G06.32 Software Installation and Upgrade Guide

G06.32 Installation and Fallback Alerts
G06.32 Software Installation and Upgrade Guide—546068-002
2-6
OSS Files Greater Than 2 Gigabytes (Large Files)
•
Format 2 OSS files larger than the 2 GB limit are no longer accessible through the
OSS file system and utilities, and DP2 returns an error for any operation other than
purging the files. However, you can access the files from the Guardian
environment by using Enscribe.
If the DP2 fallback SPR is not installed, you cannot access any Format 2 files using
either OSS or Enscribe on systems running an RVU earlier than G06.28, even if they
are smaller than 2 GB.
DP2 has a dependency on DSAP/DCOM. If you install the DP2 fallback SPR
(T9053AQS), you must also install T9543G08^ABJ.
DSAP/DCOM Migration and Fallback
Migration
The DSAPDDL file is changed in the product revision of DSAP/DCOM delivered in the
G06.29 RVU (T9543G08^ABJ), resulting in changes to the work-file layout. You must
use the DSAPDDL file distributed with T9543G08^ABJ when running ENFORM
queries on the work file created using this SPR. The DSAPDDL file for T9543G08^ABJ
contains these changes to the directory-record structure:
•
The field named fifth is changed from type binary unsigned to type binary 32
unsigned.
•
These fields are added to the end of the structure:
°
Field flab2_flags1 of type binary unsigned identifies OSS files larger than 2
GB.
°
Field ext-0-fsu of type binary unsigned contains the extent size of large
OSS files for extent number 0.
°
Field ext-1-128-fsu of type binary unsigned contains the extent size of
large OSS files for extent number 1-128.
Fallback
The product revision of DSAP/DCOM delivered in the G06.29 and later RVUs
(T9543G08^ABJ) is “large OSS file safe”, but product revisions delivered in earlier
RVUs are not. The aforementioned migration considerations apply. If you fall back to a
pre-G06.29 RVU, HP recommends that you install T9543G08^ABJ during the fallback.
DP2 has a dependency on DSAP/DCOM. If you install the DP2 fallback SPR
(T9053AQS), you must also install T9543G08^ABJ.
Note. An application that is “large file safe” causes no data loss or corruption when it
encounters an OSS file larger than 2 GB. It might not be able to process OSS files larger than
2 GB, but it has the appropriate logic to handle errors or warnings detected during file
manipulation operations and fail gracefully.