STORE and TurboSTORE/iX Products Manual (B5151-90003)

Chapter 3 51
Preparing Storage Devices
Preparing Tape and DDS Devices
If you gave the backup devices a single filename such as:
:FILE T;DEV=TAPE
enter the following STORE command to copy files to a set of four parallel backup devices:
:STORE @.@.@;;STORESET=(*T),(*T),(*T),(*T)
Describe parallel devices in the STORESET parameter by enclosing each backreferenced
device filename within parentheses. Use commas to separate devices.
Using Parallel Device Pools
Parallel device pools are multiple sets of sequential devices used in parallel. Using parallel
device pools is often the most efficient way to store a large set of files when you have
several backup devices. Parallel device pools give you the advantages of both parallel and
sequential devices. You copy file subsets to different devices simultaneously, and can have
another sequential device ready when the media is filled in any device pool.
Figure 3-10. illustrates a parallel device pool backup.
Figure 3-10. Parallel Device Pools
Up to eight serial backup devices are currently supported within a parallel device pool.
Maximum performance is obtained by using three or four parallel sets, each consisting of
two sequential devices.
To store files to parallel device pools, use parentheses to group the devices into pools.
Separate the devices in the pool from one another with commas. Commas also separate
each device pool. For example, the following commands copy files to two parallel device
pools. Each device pool contains two sequential devices. In the following example, STORE