67 lines
2.2 KiB
Bash
Executable File
67 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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# Example incremental backup script
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set -e
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HOST=your-host.ru
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ERA_DEVICE=md1p3_era
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METADATA_DEVICE=/dev/md1p4
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GRANULARITY=1024
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MOUNTPOINT=/var
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FREEZE_LIMIT=1073741824
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DIR=/media/backup
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FILE=var.bin
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[ -f "$DIR/era" ] || exit 1
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for i in {1..5}; do
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ERA=`cat $DIR/era`
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SIZE=`ssh root@$HOST "dmsetup message $ERA_DEVICE 0 drop_metadata_snap >/dev/null; \
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dmsetup message $ERA_DEVICE 0 take_metadata_snap >/dev/null && \
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(era_invalidate --metadata-snapshot --written-since $ERA $METADATA_DEVICE | era_copy $GRANULARITY | perl -pe 's/\s+.*//')"`
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if [ "$SIZE" -le 0 ]; then
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echo "Failed to estimate delta size"
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exit 1
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fi
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echo "Estimated delta size $((SIZE/1048576)) MB"
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if [ "$SIZE" -le $FREEZE_LIMIT ]; then
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echo "Performing final copy with fsfreeze"
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(ssh root@$HOST "dmsetup message $ERA_DEVICE 0 drop_metadata_snap >/dev/null; \
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trap 'fsfreeze --unfreeze $MOUNTPOINT >/dev/null; exit 1' 1 2 3 15
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fsfreeze --freeze $MOUNTPOINT >/dev/null && \
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dmsetup message $ERA_DEVICE 0 take_metadata_snap >/dev/null && \
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(era_invalidate --metadata-snapshot --written-since $ERA $METADATA_DEVICE | era_copy --progress $GRANULARITY /dev/mapper/$ERA_DEVICE | gzip); \
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fsfreeze --unfreeze $MOUNTPOINT >/dev/null" | \
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gzip -d | era_apply $DIR/$FILE) && \
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(ssh root@$HOST "dmsetup status $ERA_DEVICE | perl -e 'print [split /\s+/, <>]->[5]'" > $DIR/era_new) || exit 1
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mv $DIR/era_new $DIR/era
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echo "Copied up to era "`cat $DIR/era`
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exit 0
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else
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echo "Performing intermediate copy without fsfreeze"
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(ssh root@$HOST "dmsetup message $ERA_DEVICE 0 drop_metadata_snap >/dev/null; \
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dmsetup message $ERA_DEVICE 0 take_metadata_snap >/dev/null && \
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(era_invalidate --metadata-snapshot --written-since $ERA $METADATA_DEVICE | era_copy --progress $GRANULARITY /dev/mapper/$ERA_DEVICE | gzip)" | \
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gzip -d | era_apply $DIR/$FILE) && \
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(ssh root@$HOST "dmsetup status $ERA_DEVICE | perl -e 'print [split /\s+/, <>]->[5]'" > $DIR/era_new) || exit 1
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mv $DIR/era_new $DIR/era
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fi
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done
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echo "Failed to perform final copy"
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exit 1
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