Add ariane doc

doc/ariane.md

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+# ariane
+## Hard disks
+|     | V1  | V2  | V3  | V4  |
+| :-: | :-: | :-: | :-: | :-: |
+|**H1**|00 /dev/sda `6TB` <br> `WD-WX21D36PP32E`|04  |08  |12  |
+|**H2**|01 /dev/sdb `6TB` <br> `WD-WX21D36PPLPH`|05  |09  |13  |
+|**H3**|02 /dev/sdc `6TB` <br> `WD-WX21D36PP0K1`|06  |10  |14  |
+|**H4**|03 /dev/sdd `6TB` <br> `WD-WXB1HB4MJCMM`|07  |11  |15  |
+## Install ZFS
+```shell
+apt-get install zfsutils-linux
+modprobe zfs
+systemctl restart zfs-import-cache
+systemctl restart zfs-import-scan
+systemctl restart zfs-mount
+systemctl restart zfs-share
+```
+## Initial ZFS Setup
+### Find disk serial numbers
+```shell
+for i in a b c d e f g; do echo -n "/dev/sd$i: "; hdparm -I /dev/sd$i | awk '/Serial Number/ {print $3}'; done
+```
+### Wipe disks
+```shell
+mdadm --zero-superblock --force /dev/sda
+sgdisk --zap-all /dev/sdX
+```
+### Partition disks
+```shell
+sgdisk -n1:0:0 -t1:BF01 /dev/sdX
+```
+### Create zpool
+```shell
+zpool create -o ashift=12 -O atime=off -O compression=lz4 \
+zv1 raidz2 \
+/dev/disk/by-id/ata-WDC_WD60EFRX-68L0BN1_WD-WX21D36PP32E-part1 \
+/dev/disk/by-id/ata-WDC_WD60EFRX-68L0BN1_WD-WX21D36PPLPH-part1 \
+/dev/disk/by-id/ata-WDC_WD60EFRX-68L0BN1_WD-WX21D36PP0K1-part1 \
+/dev/disk/by-id/ata-WDC_WD60EFRX-68L0BN1_WD-WXB1HB4MJCMM-part1
+```
+### Create datasets
+```shell
+zfs create zv1/homes
+zfs create zv1/daten
+zfs create zv1/fotos
+```
+### Set dataset quota
+```shell
+zfs set quota=1T zv1/daten zv1/fotos zv1/homes
+```
+### Transfer data
+```shell
+rsync --stats -avhP --exclude Pictures root@atlas:/mnt/save/fet_daten/ /zv1/daten/
+rsync --stats -avhP root@atlas:/mnt/save/fet_daten/Pictures/ /zv1/fotos/
+rsync --stats -avhP root@atlas:/home/ /zv1/homes/
+```
+### Before reinstalling
+```shell
+zfs export
+```
+### After reinstalling
+```shell
+zfs import
+```
+### Add 2GB log partition on ssd
+```shell
+zpool add zv1 log mirror /dev/nvme0n1p2 /dev/nvme1n1p2
+```
+### If intend using ACL (not done!)
+```shell
+zfs set xattr=sa <dataset>
+zfs set acltype=posixacl <dataset>
+```
+## ZFS Maintenance
+```shell
+zpool status -v
+zpool list -v
+zpool get all
+zpool history
+zpool scrub zv1
+```
+## MDADM Maintenance
+```shell
+mdadm --misc --detail /dev/md0
+echo check > /sys/block/md0/md/sync_action
+watch -n 0.1 cat /proc/mdstat
+```