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HP NonStop Shadowbase Command Definitions

Collector Command Descriptions

HP NonStop Shadowbase Command Reference Manual—785421-002

NUM ABORTING shows the number of aborted transactions currently being

tracked.

ABORT TIMER shows whether the ABORT TIMER is on or off for the aborted

transactions currently being tracked. (The ABORT TIMER helps resolve

certain specific TMF recovery scenarios such as when a TMF

failure/restart has occurred).

NUM PEER TRANS NO AUDIT shows the number of the peer-CONS’s pre-started

transactions that have not yet yielded audit events.

RESERVED BUFFER INFO – This section displays reserved buffer

statistics. These buffers are allocated and used to pre-read the audit trail

data in preparation for sending them to the Consumer(s). If the Collector

is not "caught up" (i.e.,i.e., the number of EOFs is not increasing), one can

attain higher throughput if there are reserved buffers in use (The reserved

buffers are ready and waiting for the Consumer(s) to be available to take

their contents).

NUM ALLOC shows the number of reserved buffers allocated.

CUR USED shows the number of reserved buffers currently in use.

MAX USED shows the maximum number of reserved buffers that have been

in use since the STATS started to be gathered.

BI-DIRECTIONAL PEER CONSUMER FAILURE INFO – This section

displays the timestamp of the last peer consumer failure and the total

number of times it has failed. This section is only displayed for bi-

directional environments and only when the peer consumer has

failed at least once.

VOLUME/FILE RECOVERY INFO – This section displays information

about any volume or file recovery that occurred for this collector. It shows

the number of times recovery happened as well as the timestamp and

audit trail location of the first and last recovery events. This section is

only displayed after the first time volume or file recovery occurs for

the collector.

PRESCREEN SUBVOLUMES – The Collector will build a list of up to 8

distinct subvolume names (not including the volume name, like $DATA1)

from the SOURCEFILE parameter for all of your DBS objects. This list will

be checked first for a match against the file name for an incoming audit

trail event. If a match doesn’t occur, the Collector will discard the event

immediately and continue with the next event in the audit trail (this

“prescreening” is occurring sooner in the selection cycle than in the past).

This approach will optimize the Collector’s cpu usage for environments

where there is lots of activity for many different subvolumes on a system

and the related Collector is not selecting these subvolumes for replication.

For the second part, called Filename Prescreening (recorded under the

heading

‘FILE NAME SEARCH LIST INFO’), as well as for environments where

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