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Greenplum MapR Hadoop:Disk setup

Question asked by li_wei on Feb 16, 2012
Latest reply on Feb 16, 2012 by nabeel
I found this description about disk setup  in install guide:

It is not necessary to set up RAID on disks used by MapR-FS. MapR uses a script called disksetup to set up storage pools. In most cases, you should let MapR calculate storage pools using the default stripe width of two or three disks. If you anticipate a high volume of random-access I/O, you can use the -W option with disksetup to specify larger storage pools of up to 8 disks each.

question is :
1)for disk, pls define default stripe width of two or three disks. Is it RAID 0?
2)Why use –W and why unto 8 disk, pls explain in detail?