Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Hardware User's Manual page 39

Stripesets (RAID 0) combine disk drives in serial to increase transfer or
requests rates
Mirrorsets (RAID 1) combine disk drives in parallel to provide a highly
reliable storage unit
RAID 4 provides striping with a fixed parity drive
RAIDsets (RAID 5) combine disk drives in serial— just like stripesets
— but also store parity data to ensure high reliability
Stripe mirrorsets (RAID 0 + 1) combine mirrorsets in serial to provide
the highest throughput and availability of any storage unit
Table 2–1 lists the features of the RAID 3000 controller.
Item
Environmental monitoring
Processor
System bus interface
Configuration
RAID levels supported
Drive channels supported
Number of logical drives (LUN's)
SCSI channels
Metadata
Largest allowable disk/RAID set/LUN
Non-RAID device support
Drives supported
Drive reconstruct
Disk hot plug
Disk hot spare (spinning)
Table 2-1
Controller Specifications
High availability fault bus support via EMU
40 MHz, 32 bit LR33310 RISC CPU
Two, Wide, differential UltraSCSI channels
Two RS232 serial ports
0, 1, 0+1, 4, 5
Two, Wide, UltraSCSI single-ended channels
Up to 30 RAID sets, and up to 16 redundancy
groups (LUNs) per RAID set
Two, UltraSCSI, 16-bit, single-ended
20 blocks/disk (10240 bytes)
Two, 32 blocks (approximately 2.2 petabytes)
Disk drives (JBOD)
StorageWorks 2, 4, 18, and 36 GB SCSI and
UltraSCSI drives.
Automatic with hot or warm spares
Yes
Yes, global hot spare
RAID Array Controller 2-5
Specifications
continued