Reference Architecture

Follow the configuration recommendations in this section to reduce tape hardware and tape media problems. These recommendations also minimize the time that the archiver uses the tape drives, which frees the table drives to be used more for staging files.

The hardware is the primary factor that drives the configuration. Most storage environments are similar to the following setup:

One tape library
One media type
Ten or fewer tape drives (most sites have four)

Based on this hardware configuration, use the following global parameters:

If disk archiving is in place, use the following settings:

allsets -sort path -offline_copy stageahead  -reserve set
allsets.1  -startage 10m  -startsize 500M -startcount 500000 -drives 6 -archmax  1G
allsets.2  -startage 24h -startsize 20G -startcount 500000 -drives X  -archmax 24G
allsets.3  -startage 48h -startsize 20G -startcount 500000 -drives X  -archmax 24G

Note - Although disk archiving is not required, it provides advantages to use disk archiving now that the tape media is getting larger. Disk archiving protects data while it accumulates to provide larger write operations (20 GBytes for each write operation).

If you cannot wait as long as eight hours before a file is written to tape, you should use disk archiving.

If disk archiving is not in place, use the following settings:

allsets -sort path -offline_copy stageahead  -reserve set
allsets.1  -startage 8h    -startsize 8G   -startcount 500000 -drives X -archmax  10G
allsets.2  -startage 24h -startsize 20G -startcount 500000 -drives X  -archmax 24G

The releaser.cmd file should be changed to:

list_size = 300000

The stager.cmd file should have these values:

maxactive  =  500000  # If server has more than 8G of RAM
maxactive  =  100000  # If server has less than 8G of RAM

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