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

Table N: Disk Selection Matrix by Product
Availability Requirement A B C D E F G
DRAFT -- Revision 2.0
August 22, 1996Page 53
redundant cooling Yes Yes Yes Yes Yes ??? Yes
*7
hot-replaceable cooling N/A Yes No No Yes ??? Yes
redundant controller Yes Yes No No Yes ??? Yes
*7 *7
hot-replaceable controller N/A N/A No No Yes ??? Yes
redundant link cable Yes Yes Yes Yes Yes Yes Yes
*7 *7 *8 *9 *10 *9
redundant SPU interface Yes Yes Yes Yes Yes Yes Yes
*7 *7 *8 *9 *10 *9
concurrent offline backup Yes Yes No No No No No
performance H H L M/L M/L VH M
cable length 25 25 500 25 25 25 25
mmmmmmm
automatic disk backup in case No No No No No Yes No
of power failure