Chapter 8
Post-Installation Global Parameters Configurations
123
Using RAID Levels to Configure
Redundancy
The RAID level determines how the controller reads and writes data and parity on
the drives. The Sun StorEdge T3+ array can be configured with RAID level 0, RAID
level 1 (1+0), or RAID level 5. The factory-configured LUN is a RAID 5 LUN.
Note –
The default RAID level (5) can result in very large volumes—for example,
128 Gbytes in a configuration of a single 7+1 RAID 5 LUN plus a hot spare, with
18-Gbyte drives. Some applications cannot use such large volumes effectively. The
following three solutions can be used separately or in combination:
■
Use the partitioning utility available on the data host’s operating system. In the
Solaris environment, use the
format
utility, which can create up to seven distinct
partitions per volume. Note that in the case of the configuration described above,
if each partition is equal in size, this will result in 18-Gbyte partitions, which still
may be too large to be used efficiently by legacy applications.
■
Use third-party software on the host system to create as many partitions as
desired from a given volume. In the Solaris environment, you can use VERITAS
Volume Manager or Solaris Logical Volume Management (SLVM)—formerly
known as Solstice DiskSuite (SDS)—for this purpose.
■
Use volume slicing.
Note –
For information on using the
format
utility, refer to the
format
(1M) man
page. For more information on third-party software or VERITAS Volume Manager,
refer to the documentation for that product.
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