H06.09 Software Installation and Upgrade Guide

H06.09 Installation, Migration, and Fallback

Considerations

H06.09 Software Installation and Upgrade Guide—544316-002

2-7

Backup and Restore 2 Fallback

OSS files larger than 2 GB that have been backed up cannot be restored to a pre-

H06.06 system. Install the Backup and Restore 2 fallback SPR T0744H01^AAA to

restore files smaller than 2 GB in the following situations:

•

If you have a backup tape with a mix of OSS files smaller than 2 GB and larger

than 2 GB. You can restore the smaller files to an H06.05 file set by first installing

T0744H01^AAA.

•

If you have created backup tapes on H06.09 and you are falling back to H06.05.

Files larger than 2 GB are skipped. T0744H01^AAA does not support pre-H06.05

RVUs.

Guardian Compatibility Issue

OSS support for files greater than 2 GB has resulted on a compatibility issue for

applications using Enscribe APIs to access Guardian files created by OSS APIs.

Prior to the H06.06 RVU, Guardian files created by OSS APIs were always created as

Format 1 with a 175 MB maximum size. As of H06.06, Guardian files created by the

open() and creat() functions are Format 1 with an approximate 2 GB maximum

size, and Guardian files created by the open64() and creat64() functions are

Format 2 with an approximate 26 GB maximum size.

The standard OSS utilities, such as cp, pax, and pinstall, now use open64() and

creat64(), and thus create a Guardian Format 2 file when given a /G output file

name. For example:

cp myfile /G/mydisk/mysubvol/myfile

Guardian applications that use file data and ignore file attributes are unaffected. An

application that performs a 32-bit FILE_OPEN_ of a Format 1 file will successfully open

a Format 2 file as long as the file’s EOF is less than the Format 1 limit of approximately

4 GB.

Guardian applications that use file attributes such as file format and maximum size are

likely to be affected. These programs might fail when unexpected values are returned

(such as Format 2 if only Format 1 is expected).

If a Format 2 file does cause a program to fail, the programmer can do one of the

following:

•

Change the program to accept Format 2 files.

•

Protect the program by converting the file to Format 1 using the following

commands:

FUP CREATE TEMP, FORMAT-1, TYPE U, CODE 180, &

EXT (28,1400), MAXTENTS 749

FUP COPY MYFILE, TEMP