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RAID Array Controller 2-5
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide Comments:
Part Number: EK-SMCPO-UG. C01 File Name: c-ch2 RAID Array Controller.doc Last Saved On: 12/4/00 1:51 PM
■
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.
Table 2-1
Controller Specifications
Item Specifications
Environmental monitoring High availability fault bus support via EMU
Processor 40 MHz, 32 bit LR33310 RISC CPU
System bus interface Two, Wide, differential UltraSCSI channels
Configuration Two RS232 serial ports
RAID levels supported 0, 1, 0+1, 4, 5
Drive channels supported Two, Wide, UltraSCSI single-ended channels
Number of logical drives (LUN’s)
Up to 30 RAID sets, and up to 16 redundancy
groups (LUNs) per RAID set
SCSI channels Two, UltraSCSI, 16-bit, single-ended
Metadata 20 blocks/disk (10240 bytes)
Largest allowable disk/RAID set/LUN Two, 32 blocks (approximately 2.2 petabytes)
Non-RAID device support Disk drives (JBOD)
Drives supported
StorageWorks 2, 4, 18, and 36 GB SCSI and
UltraSCSI drives.
Drive reconstruct Automatic with hot or warm spares
Disk hot plug Yes
Disk hot spare (spinning) Yes, global hot spare
continued