copysel Directive: Specifying the Copy Sequence for Staging

The configuration option, copysel, in the stager.cmd file allows changing the stager copy selection sequence per file system.

By default, the copy selection for staging is from copy number 1 to copy number 4. Copy number 1 is selected first, then copy 2, then copy 3, and finally copy number 4. You can change the stager copy selection sequence for each file system by entering values 1 through 4 for n for the configuration option, copysel = n1:n2:n3:n4. Four copies, n1 through n4, must be defined even if four copies are not available.

The following is an example of a log file that shows the result of the stager.cmd operation.

Example 15-5 Log File of the stager.cmd Operation

logfile = /var/opt/SUNWsamfs/log/stager
drives = hp30 1
copysel = 4:3:2:1
fs = samfs1
copysel = 3:1:4:2
streams
dk -maxsize 2G -maxcount 10000
endstreams

The log file in the above example is interpreted as follows:

• The log file is in the /var/opt/SUNWsamfs/log/stager directory.

• The media drive, HP30, is allowed to use only one drive for staging files.

• By default, the stager selects copies in the order 4, 3, 2, and 1, for staging the files.

• For the file system samfs1, the stager selects copies in the order 3, 1, 4, and 2 for staging the files.

• The maximum size of the stream for the dk media type is 2 Gbytes, and the maximum file count for each stream is 10,000.

For more information, see stager.cmd(4) in Sun QFS and Sun Storage Archive Manager Reference Manual.