output

gistfile1.txt

+ ceph version
ceph version 17.2.6 (d7ff0d10654d2280e08f1ab989c7cdf3064446a5) quincy (stable)
+ echo ext4
ext4
+ rbd create goller-test-image --size 800GB
+ rbd map goller-test-image
/dev/rbd0
+ mkfs -t ext4 /dev/rbd0
mke2fs 1.46.2 (28-Feb-2021)
Discarding device blocks: done
Creating filesystem with 209715200 4k blocks and 52428800 inodes
Filesystem UUID: f96df9bb-2e73-47b3-8dfa-8b6ee547a43f
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000

Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

+ sleep 10
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  17 MiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.6 GiB
+ mount /dev/rbd0 /mnt
+ dd if=/dev/urandom of=/mnt/1g.bin bs=64M count=16
16+0 records in
16+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.73258 s, 288 MB/s
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.4 GiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  2.6 GiB
+ rm /mnt/1g.bin
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.8 GiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  2.6 GiB
+ fstrim -v /mnt
/mnt: 786.4 GiB (844362543104 bytes) trimmed
+ fstrim -v /mnt
/mnt: 0 B (0 bytes) trimmed
+ fstrim -v /mnt
/mnt: 0 B (0 bytes) trimmed
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  922 MiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  2.1 GiB
+ umount /mnt
+ rbd unmap goller-test-image
+ rbd rm goller-test-image
Removing image: 100% complete...done.
+ echo xfs
xfs
+ rbd create goller-test-image --size 800GB
+ rbd map goller-test-image
/dev/rbd0
+ mkfs -t xfs -f /dev/rbd0
meta-data=/dev/rbd0              isize=512    agcount=32, agsize=6553600 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1    bigtime=0
data     =                       bsize=4096   blocks=209715200, imaxpct=25
         =                       sunit=16     swidth=16 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=102400, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
Discarding blocks...Done.
+ sleep 10
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  5.0 MiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  132 MiB
+ mount /dev/rbd0 /mnt
+ dd if=/dev/urandom of=/mnt/1g.bin bs=64M count=16
16+0 records in
16+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.43663 s, 312 MB/s
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.0 GiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.1 GiB
+ rm /mnt/1g.bin
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.0 GiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.1 GiB
+ fstrim -v /mnt
/mnt: 799.6 GiB (858572636160 bytes) trimmed
+ fstrim -v /mnt
/mnt: 799.6 GiB (858572636160 bytes) trimmed
+ fstrim -v /mnt
/mnt: 799.6 GiB (858572636160 bytes) trimmed
+ sleep 30
+ rbd du --exact goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  40 MiB
+ rbd du goller-test-image
NAME               PROVISIONED  USED
goller-test-image      800 GiB  1.1 GiB
+ umount /mnt
+ rbd unmap goller-test-image
+ rbd rm goller-test-image
Removing image: 100% complete...done.