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create a ZFS pool to be used as a Raspiblitz disk
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zfs/create-raspiblitz-zfs-disk.md
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146
zfs/create-raspiblitz-zfs-disk.md
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# Create a ZFS pool to be used as a Raspiblitz disk
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## Documentation
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* https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/Debian%20Bullseye%20Root%20on%20ZFS.html
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* https://github.com/rootzoll/raspiblitz/issues/3590
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```
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man zpool create
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man zpool-features
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man zfsprops
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man zfs-load-key
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```
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# Install ZFS and create a pool
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```
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# work as root
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sudo su -
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apt install zfsutils-linux
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# create encryption key
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dd if=/dev/urandom of=/root/.zpoolraw.key bs=32 count=1
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chmod 400 /root/.zpoolraw.key
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# list physical disks
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lsblk --scsi
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# get the IDS
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ls -la /dev/disk/by-id
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# Working with a four disk setup - need identical sizes in the mirrrors
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DISK1="/dev/disk/by-id/ata-name-and-id-of-disk1"
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DISK2="/dev/disk/by-id/ata-name-and-id-of-disk2"
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DISK3="/dev/disk/by-id/ata-name-and-id-of-disk3"
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DISK4="/dev/disk/by-id/ata-name-and-id-of-disk4"
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# Clear the partition table:
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sgdisk --zap-all $DISK1
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sgdisk --zap-all $DISK2
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sgdisk --zap-all $DISK1
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sgdisk --zap-all $DISK2
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# create pool with two disk pair mirrored, see the last line and edit to your setup:
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# mirror $DISK1 $DISK3 mirror $DISK2 $DISK4
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zpool create \
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-o cachefile=/etc/zfs/zpool.cache \
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-o ashift=12 -d \
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-o feature@async_destroy=enabled \
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-o feature@bookmarks=enabled \
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-o feature@bookmark_v2=enabled \
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-o feature@embedded_data=enabled \
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-o feature@empty_bpobj=enabled \
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-o feature@enabled_txg=enabled \
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-o feature@encryption=enabled \
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-o feature@extensible_dataset=enabled \
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-o feature@filesystem_limits=enabled \
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-o feature@hole_birth=enabled \
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-o feature@large_blocks=enabled \
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-o feature@livelist=enabled \
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-o feature@lz4_compress=enabled \
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-o feature@spacemap_histogram=enabled \
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-o feature@zpool_checkpoint=enabled \
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-O acltype=posixacl -O canmount=off -O compression=lz4 \
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-O devices=off -O normalization=formD -O relatime=on -O xattr=sa \
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-O mountpoint=/mnt \
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-O encryption=on \
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-O keyformat=raw -O keylocation=file:///root/.zpoolraw.key \
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mirrorpool mirror $DISK1 $DISK3 # mirror $DISK2 $DISK4
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# check
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zpool status
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zpool list
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# create a dataset name hdd (so it can be mounted as /mnt/hdd)
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zfs create zpool/hdd
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# check
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zfs list
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df -h
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# Mount a ZFS dataset to `/mnt/hdd`:
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zfs create zpool/hdd
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zfs mount zpool/hdd /mnt
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#or change an existing mountpoint for a whole pool:
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sudo zfs set mountpoint=/mnt/hdd POOL1
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# to automount:
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echo "\
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[Service]
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ExecStartPre=/sbin/zfs load-key -a
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ExecStartPre=/sbin/zfs mount -la
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" | sudo tee /etc/systemd/system/bootstrap.service.d/zfsautomount.conf
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# or in cron:
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cronjob="@reboot sudo /sbin/zfs load-key -a; sudo /sbin/zfs mount -la"
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(
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crontab -u admin -l
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echo "$cronjob"
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) | crontab -u admin -
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```
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## ZFS encryption key operations
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```
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# backup the key
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xxd /root/.zpoolraw.key
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00000000: 30cc f221 94e1 7f01 cd54 d68c a1ba f124 0..!.....T.....$
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00000010: e1f3 1d45 d904 823c 77b7 1e18 fd93 1676 ...E... <w......v
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# recover the key from text
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# https://lightning.readthedocs.io/BACKUP.html#hsm-secret
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cat >.zpoolraw_hex.txt <<HEX
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00: 30cc f221 94e1 7f01 cd54 d68c a1ba f124
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10: e1f3 1d45 d904 823c 77b7 1e18 fd93 1676
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HEX
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xxd -r .zpoolraw_hex.txt >/root/.zpoolraw.key
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chmod 0400 .zpoolraw.key
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srm .zpoolraw_hex.txt
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```
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## temperature monitoring
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```
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sudo sudo apt install hddtemp nvme-cli
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sudo hddtemp /dev/sd?
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sudo nvme smart-log /dev/nvme0 | grep "^temperature"
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sudo nvme smart-log /dev/nvme1 | grep "^temperature"
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sudo smartctl -d auto -H /dev/nvme0
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sudo smartctl -d auto -H /dev/nvme1
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sudo smartctl -d auto -a /dev/nvme1
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sudo smartctl -d auto -a /dev/nvme1
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```
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## import an existing ZFS pool
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* https://openzfs.github.io/openzfs-docs/Getting%20Started/Debian/index.html
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```
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zpool import
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zpool import -a
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sudo /sbin/zfs load-key -a
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sudo /sbin/zfs mount -la
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cronjob="@reboot sudo /sbin/zfs load-key -a; sudo /sbin/zfs mount -la"
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(
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crontab -u admin -l
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echo "$cronjob"
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) | crontab -u admin -
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```
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