RTD | RealTime Defrag
RealTime Defrag (RTD) provides automatic and easily controlled z/OS DASD volume maintenance for the 24×7 operating environment, without the disruption to production schedules which legacy defrag and volume maintenance products engender, and with high throughput due to its advanced multiple address space architecture. Today the availability and reliability of your organization’s data is critical to its success. But finding the time required to keep your systems operating efficiently often strains a data center’s resources and its ability to meet service level agreements. In order to utilize available resources more efficiently, more and more computer centers are optimizing their disk space with RealTime Defrag (RTD).
RTD Version 8.0.0 is a complete replacement for RTD 7.5.0x and earlier releases, and includes the following optional features:
♦ PM – Preserve Mirror Support provides full support for devices using Remote Pair FlashCopy to maintain business continuity in z/OS environments with continuous dataset operations. Additional RTD selection filters and processing options allow the user to easily control this environment. FRO is a pre-requisite for PM.
♦ FRO – The Fast Replication Option allows optimal I/O performance and reduced dataset enqueue contention by letting I/O operations run as a background task in the I/O device controller, rather than being executed by channel programs in an RTD address space. Since the operation is almost instantly complete from the viewpoint of RTD processing, datasets are enqueued for significantly shorter periods when data movement takes place. FRO supports FlashCopy V2 devices as well as Virtual Array devices.
♦ MAS – Multiple Address Space Support allows concurrent processing of up to 28 volumes and circumvents the MVS TIOT size limit which restricts the number of allocations (about 3,200) within an address space.
The main new features of RTD Version 8.0.0 are:
♦ Previously (since Version 7.0) RTD has supported its three functions (RELEASE, COMBINE, DEFRAG) for the track managed area of an EAV volume (basically a model 54 volume). With version 8.0, this support is now extended to the cylinder managed area of EAV volumes.
♦ RTD/RIO now provides the EAVAREA parameter of the volume level SET statement. The options TMA, CMA or BOTH specify whether the track managed area (TMA), cylinder managed area (CMA) or both (BOTH) should be processed if the SET statement is selected. In addition the CMAPOLICY parameter can be used to determine the aggressiveness of DEFRAG processing in the CMA area.
♦ New algorithms for the candidate extent selection and free space selection have been developed for CMA processing. In addition, the new candidate selection can also optionally be used for TMA processing. This is expected to give improved and more flexible DEFRAG performance in many cases. The option is invoked by specifying the new TMAPOLICY parameter on the volume level SET statement or by specifying neither TMAPOLICY nor DEFRAGPOLICY, in which case TMAPOLICY=1 is assumed by default. The old mechanism is still available and can be invoked by specifying DEFRAGPOLICY=5 or 6 without the TMAPOLICY parameter.
♦ The RELEASE function will now ensure that an empty SMS compressed dataset does not get space reduced below the size necessary to perform compression when the dataset is filled.
♦ The global function statements SET statement has been extended with the GSI=n parameter. This specifies the general scheduling interval to be used if the CONFIG=Z (null configuration) option is also specified (for real configurations the general scheduling interval is specified as part of the configuration, and the GSI parameter is ignored). Up until now the scheduling interval of the previously active configuration continued to be used.
♦ The channel programs for performing ERASE of free extents have been improved, reducing the length of channel programs and time for execution.
♦ The device type in statistics is now qualified with the model/type, such as 3390-3.
♦ Volume count of volumes processed in last cycle has been added to messages RTDD19I and RTDD25I. The MAXDATA percentage (if applicable) is now issued via a new message RTDD26I.
♦ RTD/RIO no longer displays the differences in fragmentation index obtained via the z/OS LSPACE macro. Instead it displays the reduction in number of free extents on the volume.
RTD/RIO End of Service Dates are:
♦ Product maintenance support for RTD Version 7.5.0x will terminate on 01 January 2016
♦ Product maintenance support for RTD Version 7.3.0x will terminate on 01 January 2015
♦ Product maintenance support for all RTD versions prior to RTD/RIO Version 7.3.0x has been terminated
* RTD is owned by INTERCHIP AG
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