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Getting the RAID controller e200i to work

First we need to add the HP repositories This are the Debian Jessie repositories from HP which contain the utilities to manage the raid controller e200i. Paste this into /etc/apt/sourcelist 

deb http://downloads.linux.hpe.com/SDR/repo/mcp jessie/current non-free

Then do a 

sudo apt update

And install the necessary packages. On my LM110 G5 only this two worked: 

sudo apt install hpssacli hpssaducli

After we installed the packages we can now get some health data from our raid controller and the disks.

First run: 

sudo hpssacli

To enter the RAID Administration Utility. With the following command we can detailed information of all the attached RAID controllers: 

ctrl all show config

Which outputs on my machine: 

Smart Array E200 in Slot 3                (sn: PA6C90P9SWJ0CE)
    array A (SATA, Unused Space: 0  MB)
        logicaldrive 1 (1.4 TB, RAID 5, OK)
        physicaldrive 1I:0:1 (port 1I:box 0:bay 1, SATA, 500 GB, OK)
        physicaldrive 1I:0:2 (port 1I:box 0:bay 2, SATA, 500 GB, OK)
        physicaldrive 1I:0:3 (port 1I:box 0:bay 3, SATA, 500 GB, OK)
        physicaldrive 1I:0:4 (port 1I:box 0:bay 4, SATA, 500 GB, OK)

With: 

ctrl show all detail

We get the following output 

Smart Array E200 in Slot 3
    Bus Interface: PCI
    Slot: 3
    Serial Number: PA6C90P9SWJ0CE
    Cache Serial Number: P9A3A0B9SWJ5XF
    RAID 6 (ADG) Status: Disabled
    Controller Status: OK
    Hardware Revision: A
    Firmware Version: 1.84
    Rebuild Priority: Medium
    Expand Priority: Medium
    Surface Scan Delay: 15 secs
    Surface Scan Mode: Idle
    Parallel Surface Scan Supported: No
    Post Prompt Timeout: 0 secs
    Cache Board Present: True
    Cache Status: OK
    Cache Ratio: 100% Read / 0% Write
    Drive Write Cache: Enabled
    Total Cache Size: 128 MB
    Total Cache Memory Available: 96 MB
    No-Battery Write Cache: Disabled
    Cache Backup Power Source: Batteries
    Battery/Capacitor Count: 1
    Battery/Capacitor Status: OK
    SATA NCQ Supported: False
    Number of Ports: 2 Internal only
    Driver Name: cciss
    Driver Version: 3.6.26
    Driver Supports HP SSD Smart Path: False
    PCI Address (Domain:Bus:Device.Function): 0000:0A:08.0

To improve disk performance I will enable the disk write cache and set the cache ratio to 100/0 

=> ctrl slot=0 modify cacheratio=100/0
=> ctrl slot=0 modify dwc=enable

Now we have everything configured for the RAID on our server.

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