Chapter 6 Managing Disk Volumes 65
Integrated Stripe Volumes (RAID 0)
Integrated Stripe volumes are configured by initializing the volume across two or
more physical disks, and sharing the data written to the volume across each physical
disk in turn, or striping the data across the disks.
Integrated stripe volumes provide for a logical unit (LUN) that is equal in capacity
to the sum of all its member disks. For example, a three-disk IS volume configured
on 72 GByte drives will have a 216 GByte capacity.
FIGURE 6-1 Graphical Representation of Disk Striping
Caution – There is no data redundancy in an IS volume configuration. Thus, if a
single disk fails, the entire volume fails, and all data is lost. If an IS volume is
manually deleted, all data on the volume is lost.
IS volumes are likely to provide better performance than IM volumes or single disks.
Under certain workloads, particularly some write or mixed read-write workloads,
I/O operations complete faster because each sequential block is written to each
member disk in turn.
Integrated Mirror Volumes (RAID 1)
Disk mirroring (RAID 1) is a technique that uses data redundancy, where two
complete copies of all data are stored on two separate disks to protect against loss of
data due to disk failure. One logical volume is duplicated on two separate disks.
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