STORE and TurboSTORE/iX Products Manual (B5151-90003)
112 Chapter6
STORE and TurboSTORE/iX Command Options
STORE Options
If you want to create a 7x24 true-online backup with the sync point at the end of the
backup, and do not want a disk directory file to be created, specify the NOSTOREDIRECTORY
or NOSTOREDIR option on the STORE command line.
Storing Files in Interleave Format (INTER)
With STORE, TurboSTORE/iX II, and TurboSTORE/iX 7x24 True-Online Backup, you
have the capability of simultaneously reading information from different files on multiple
disk drives and storing the accessed information on the backup device in a single
operation.
This process called interleaving allows you to match slow input devices (such as disk
drives), with fast output devices (such as streaming tape devices). This effectively
increases the input rate.
By varying the number of concurrent input operations, the effective input rate can be
matched with the output rate. This allows the backup to execute closer to the speed of the
output device.
When you STORE files in interleave format, STORE:
1. Partitions the set of files to your backup device or devices.
2. Opens the files. It may (depending upon file characteristics), access several files at the
same time.
3. Interleaves files on the same backup to make sure that your backup device or devices
operate at the highest speed possible.
Interleave format significantly reduces the time necessary to store a large set of files, such
as when performing a full system backup. It merges the stream of data from multiple files
on separate disks into a single stream of data sent to the backup device or devices. If
necessary, STORE processes files out of sequence to keep backup devices operating
efficiently.
Interleave format is most efficient when your fileset is evenly spread across two or more
system disks. Use sequential devices or parallel devices alone when the set of files to store
is smaller and less evenly distributed, such as when doing a partial backup, or if the files
are only coming from one disk.
To STORE files in interleave format, use the INTER parameter. For example:
:FILE T;DEV=TAPE
:STORE @.OPERATOR.SYS;*T;INTER
When these files are restored, RESTORE will automatically recognize the interleave format
and restore the files properly.
Using the STORESET and INTER parameters together improves backup time on large
systems. For example, the following STORE command uses both parallel device pools and
interleaving to minimize backup time:
:STORE @.@.@;;SHOW=OFFLINE;&
STORESET=(*T,*T),(*T,*T);INTER