Choosing the Right Disk Technology in a High Availability Environment DRAFT Version 2.0, August 1996

DRAFT -- Revision 2.0
August 22, 1996Page 52
C - HP-FL RAID disk arrays (FLDA)
D - F/W SCSI RAID disk arrays (SCSI DA)
E - High Availability disk arrays (HADA)
F - Solid state disks
G - High Availability Disk Array with AutoRAID
NOTES: RAID levels are given as Rn, where n is the RAID level.
Notes are referenced as *n, where n is the note number.
Relative rankings are referenced at VH, H, M and L for very high high,
medium and low.
Table N: Disk Selection Matrix by Product
Availability Requirement A B C D E F G
On-line mechanism Yes Yes Yes Yes Yes No Yes
replacement *1 *2 R3 R3 R5
R5 R1
R01
Quiescent mechanism Yes Yes Yes Yes Yes No N/A
replacement *3 *4 R0 R0 R0
Global hot spare capability Yes Yes No No Yes No Yes
*5 *5
One-level data redundancy Yes Yes Yes Yes Yes Yes Yes
R3 R3 R1
R5 R01
R5
Two-level data redundancy Yes Yes Yes Yes Yes No Yes
*6 *6 *6 *6
Cost H H H M M/L VH M
Footprint HHHHMVHM
redundant disk mechanism Yes Yes Yes Yes Yes Yes Yes
redundant power supply Yes Yes No No Yes Yes Yes
*7 *7
redundant power source Yes Yes No No No No Yes
*7 *7