Filter
Top Products
48 Chapter 3
Functional and Operational Characteristics
3.7.18 FlashAccess
FlashAccess allows users to store specific data in cache memory. FlashAccess increases the
data access speed for the cache-resident data by enabling read and write I/Os to be
performed at front-end host data transfer speeds. The FlashAccess cache areas (called cache
extents) are dynamic and can be added and deleted at any time. The 9900 subsystem
supports up to 1,024 addressable cache extents.
FlashAccess operations can be performed for open-system LUs (e.g., OPEN-3, -8, -9) as well
as S/390
®
LVIs (e.g., 3390-3/9, 3380-K), including custom-size volumes. Use of FlashAccess in
conjunction with the Virtual LVI/LUN feature will achieve better performance improvements
than when either of these options is used individually.
Note: For further information on FlashAccess, please see the Hitachi Lightning 9900™
FlashAccess User’s Guide (MK-90RD004), or contact your Hitachi Data Systems account team.
3.7.19 Cache Manager
Cache Manager enables users to perform FlashAccess operations on S/390
®
LVIs by issuing
commands from the S/390
®
host system to the 9900 subsystem. For further information on
Cache Manager, please see the Hitachi Lightning 9900™ Cache Manager User’s Guide
(MK-91RD045), or contact your Hitachi Data Systems account team.