HFS
The Hierarchical File System (HFS) allows you to store data on the IBM VSE mainframe in a hierarchical manner similar to that used on PCs and LINUX.
Store and retrieve any type of data--ASCII/EBCDIC, PC file types, etc.--on the mainframe transparent to applications
Use longer, more meaningful file and directory names--up to 256 bytes in length--including imbedded spaces and special characters
Access the HFS using any number of directories/subdirectories provided the name does not exceed 256 bytes in length.
Files on the mainframe are processed using physical IOCS
Data can be moved to and from HFS using:
• FTP
• RAAD
• Entrée
• Batch processing
• User-written programs
Updates to HFS extents can be journaled for dynamic data recovery between backups
Multiple partitions and/or subtasks can access the same HFS extent for both input and output--individual files within the HFS extent are locked as required to prevent collisions
The HFS directory can be cached, substantially reducing the number of I/Os needed to access individual files within the HFS extent
An individual HFS can have multiple DASD extents, so the HFS can get to be quite large if desired (current maximum is ~133 gigabytes.) You can define multiple HFS extents so the sky is the limit on the amount of data you can store with HFS.
Data can be encrypted on the HFS using DES, DES3 or AES128 algorithms.
Without making any programming changes, legacy applications can write data to and read data from an HFS.
HFS provides an extensive file conversion facility that can convert your legacy data to a form useable by an external application. You can also convert it back from the external format to legacy format.
Transparent access to HFS from your PC is available using WebDrive which can be found at www.webdrive.com.
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