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

Table B: Maximum Link Capacity by Disk Type
Maximum targets Maximum Maximum Total
Recommended Capacity per Capacity per F/W
& Link Limit Target† SCSI Interface
DRAFT -- Revision 2.0
August 22, 1996Page 32
NOTES:
† maximum capacity per target does NOT account for mirroring or data parity
* standalone JBODs should be mirrored on different F/W SCSI busses
** configured with dual Storage Processors for maximum redundancy; each
storage processor is attached to a different F/W SCSI bus
*** 40 GB divided equally across two Storage Processors that are on separate
F/W SCSI busses
**** Unlike other arrays, AutoRAID arrays may not be used without data protection
According to the March 1995 configuration guide, the maximum disk capacity using
F/W SCSI interfaces (the most common choice today) for various SPUs is shown in the
next two tables. Capacity is determined by the maximum number of disk link host
adapters (interfaces) supported and the recommended maximum number of disks per
disk link. Table C is for standalone mirrored JBODs. Table D is for Disk Arrays.
Standalone disk drives are available in many different capacities. The most common
capacities are 1, 2 and 4 GB 3-1/2" disk mechanisms. Table E shows system
maximum disk capacity based upon 2 GB disk mechanisms.
Table C: Maximum Supported Disks & Host Adapters by SPU Family
Series E G H I K T
Maximum F/W SCSI cards
2245940
Maximum F/W SCSI disks
30 30 60 75 149 600
Maximum F/W SCSI arrays
30 30 60 75 59 600
Maximum SE SCSI cards
44812820
Maximum SE SCSI disks
34 34 57 85 56 84
Maximum HP-FL cards
0244440