How to configure the HP SMART ARRAY P420 RAID controller

How to check the status of the RAID

1. Log into your server using SSH.

2. Run the following command to display the status of the RAID:

   ssacli ctrl all show config
   Copy code

   An output as the following example displays:

   Smart Array P420 in Slot 1                (sn: PACCRID1XXXXXX)
   
   array A (SATA, Unused Space: 0 MB)
   
       logicaldrive 1 (1.8 TB, RAID 1, OK)
   
       physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SATA, 2 TB, OK)
       physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SATA, 2 TB, OK)
   Copy code

3. Run the following commands to display the SMART values of the disks:

   smartctl -a -d cciss,0 /dev/sg0
   Copy code

   Then run:

   smartctl -a -d cciss,1 /dev/sg0
   Copy code

How to check the battery state of a P420 RAID controller with cache and battery

Run the following command to check the battery state of an HP SMART ARRAY P420 RAID controller:

```
ssacli ctrl all show config detail
```

It resets the cache and battery of the controller:

```
Total Cache Size: 256 MB
Cache Backup Power Source: Batteries
Battery/Capacitor Count: 1
Battery/Capacitor Status: OK
```
Copy code