Comparing ON-Bar and ontape

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Comparing ON-Bar and ontape

Table 4 compares ON–Bar and ontape. If you are switching to ON–Bar and ISM from ontape, note that ON–Bar works differently.

Table 4. Differences Between ON-Bar and ontape
Can the utility...	ON-Bar	ontape
Use a storage manager to track backups and storage media?	yes	no
Back up all database server data?	yes	yes
Back up selected storage spaces?	yes	no
Back up logical-log files?	yes	yes
Perform continuous logical-log backups?	yes	yes
Back up while the database server is online?	yes	yes
Back up while the database server is in quiescent mode?	yes	yes
Restore all database server data?	yes	yes
Restore selected storage spaces?	yes	yes
Back up and restore storage spaces serially?	yes	yes
Perform cold restores with the database server offline or in microkernel mode?	yes	yes
Initialize high-availability data replication?	yes	yes
Restore data to a specific point in time?	yes	no
Perform separate physical and logical restores?	yes	no
Back up and restore different storage spaces in parallel?	yes	no
Use multiple tape drives concurrently for backups and restores?	yes	no
Restart a restore?	yes	no
Rename a chunk pathname or device during a cold restore?	yes	yes
Perform imported restores?	yes	no
Perform external backups and restores?	yes	no
Change logging mode for databases?	no	yes

The ontape utility does not use the sysutils database or the emergency boot files. The ontape utility supports remote backup devices on other hosts but ISM does not. ISM supports different sets of tape drives on various hardware platforms.

The ontape utility supports two simultaneous sessions, one for physical backup or restore, and one for log backup. Each ISM instance has a limit of four simultaneous sessions.

You can use ON–Bar with third-party storage managers to obtain more sophisticated device support and storage management.

The ontape utility allows you to change the logging mode of a database. If you use ON–Bar, use ondblog to change the logging mode of a database.

Warning:

The backup tapes that ontape and ON–Bar produce are not compatible! You cannot create a backup with ontape and restore it with ON–Bar, or vice versa.