VSE/VSAM for VM Version 6 Release 1 (5686-081)
VSE/VSAM (5686-081) was with withdrawn from marketing September 30, 2005.
VSE/VSAM (5686-081) ends service February 28, 2007.
- Supports data compression for VSAM datasets
- Improves system performance through hardware data compression
- Reduces the processor time required to perform data compression
- Requires no changes to application programs
- Provides additional CMS virtual storage constraint relief below the 16MB line
- Supports RAMAC** Array Family
Data compression for VSAM datasets
VSE/VSAM for VM Version 6 Release 1 supports data compression for VSAM
datasets. You can easily select which datasets to store and hold in
memory as compressed datasets, and which datasets should remain
expanded. VSAM will exploit the S/390 hardware-assisted compression
feature, if available on the processor; otherwise data compression is
provided by software algorithms. Data compression provides the
Most application programs can use data compression. No changes are required to realize the benefits of data compression and improved exploitation of 31-bit addressing. You only need to specify which files are to be compressed.
Further 31-bit exploitation
The exploitation of 31-bit addressing, which was introduced with
VSE/VSAM Version 2 Release 2, is continued and provides additional CMS
virtual storage constraint relief below the 16MB line. The following
VSAM control blocks are moved above the 16MB line:
Device Support - IBM RAMAC array family
The IBM RAMAC Array DASD and Subsystem are high-performance RAID-5 (redundant array of independent disks -- level five) fault tolerant disk arrays. Earlier levels of VSE/VSAM for VM support both the RAMAC Array DASD, model 9391, and the RAMAC Array Subsystem, model 9394. VSE/VSAM for VM Version 6 Release 1 provides performance enhancements for the RAMAC Array DASD, model 9391.
Overview of VSAM releases supported on VM releases
|VM/ESA Rel 1.5 (370 Feature)||Yes||No(*)||No|
|VM/ESA Rel 1.1||Yes||No(*)||No|
|VM/ESA Rel 2.0||Yes||No(*)||No|
|VM/ESA Rel 2.1||Yes||Yes||No|
|VM/ESA Rel 2.2||No||Yes||No|
|VM/ESA V2 Rel 1||No||Yes||Yes|
Note (*)When VSE/VSAM V2.2 or V6.1 or VSE/ESA is licensed, VSE/VSAM V2.1 can be ordered without charge.
For additional information refer to IBM Announcement Letter 295-244 dated June 12, 1995.