{{tag>[Hardware HP p222]}}
=====HP P222 configuration=====

====Show RAID config====
Add 'detail' to the command below for more detail.
<code># hpssacli controller slot=1 show config

Smart Array P222 in Slot 1                (sn: PDSXH0BRH6E0ZP)

   array A (SAS, Unused Space: 0  MB)


      logicaldrive 1 (558.7 GB, RAID 1+0, OK)

      physicaldrive 2I:1:1 (port 2I:box 1:bay 1, SAS, 300 GB, OK)
      physicaldrive 2I:1:2 (port 2I:box 1:bay 2, SAS, 300 GB, OK)
      physicaldrive 2I:1:3 (port 2I:box 1:bay 3, SAS, 300 GB, OK)
      physicaldrive 2I:1:4 (port 2I:box 1:bay 4, SAS, 300 GB, OK)

   SEP (Vendor ID PMCSIERA, Model SRCv8x6G) 380 (WWID: 50014380305FB0DF)</code>
   
====Show status====
<code># hpssacli controller slot=1 show status

Smart Array P222 in Slot 1
   Controller Status: OK
   Cache Status: OK
   Battery/Capacitor Status: OK</code>
====Enable drive write cache====
//CAUTION: Because physical drive write cache is not battery-backed, you could lose data if a power failure occurs during a write process. To minimize this possibility, use a backup power supply"//

  * First get current cache status: <code># hpssacli controller slot=1 show config detail |grep -i cache
   Cache Serial Number: PBKUA0BRH6E54G
   Wait for Cache Room: Disabled
   Cache Board Present: True
   Cache Status: OK
   Cache Ratio: 25% Read / 75% Write
   Drive Write Cache: Disabled
   Total Cache Size: 512 MB
   Total Cache Memory Available: 304 MB
   No-Battery Write Cache: Disabled
   Cache Backup Power Source: Capacitors
   Cache Module Temperature (C): 35</code>
  * Enable drive write cache: <code># hpssacli controller slot=1 modify dwc=enable

Warning: Without the proper safety precautions, use of write cache on physical 
         drives could cause data loss in the event of power failure.  To ensure
         data is properly protected, use redundant power supplies and
         Uninterruptible Power Supplies. Also, if you have multiple storage
         enclosures, all data should be mirrored across them. Use of this
         feature is not recommended unless these precautions are followed.
         Continue? (y/n) </code>