z/VM: CP Commands and Utilities Reference - z/VM - IBM

QUERY MDCACHE
becomes available to CP, it is added to the minimum/maximum MDC size value.
This data is shown only if the pending amount is not equal to zero.
max=nnnM
indicates the current maximum value for the size of minidisk cache in
megabytes. For expanded storage, this may change as the CP partition size
changes.
usage=ppp%
indicates the percentage of expanded storage or main storage in use by
mindisk cache.
bias=bb.b
indicates the bias factor used by the arbiter to determine the target size for the
storage type.
Response 2:
The following response is issued when you specify QUERY MDCACHE SYSTEM
and caching is disabled for the system.
Minidisk cache OFF for system
Response 3:
The following response is issued when you specify QUERY MDCACHE RDEV rdev.
Minidisk cache {DFLTON } for rdev
{DFLTOFF}
{OFF }
rdev
identifies the real device number of the device being queried.
Response 4:
The following response is issued when you specify QUERY MDCACHE RDEV
rdev-rdev.
Minidisk cache {DFLTON } for rdev-rdev
{DFLTOFF}
{OFF }
rdev-rdev
identifies the first and last real device numbers in the range.
Response 5:
868 z/VM: CP Commands and Utilities Reference
The following response is issued for each active real device when you issue
QUERY MDCACHE RDEV rdev DETAILS or QUERY MDCACHE RDEV rdev-rdev
DETAILS. The additional lines for each real device contain cache eligibility
information for any active minidisks on that device. The first ON/OFF for each
minidisk indicates whether caching is currently enabled for the minidisk. The
information in parenthesis which indicates that cache setting for the minidisk plus
the cache setting for the real device add up the current cache eligibility of the
minidisk.
Minidisk cache {DFLTON } for rdev {ON } ({ON } for userid vdev)
{DFLTOFF} {OFF} {OFF }
{OFF } {DEFAULT}
rdev
identifies the real device number of the device being queried.