Platform-specific Backup Requirements

Be aware of backup requirements for AIX and IBM Linux.

Be aware of the following platform-specific backup requirements:

Tape devices on AIX systems can be configured for either fixed- or variable-length block mode. See the Installation and Configuration Guide for information on how to show and change the block mode. SAP Sybase IQ BACKUP does not support fixed-length block mode.
On IBM Linux on POWER, to back up an IQ database to SCSI tape, you must set the block size of the device to accept variable-length data transfer. Before performing any IQ backups, set the SCSI tape device's default block size. Log in as superuser and run the Linux shell command mt, as follows:
```
mt -f /dev/st0 defblksize 0
```