31.3.2. VDO Efficiency 테스트

$ dd if=/dev/urandom of=/mnt/VDOVolume/testfile bs=4096 count=8388608

$ dd if=/mnt/VDOVolume/testfile of=/home/user/testfile bs=4096

$ diff -s /mnt/VDOVolume/testfile /home/user/testfile

$ dd if=/home/user/testfile of=/mnt/VDOVolume/testfile2 bs=4096

$ diff -s /mnt/VDOVolume/testfile2 /home/user/testfile

# umount /mnt/VDOVolume

# vdo remove --name=vdo0

# vdo list --all | grep vdo

$ mkdir /mnt/VDOVolume/vdo{01..10}

$ df -h /mnt/VDOVolume

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vdo0      1.5T  198M  1.4T   1% /mnt/VDOVolume

# vdostats --verbose | grep "blocks used"

data blocks used                : 1090
overhead blocks used            : 538846
logical blocks used             : 6059434

$ dd if=/dev/urandom of=/mnt/VDOVolume/sourcefile bs=4096 count=1048576

4294967296 bytes (4.3 GB) copied, 540.538 s, 7.9 MB/s

$ df -h /mnt/VDOVolume

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vdo0      1.5T  4.2G  1.4T   1% /mnt/VDOVolume

# vdostats --verbose | grep "blocks used"

data blocks used                : 1050093 (increased by 4GB)
overhead blocks used            : 538846 (Did not change)
logical blocks used             : 7108036 (increased by 4GB)

$ for i in {01..10}; do
  cp /mnt/VDOVolume/sourcefile /mnt/VDOVolume/vdo$i
  done

$ df -h /mnt/VDOVolume

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vdo0      1.5T   45G  1.3T   4% /mnt/VDOVolume

# vdostats --verbose | grep "blocks used"

data blocks used                : 1050836 (increased by 3M)
overhead blocks used            : 538846
logical blocks used             : 17594127 (increased by 41G)

# vdo create --name=vdo0 --device=/dev/sdb \
             --vdoLogicalSize=10G --verbose \
             --deduplication=disabled --compression=enabled

# vdostats --verbose | grep "blocks used"

# mkdir /mnt/VDOVolume
# mount /dev/mapper/vdo0 /mnt/VDOVolume && \
  chmod a+rwx /mnt/VDOVolume

# sync && dmsetup message vdo0 0 sync-dedupe

# vdostats --verbose | grep "blocks used"

# cp -vR /lib /mnt/VDOVolume

...
sent 152508960 bytes  received 60448 bytes  61027763.20 bytes/sec
total size is 152293104  speedup is 1.00

# sync && dmsetup message vdo0 0 sync-dedupe

# vdostats --verbose | grep "blocks used"

# umount /mnt/VDOVolume && vdo remove --name=vdo0

# fstrim /mnt/VDOVolume

$ df -m /mnt/VDOVolume

$ dd if=/dev/urandom of=/mnt/VDOVolume/file bs=1M count=1K

$ rm /mnt/VDOVolume/file