Fujitsu BS2OSD Manual De Usuario
Page 18
2.16 New functions in BS2000/OSD V6.0B with
Correction Package 2/2006
2.16.1 Autonomous, dynamic control of I/O resources (IORM)
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The new utility program IORM facilitates autonomous, dynamic
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control of the I/O resources, devices, controllers, channels
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(type S and type FC) and paths. Both S and SX servers are
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supported in native and in VM2000 operation.
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The following functions are implemented:
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- IOPT: I/O priority control for tasks with competing access
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to one device (I/O Priority Handling for Tasks)
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- DPAV: Dynamic I/O load distribution for S server disks
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on the FC channel (Dynamic Parallel Access Volume)
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- DDAL
Optimized load distribution in CentricStor operation
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(Dynamic Device Allocation)
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- IOLVM: Limiting of I/O throughput for single VM2000 guest
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systems (I/O-Limit for Virtual Machines)
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- TCOM: Adapting the compression for LTO devices
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(Tape Compression)
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The IOPT, DPAV and IOLVM functions control disks, the DDAL and
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the TCOM functions control tape devices.
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IORM links itself into the BS2000 I/O system and collects I/O
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data to determine the I/O resources utilization. IORM also
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periodically checks whether intervention in the I/O operation
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is required.
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The values set for intervention such as thresholds, selection of
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devices to be monitored or I/O priorities can be passed to IORM
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in the form of a parameter file or in dialog.
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IORM has a HELP function that outputs all permitted statements
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together with their syntax.
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You will find a detailed description in the SYSRME.IORM.060.E
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file or in the utilities manual.
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I/O-Priority control for tasks (IOPT)
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I/O-intensive but relatively unimportant applications can
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obstruct other, more important applications if the I/Os are on
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the same device or on devices on the same controller, path,
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port or channel.
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Three I/O priorities, low, medium and high, were therefore
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introduced for IORM.
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If the IOPT function is activated in IORM (IOPT_SET_ON=YES
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statement), IORM applies brakes to the tasks with low and medium
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priorities by assigning time penalties if these tasks hinder
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tasks with higher priorities.
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IORM does not affect tasks with I/O priority high.
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I/Os via FDDRL, ARCHIVE, VOLIN or PAGING are also not braked.