6-14 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • May 2004
6.1.8 Reviewing Default Logical Drives and RAID
Levels
A logical drive is a set of physical drives grouped together to operate under a
particular RAID level. Each RAID array is capable of supporting as many as eight
logical drives.
A physical drive can be assigned as the local spare drive to one specified logical
drive, or as a global spare drive that is available to all logical drives in the RAID
array.
Spare drives can be part of an automatic logical drive rebuild.
Note – A spare drive is not available for logical drives with no data redundancy
(NRAID and RAID 0).
The logical drives in an array can have the same or different RAID levels.
■ A logical drive can be further divided into a maximum of 128 partitions.
■ In loop mode, the maximum number of partitions is 1024 partitions per RAID
array. To create a maximum of 1024 partitions, see “Planning for 1024 LUNs
(Optional, Loop Mode Only)” on page 6-37.
■ In point-to-point mode, the maximum number of partitions is 64 partitions in a
redundant configuration.
TABLE 6-4 Maximum Number of Disks per Sun StorEdge 3511 FC Array Logical Drive
Disk Capaci-
ty (GB)
RAID 5
Random
RAID 5 Se-
quential
RAID 3
Random
RAID 3 Se-
quential
RAID 1
Random
RAID 1 Se-
quential
RAID 0
Random
RAID 0 Se-
quential
250.0 3 8 3 8 4 8 2 8
TABLE 6-5 Maximum Usable Capacity (Gbyte) per Sun StorEdge 3511 FC Array Logical Drive
Disk Capacity RAID 5
Random
RAID 5 Se-
quential
RAID 3
Random
RAID 3 Se-
quential
RAID 1
Random
RAID 1 Se-
quential
RAID 0
Random
RAID 0 Se-
quential
250.0 500 1908 500 1908 500 2000 500 2000
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