Hitachi 9900 manual Cache Manager Host Agent

Hitachi Data Systems

Figure 29 – The GUI interface on Graph-Track software simplifies performance management.

Hitachi VLVI Manager software improves performance.

scrutinizes activity all the way to the logical-device level, reporting on channel- interface-processor usage rates, cache-usage rate by function, and logical-device utilization. This data pinpoints specific activities that may have a negative impact on operations, and lets the user fine-tune the system so that it can be used to maximum advantage.

Graph-Track software also highlights valuable cache information. Cache

read/write and read-hit ratios are reported in real time. Each system connected to Graph-Track software can be tuned separately.

11.Hitachi Virtual Logical Volume Image Manager Software for S/390 Environments Allows Very Large to Very Small Virtual-volume Configuration

Hitachi Virtual Logical Volume Image (VLVI) Manager is a mainframe software utility that optimizes Lightning 9900 V Series system capacity utilization by allowing users to configure multiple virtual LVIs in place of an LVI. Data volumes as small as a single cylinder or as large as a full 3390-9 can be defined. Volume size is determined in cylinder increments. Each VLVI requires one physical address, with a maximum of 4096 addresses per Lightning 9900 V Series system. Different types of LVIs can coexist within an array-group with no need to convert them to a common LVI. This feature maximizes array-group capacity and enhances configuration flexibility. Hitachi VLVI Manager software improves performance by reducing logical-device contention and operating-system queuing. It also boosts remote copy performance by avoiding the need to copy the entire volume.

12. Cache Manager Host Agent

The Cache Manager Host Agent enables mainframe users to perform FlashAccess software operations on S/390 LVIs by issuing commands from the S/390 host system to the Lightning 9900 V Series system.

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