StorageTek Host Software Component 6.0, Руководство системного программиста

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286 VM/HSC 6.0 System Programmer’s Guide
1st ed., 6/30/04 - 312579601
Parameters
ACS
specifies one ACS in the library in which the scratch volumes are to be redistributed.
(acs-id)
identifies the ACS. The one or two digit hexadecimal ACS identifier.
LSM
optionally, specifies that only certain LSMs within an ACS are to contain scratch
cartridges (if not specified, scratch volumes are redistributed across all LSMs in the
ACS).
(lsm-list)
lsm-list can be a single LSMid or a list of LSMids. An LSM range is not
allowed. An LSMid ( lsm-id ) is made up of the ACSid (hexadecimal 00-FF) and
the LSM number (hexadecimal 00-17) separated by a colon (:).
The element(s) contained in an lsm-list must be enclosed in parentheses;
multiple elements must be separated by blanks or commas.
SUBpool
optionally, specifies the subpool name from which scratch volumes are to be
redistributed.
(subpool-name)
subpool-name identifies the subpool.
BALtol
optionally, specifies a balance tolerance value. Scratch volumes are distributed based
on this specified value.
(tolerance-value)
tolerance-value specifies a percent value that identifies when cartridge
redistribution ends. Valid values are 1 through 999, where the values indicate a
percentage from .1 to 99.9 (i.e., 1 signifies .1 percent; 999 equals 99.9 percent).
The initial value for the HSC is 1. If tolerance-value is not specified in this
utility, HSC uses the initial value for scratch redistribution.
The utility finishes redistributing scratch cartridges when the percentage of
scratch tapes in all specified LSMs is within tolerance-value / 2 percentage
points of each LSM’s percentage of cells in the ACS.
For example, assume an ACS has one 4410 LSM with 5,000 cells, one 9360
(WolfCreek) LSM with 1,000 cells, and 600 total scratch tapes in the ACS.
Scratch Redistribution attempts to put 500 scratches in the 4410 and 100
scratches in the 9360.
Entering BALtol(100) specifies a setting of 10 percent, which means that the
utility ends when all LSMs are within ±5 percent of the expected number of
scratches for each LSM (500 for the 4410, 100 for the 9360).
Scratch Redistribution