FDRARC is a high-performance data archival tool that can be used to control the consumption of your z/OS disk storage.
With FDRARC, unwanted and expired data sets can be quickly and efficiently migrated to a less expensive medium, such as a high-capacity tape, a VTS, or to a compressed format on another disk.
Migrated data sets are recorded in a control file and recataloged to a volser of MIGRAT. FDRARC's auto-recall facility ensures that a migrated data set can be easily and transparently recalled to disk if it is referenced by a batch job, online application, or an end-user.
Key Features & Benefits
FDRARC includes a report utility called FDRQUERY, which can be used to illustrate the effects of a data migration policy against one or more disk volumes using a range of “not-referenced” criteria.
In the example below, we are looking at all volumes belonging to the DFSMS Storage Group called ‘DEV’. The details for one volume (DEV002) are shown, together with the Summary report for all 6 volumes in the Storage Group.
The report shows that DEV002 is currently 80% allocated. If FDRARC was run against the volume to remove all data sets not referenced in the previous 30 days, the allocation would come down to 20%. 786 data sets would be removed from the volume (33,643 tracks), saving 77% of the allocated space.
If a less severe criterion were used for the migration, the savings would not be as high. The report shows the results of using ‘not-referenced-in’ criteria of 30, 60, 90 and 120 days.
The Summary report shows that, across all six 3390-3 volumes in the DEV Storage Group, the current allocation level is 74%. With 30-day migration criterion, this would be reduced to 34%, with over 1,100 data sets (nearly 120,000) tracks being reclaimed.
Tidying up Freespace with FASTCPK
By removing unwanted data sets from disk, FDRARC will naturally create areas of free space on a volume, and for best performance, these freespace areas should ideally be consolidated.
See the FASTCPK section for a quick and easy solution for consolidating free space on a volume into as few as one or two contiguous areas.
Although the price per megabyte of z/OS disk storage has dropped considerably over the past few years, the demand has increased in most installations. For this reason, disk storage remains a significant part of the Data Center budget.
The available DASD space at an installation, however cheap, needs to be used as efficiently as possible. Unfortunately, DASD volumes often contain datasets that no longer need to be on disk.
In many cases, datasets are created by a batch job or TSO user and never used again. Other datasets are used only on an infrequent basis—perhaps just once a year—and do not need to be on disk in the interim period. In addition, there are also the datasets that do not meet installation standards (e.g. uncataloged/expired) which need to be regularly dealt with.
FDRARC provides an excellent way to control the consumption of DASD resources by ensuring that expired or unwanted datasets are either deleted or moved to a less expensive medium (e.g. tape or compressed DASD).
For more introductory information on FDRARC, see the Product Portfolio Sheet
For more technical detail on FDRARC, see the Tech Detail section.
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