Hp XP P9500 Storage Bedienungsanleitung PDF herunterladen (Seite 6)

Parallel Access Volumes in dynamic mode

When Parallel Access Volumes is in dynamic mode, the number of alias devices assigned to each

base device may dynamically increase or decrease based on the number of I/O requests to each

device. Dynamic mode assists in balancing workloads on base devices and can optimize the speed

of accessing data in the P9500. A dynamic Parallel Access Volumes operation is implemented

when the WLM feature for Dynamic alias management setting and the WLMPAV parameter setting

in the HCD file are both set to YES.

In the following figure, the x10, x11, and x12 base devices were originally assigned two alias

devices each. In this example, as I/O requests converge on the base device x10 (indicated by the

large arrow), the number of alias devices for base device x10 increases to four, while the number

of alias devices assigned to the base devices x11 and x12 decreases to one each.

Parallel Access Volumes in static mode

When Parallel Access Volumes is in static mode, the number of alias devices assigned to each

base device does not change, even when the number of I/O requests to each device changes. A

static Parallel Access Volumes operation is implemented when the WLM feature for Dynamic alias

management setting and the WLMPAV parameter setting in the HCD file are both set to NO.

In the following figure, the x10, x11 and x12 base devices were originally assigned two alias

devices each. In this example, as I/O requests converge on the base device x10 (indicated by the

large arrow), the number of alias devices for each base device does not change.

Workload Manager

The Workload Manager (WLM) is a software component of the MVS/ESA®, z/OS®, and

OS/390® operating systems that enables the host computer to utilize the dynamic capability of

Parallel Access Volumes.

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Hp XP P9500 Storage Bedienungsanleitung Seite 6