Raid 0: Disk Striping Or Intergated Stripe (Is); Raid 1: Disk Mirroring Or Integrated Mirror (Im) - Sun Microsystems Sun Fire V445 Server Administration Manual

RAID 0: Disk Striping or Intergated Stripe (IS)

Disk striping, Integrated Stripe (IS), or RAID 0 is a technique for increasing system
throughput by using several disk drives in parallel. In nonstriped disks the OS
writes a single block to a single disk. In a striped arrangement, each block is divided
and portions of the data are written to different disks simultaneously.
System performance using RAID 0 will be better than using RAID 1, but the
possibility of data loss is greater because there is no way to retrieve or reconstruct
data stored on a failed disk drive.

RAID 1: Disk Mirroring or Integrated Mirror (IM)

Disk mirroring, Integrated Mirror (IM), or RAID 1 is a technique that uses data
redundancy – two complete copies of all data stored on two separate disks – to
protect against loss of data due to disk failure. One logical volume is duplicated on
two separate disks.
Whenever the OS needs to write to a mirrored volume, both disks are updated. The
disks are maintained at all times with exactly the same information. When the OS
needs to read from the mirrored volume, it reads from whichever disk is more
readily accessible at the moment, which can result in enhanced performance for read
operations.
Chapter 6 Managing Disk Volumes 121