HP 3000 Manuals HP 3000 Manuals
>BACKUP
The >BACKUP command releases files so a backup can be performed on the
secondary system.
SYNTAX
>BACKUP [configfile]
PARAMETERS
configfile The name of the configuration file to be backed up.
DISCUSSION
When the >BACKUP command is issued, Silhouette searches for a quiet
period when no multi-step transactions are in progress on the secondary
database. During this search, a >STATUS request displays the message
Backup pending. When Silhouette finds a quiet period, the message Now
appears, indicating that the databases have been released for storing.
(If there is only a short wait for a quiet period, the Pending message
may not appear.) Silhouette on the secondary system closes the databases
allowing you to perform a backup. Then all databases and files specified
in the SAVE = and the LOG = lines in the currently active configuration
file are stored to magnetic tape.
When the backup is complete, the >RESUME command is issued on the primary
system to resume processing on the secondary system. Silhouette
automatically retrieves any queued transactions from the primary system,
and brings the secondary system up-to-date.
The Silhouette recovery software requires the >BACKUP request be posted
to the logfile on the primary system. Since the log record is the signal
to the secondary system to look for a quiet period, it may take a period
of time before the command is acted upon. When the >STATUS command
displays the message Backup pending, this indicates that the secondary
system has seen the request. When the secondary system finds a quiet
period in the transaction stream, the >STATUS command displays the
message Backup: Now indicating the secondary database is available for
backup.
NOTE Issuing the >RESUME command cancels a >BACKUP command waiting for a
quiet period.
EXAMPLE
The following example shows a typical Silhouette STATUS screen as it
appears when a backup is pending.
>BACKUP
Backup req. to RP: Backup pending on outstanding transactions. (RQMSG 38)
>STATUS
================ S i l h o u e t t e S T A T U S =================
1:34:57
* PRIMARY SECONDARY
- - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - -
LOGFILE record # = 4675 (001) | LOGFILE record # = 4623 (001)
time = 1:34:54 | time = 1:30:36
|
outstanding= 52 recs | FLAGS Backup: Pending
max ever = 4674 recs |
|
SENT logical = 4675 recs | DATABASE opens = 3 paths
physical = 198 blocks | transact. = 2 outst.
|
[ current status ] | [ current status ]
- - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - - -
LINES OPEN : MPEXL950
=============================================================================
>
ADDITIONAL DISCUSSION
See Chapters 3 and 5.