20 Disk 18 TB RAID 6 Storage Based on Debian Linux

This is my NAS storage server based on Debian Linux. It uses software RAID and 20 one terrabyte hard drives. It provides a total usable storage capacity of 18 terrabytes in a single RAID 6 array.

One of the remarkable side effects of using 20 drives within a single array is the read performance of over one gigabyte per second.

norco nas

Case:Norco RPC-4020
Processor:Core 2 duo E7400 @ 2.8GHz
RAM:4 GB
Motherboard: Asus P5Q-EM DO
LAN:Intel Gigabit
PSU:Coolermaster 600 Watt Corsair CMPSU-750HX 750 Watt (Coolermaster died)
Controller: HighPoint RocketRAID 2340 (16) and on-board controller (6).
Disks:20 x Samsung Spinpoint F1 (1 TB) and 2 x FUJITSU MHY2060BH (60 GB)
Arrays:Boot: 2x 60 GB RAID 1 and storage: 20 x 1 TB RAID 6
RAID setup:Linux software RAID using MDADM.
RAM:4 GB
Read performance:1.1 GB/s (yes this is correct, not a typo)
Write performance:350 450 MB/s. (suddenly faster after Debian update)
OS:Linux Debian Squeeze 64-bit
Filesystem:XFS (can handle > 16 TB partitions.)
Rebuild time:about 5 hours.
UPS:Back-UPS RS 1200 LCD using Apcupsd
Idle power usage:about  140 Watt

norco nas

setup

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