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Sun StorEdge 3000 Family Installation, Operation, and Service Manual • March 2004
For a 5-drive array, the RAID array is preconfigured as follows:
■
One RAID 5 logical drive, consisting of four physical drives
■
One global spare
The following table highlights the RAID levels available.
Note –
Logical volumes are unsuited to some modern configurations, such as Sun
Cluster environments, and do not work in those configurations. Use logical drives
instead. For more information see
“Configuration Overview” on page 5-7
.
For more information about logical drives, spares, and RAID levels, refer to the
Sun
StorEdge 3000 Family RAID Firmware User’s Guide
for your array.
TABLE 5-7
RAID Level Definitions
RAID Level
Description
RAID 0
Striping without data redundancy; provides maximum performance.
RAID 1
Mirrored or duplexed disks; for each disk in the system, a duplicate disk is
maintained for data redundancy. It requires 50% of total disk capacity for
overhead.
RAID 3
Striping with dedicated parity. Parity is dedicated to one drive. Data is
divided into blocks and striped across the remaining drives.
RAID 5
Striping with distributed parity; this is the best-suited RAID level for
multitasking or transaction processing.The data and parity are striped across
each drive in the logical drive, so that each drive contains a combination of
data and parity blocks.
NRAID
NRAID is an older configuration that is rarely used and is not recommended.
RAID 1+0
RAID 1+0 combines RAID 1 and RAID 0—mirroring and disk striping. RAID
1+0 allows multiple drive failures because of the full redundancy of the hard
disk drives. If four or more hard disk drives are chosen for a RAID 1 logical
drive, RAID 1+0 is performed automatically.
RAID (3+0)
A logical volume with several RAID 3 member logical drives.
RAID (5+0)
A logical volume with several RAID 5 member logical drives.
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