Segment server RAID configurations
Each segment server in DCA has 12 disks that have two RAID groups of RAID 5
(5+1) attached. DCA maximizes the I/O performance by using the following RAID
• Disabled disk cache policy
• Write policy for write back
• Read policy for adaptive read ahead
The segment instances are equally spread across two file systems: /data1 and
/data2. The table below details the RAID configurations for the segment servers.