zfs-test/README.md

zfs-test

Scripts for trying out how ZFS works in some simple scenarios.

I ran these scripts on a VM. They will modify the ZFS pool named tank, which is the default pool name in ZFS examples, so may be a valid ZFS pool name on your system.

# Create a test pool named tank backed by a the file /root/tank
fallocate -l 1G /root/tank
zpool create tank /root/tank

cd zfs-test/bin
# dump logs from create-and-measure / copy-all-and-measure into ../logs/
./measure-all
# read ../logs/ and print Markdown table of dataset space used below
./logs-to-table --links

The rows are which script from bin/create-test-setup/ was used to create the tank/test dataset. The columns are which script from bin/copy-snapshot/ was used to copy each snapshot into tank/target. The cells are the space used by the tank/target (or test/test for the first column) dataset for that combination.

Create script	orig	rsync-ahvx	rsync-ahvx-sparse	rsync-inplace	rsync-inplace-no-whole-file	rsync-no-whole-file	zfs-diff-move-then-rsync
edit-part-of-file	1.16M	2.04M❌	2.04M❌	2.04M❌	1.17M✅	2.04M❌	1.17M✅
empty	24K	24K✅	24K✅	24K✅	24K✅	24K✅	24K✅
encrypted-nested	1.84M	24K✅	24K✅	24K✅	24K✅	24K✅	24K✅
move-file	1.04M	2.04M❌	2.04M❌	2.04M❌	2.04M❌	2.04M❌	1.04M✅
random-1M-file	1.03M	1.03M✅	1.03M✅	1.03M✅	1.03M✅	1.03M✅	1.03M✅
zeros-1M-file	24K	1.03M❌	24K✅	1.03M❌	1.03M❌	1.03M❌	1.03M❌