====== Home ZFS NAS Project ======

===== Background =====

[[https://www.backblaze.com/blog/best-hard-drive/|Best Hard Drive 2014]]

===== Hard Drive Choice =====

  * HGST Deskstar 7K2000 HDS722020ALA330 (Ebay $50)(Amazon $70) (Newegg $140) (Power Idle 7.5W)

===== Raid Levels =====

  * Raid 5 - 3 Drives -> 4TB -> 22.5W
  * Raid 5 - 4 Drives -> 6TB -> 30W

===== Questions =====
  - are iSCSI targets connected on bootup (Windows): <file>**yes**</file>
  - are iSCSI targets connected on bootup (Ubuntu): **yes, is seems initiator is able to reconnect even after a target restart**
  - Does iSCSI reattach quickly after suspend: **Linux yes with some [[ubuntu:iscsihomedir|work]], Windows: yes**
  - can you grow iSCSI targets as normal files
  - can you grow iSCSI targets as ZFS volumes: **yes, (zfs set volsize=2g <POOL>/<DATASET>)**
  - Is there a write gain for 4 drive raid 5: **yes**
  - What is the performance hit for parity calculations: **very small, active cpu usage is less than 2%, local throughput at 4 drives is 200MB/s, iSCSI access is at 125MB/s or 1000mb/s**
  - what is the added latency of ethernet/tcp transmissions: **0.1ms - 0.2ms**


====== NFS Automounter Homes ======

===== On Server =====

==== /etc/rc.conf ====
  * NFS locking must be turned on otherwise NFS exports will not work as home directories
<file>
...
rpcbind_enable="YES"
nfs_server_enable="YES"
mountd_flags="-r"
rpc_lockd_enable="YES"
rpc_statd_enable="YES"
...
</file>

==== Disable ZLI on nfs dataset ====
<file>
zfs set sync=disabled <DATASET>
</file>
==== Share Dataset ====
<file>
zfs set sharenfs="-maproot=root,-alldirs" <DATASET>
</file>

===== On Client =====
===== Install autofs =====
<file>
apt-get install autofs
</file>


==== /etc/default/autofs ====
<file>
...
BROWSE_MODE="yes"
LOGGING="debug"
MOUNT_NFS_DEFAULT_PROTOCOL=3
...
</file>
  * Autofs sends logging to syslog, on 14.10 logging showed up in **/var/log/syslog**

==== /etc/auto.master ====
<file>
/netHomes /etc/auto.home --timeout=300
</file>

==== /etc/auto.homes ====
  * There must be a leading "/" between the NFS server and the export e.g. 192.168.0.1:/export
<file>
<SERVERNAME> -rw,soft,timeo=5,intr <IP/HOSTNAME>:/<DATASET>
</file>

  * This will mount **<IP/HOSTNAME>:/<DATASET>** on **/netHomes/<SERVERNAME>**