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

Primary Links
Redundant
Links
DRAFT -- Revision 2.0
August 22, 1996Page 29
Figure 7: Typical High Availability Configuration using the EMC Symmetrix ICDA
and PVLinks
Advantages and Disadvantages of Symmetrix ICDAs
+ smaller overall footprint for a given amount of storage
+ availability of 9 GB disk mechanisms
+ most cost effective solution for very large configurations
+ easy on-line replacement of failed disk mechanisms
+ highest storage connectivity
+ flexibility of configuration
administrator chooses the amount of space allocated to RAID 1 and
RAID S modes
+ potential for highest performance (especially for write-intensive applications
since writes are always done to the cache)
+ very large global cache (for all disk mechanisms)
+ automatic Open Storage Director failover with HP-UX Revision 10.0 (PVLinks)
+ performance approaches and possibly exceeds that of JBODs/HASS