4096}) = 0
stat("/mnt/debian-zeit", {st_mode=S_IFDIR|0755, st_size=12, ...}) = 0
statfs("/daten", {f_type=0x9123683e, f_bsize=4096, f_blocks=52428800,
f_bfree=3951188, f_bavail=3789488, f_files=0, f_ffree=0, f_fsid={-1029141028,
226079861}, f_namelen=255, f_frsize=4096}) = 0
stat("/daten", {st_mode=S_IFDIR|0755, st_size=30, ...}) = 0
statfs("/mnt/home-zeit", {f_type=0x9123683e, f_bsize=4096, f_blocks=41943040,
f_bfree=6582413, f_bavail=12322874, f_files=0, f_ffree=0, f_fsid={493729996,
1996367843}, f_namelen=255, f_frsize=4096}) = 0
stat("/mnt/home-zeit", {st_mode=S_IFDIR|0755, st_size=8, ...}) = 0
statfs("/home", {f_type=0x9123683e, f_bsize=4096, f_blocks=41943040,
f_bfree=6582413, f_bavail=12322874, f_files=0, f_ffree=0, f_fsid={493729996,
1996367590}, f_namelen=255, f_frsize=4096}) = 0
stat("/home", {st_mode=S_IFDIR|0755, st_size=124, ...}) = 0
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f795e7dd000
write(1, "Filesystem Type S"..., 64Filesystem Type
Size Used Avail Use% Mounted on
) = 64
write(1, "/dev/mapper/sata-debian btrfs "..., 55/dev/mapper/sata-debian btrfs
30G 19G 21G 48% /
) = 55
write(1, "/dev/mapper/sata-debian btrfs "..., 70/dev/mapper/sata-debian btrfs
30G 19G 21G 48% /mnt/debian-zeit
) = 70
write(1, "/dev/mapper/msata-daten btrfs 2"..., 60/dev/mapper/msata-daten btrfs
200G 185G 15G 93% /daten
) = 60
write(1, "/dev/mapper/msata-home btrfs 1"..., 68/dev/mapper/msata-home btrfs
160G 135G 48G 75% /mnt/home-zeit
) = 68
write(1, "/dev/mapper/msata-home btrfs 1"..., 59/dev/mapper/msata-home btrfs
160G 135G 48G 75% /home
) = 59
close(1) = 0
munmap(0x7f795e7dd000, 4096) = 0
close(2) = 0
exit_group(0) = ?
+++ exited with 0 +++
Ciao,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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