add zfs notes

zfs/sync-chain.md

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+# Snapshot and run bitcoin-qt from a cloned filesystem
+
+```
+# create snapshot of /mnt/hdd - fourdiskpool/hdd@hdd-snapshot
+zfs snap fourdiskpool/hdd@hdd-snapshot
+# display snapshots
+zfs list -t snap
+# clone snapshot (fourdiskpool/hdd/hdd-snapshot-clone)
+sudo zfs clone fourdiskpool/hdd@hdd-snapshot fourdiskpool/hdd/hdd-snapshot-clone
+# see if mounted
+zfs list
+
+# delete lockfile
+sudo rm /mnt/hdd/hdd-snapshot-clone/bitcoin/.lock
+# delete bitcoin.conf
+sudo rm /mnt/hdd/hdd-snapshot-clone/bitcoin/bitcoin.conf
+
+# sync (not reliable while the source bitcoind is running)
+sudo -u bitcoin rsync -v -r /mnt/hdd/bitcoin/blocks/ /mnt/hdd/hdd-snapshot-clone/bitcoin/blocks/
+sudo -u bitcoin rsync -v -r /mnt/hdd/bitcoin/chainstate/ /mnt/hdd/hdd-snapshot-clone/bitcoin/chainstate/
+
+
+# start the destination node
+sudo -u bitcoin bitcoind --listen=0 --datadir=/mnt/hdd/hdd-snapshot-clone/bitcoin
+
+# to use the bitcoin-qt GUI use the password_B to log in with the bitcoin user (might need to permit it in the ssh settings)
+ssh -X bitcoin@raspiblitz_ip
+
+bitcoin-qt --listen=0 --datadir=/mnt/hdd/hdd-snapshot-clone/bitcoin
+```
+
+```
+# OFF
+# destroy the clone filesystem
+sudo zfs destroy fourdiskpool/hdd/hdd-snapshot-clone
+# destroy the snapshot
+sudo zfs destroy fourdiskpool/hdd@hdd-snapshot
+```