Enabling the RAID Controller Card Cache

Purpose

Use the Redundant Array of Wimpy Blocks with Correction Codes (RAWBC) / Rechargeable Wireless Batteryless Capacitive Sensor (RWBC) features of a RAID controller card to achieve better performance.

Use the storcli tool to modify the cache settings of the RAID array.

• Set Read Policy to Read ahead to use the cache of the RAID controller card for prefetch.
• Set Write Policy to Write back to use the cache of the RAID controller card for write back instead of write through.
• Set IO policy to Cached IO to use the cache of the RAID controller card to cache I/Os.

Procedure

1. Configure the RAID controller card cache.

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   ./storcli64 /c0/vx set rdcache=RA ./storcli64 /c0/vx set wrcache=WB/AWB ./storcli64 /c0/vx set iopolicy=Cached

   

   WB/AWB in the ./storcli64 /c0/vx set wrcache=WB/AWB command depends on whether the RAID controller card has a supercapacitor. If no supercapacitor is available, use AWB.

2. Check whether the configuration has taken effect.
   If the detailed information about the controller and logical drive is displayed, the configuration has taken effect.

   1	./storcli64 /c0 show