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tromcho.net/tests/test_snapshot_chain.sh

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#!/bin/bash -ex
. `dirname $0`/run_3osds.sh
check_qemu
# Test multiple snapshots
$VITASTOR_CLI create -s 32M testchain
$VITASTOR_FIO -bs=4M -direct=1 -iodepth=1 -fsync=1 -rw=write \
-image=testchain -mirror_file=./testdata/bin/mirror.bin
for i in {1..10}; do
# Create a snapshot
$VITASTOR_CLI snap-create testchain@$i
# Check that the new snapshot is see-through
qemu-img convert -p \
-f raw "vitastor:config_path=$VITASTOR_CFG:image=testchain" \
-O raw ./testdata/bin/check.bin
cmp ./testdata/bin/check.bin ./testdata/bin/mirror.bin
# Write something to it
$VITASTOR_FIO -bs=4k -direct=1 -iodepth=1 -fsync=32 -rw=randwrite \
-randrepeat=$((i <= 2)) -buffer_pattern=0x$((10+i))$((10+i))$((10+i))$((10+i)) \
-image=testchain -number_ios=1024 -mirror_file=./testdata/bin/mirror.bin
# Check the new content
qemu-img convert -p \
-f raw "vitastor:config_path=$VITASTOR_CFG:image=testchain" \
-O raw ./testdata/bin/layer1.bin
cmp ./testdata/bin/layer1.bin ./testdata/bin/mirror.bin
done
$VITASTOR_CLI rm testchain@1 testchain@9
# Check the final image
qemu-img convert -p \
-f raw "vitastor:config_path=$VITASTOR_CFG:image=testchain" \
-O raw ./testdata/bin/layer1.bin
cmp ./testdata/bin/layer1.bin ./testdata/bin/mirror.bin
# Check the last remaining snapshot
qemu-img convert -p \
-f raw "vitastor:config_path=$VITASTOR_CFG:image=testchain@10" \
-O raw ./testdata/bin/layer0.bin
cmp ./testdata/bin/layer0.bin ./testdata/bin/check.bin
format_green OK