Best Hard Drive 2014

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

• Raid 5 - 3 Drives → 4TB → 22.5W
• Raid 5 - 4 Drives → 6TB → 30W

1. are iSCSI targets connected on bootup (Windows):

   **yes**

2. are iSCSI targets connected on bootup (Ubuntu): yes, is seems initiator is able to reconnect even after a target restart
3. Does iSCSI reattach quickly after suspend: Linux yes with some work, Windows: yes
4. can you grow iSCSI targets as normal files
5. can you grow iSCSI targets as ZFS volumes: yes, (zfs set volsize=2g <POOL>/<DATASET>)
6. Is there a write gain for 4 drive raid 5: yes
7. 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
8. what is the added latency of ethernet/tcp transmissions: 0.1ms - 0.2ms

• NFS locking must be turned on otherwise NFS exports will not work as home directories

...
rpcbind_enable="YES"
nfs_server_enable="YES"
mountd_flags="-r"
rpc_lockd_enable="YES"
rpc_statd_enable="YES"
...

zfs set sync=disabled <DATASET>

zfs set sharenfs="-maproot=root,-alldirs" <DATASET>

apt-get install autofs

...
BROWSE_MODE="yes"
LOGGING="debug"
MOUNT_NFS_DEFAULT_PROTOCOL=3
...

• Autofs sends logging to syslog, on 14.10 logging showed up in /var/log/syslog

/netHomes /etc/auto.home --timeout=300

• There must be a leading “/” between the NFS server and the export e.g. 192.168.0.1:/export

<SERVERNAME> -rw,soft,timeo=5,intr <IP/HOSTNAME>:/<DATASET>

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