Digital Equipment HSZ40, Справочное руководство

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REDUCE 2–47
HSZ40 Array Controller CLI Reference Manual
REDUCE
__________________________ Note _____________________________
The nominal number of members in a mirrorset is the number given in the
SET
mirrorset-name
MEMBERSHIP
=number-of-members command. The actual number
of members may be less than the nominal number if you do not add devices to
the mirrorset or if you remove a member. The actual number of members can
never be greater than the nominal number of members.
____________________________________________________________
Removes member disk drives from mirrorsets and decreases the nominal number of
members in the mirrorsets. The controller does not put removed members in the failedset,
as with the
SET
mirrorset-name
REMOVE
=disk-name command. When using the
REDUCE
command to split off a copy of a striped mirrorset, you must reduce all mirrorsets at the
same time with one command. The
CLONE
program does this automatically.
The disks to be removed do not need to be members of the same mirrorset. However, the
devices must be part of the same unit (for example, the same striped mirrorset). The
controller pauses I/O to the unit while it removes the specified mirrorset members.
__________________________ Note _____________________________
A
NORMAL
member is a mirrorset member whose entire contents are guaranteed
to be the same as all other
NORMAL
members. Only normal members can be
reduced. An error is displayed if you attempt to reduce the only normal
mirrorset member.
____________________________________________________________
Note that for each mirrorset that you reduce, there must be at least one remaining
NORMAL
member after the reduction. If this is not true for all disk-names specified, then none of the
mirrorsets are reduced.
Format
REDUCE
disk-name1 [disk-nameN]