HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure User Manual page 207

• Skip validation. If the line is a validation command it is ignored.
In the validate-only and skip validation cases, job transactions and branches within validation commands
are ignored.
Resource validation processing in transactions
Special cases exist for validation commands in a transaction block:
• Validate-only. The validation command in the transaction block is not executed.
• Skip validation. The validation command in the transaction block is executed.
See also job transactions.
Wait/nowait argument
Some job commands include a wait/nowait argument. Values are:
• Wait. When the job is run, issue the command, then wait until the command has been completed
before going to the next task in the job.
• Nowait. When the job is run, issue the command, then immediately go to the next task in the job.
In general, use wait when you need to ensure that all aspects of a command have been performed by
the command before any other task in the job is performed. Use nowait, when other tasks in the job
do not depend its completion.
Wait/nowait for discovery
When you include a local replication command in a job, the wait/nowait for discovery argument requires
that you specify whether or not to wait until the new replica is discovered before executing the next step.
Choices are wait and nowait. For example, in the job below, the replication manager waits at line 7 until
the new replica is discovered, before executing line 8.
Line Task
...
$Rep1 = SnapshotHostVolume ( "%\\source_host\source_hostvol1%", FULLY_ALLOCATED, SAME,
7
WAIT ) onerror pauseat E1:
8
//
...
With both choices, the replica is instantly created on the storage system. With the nowait choice, the
replication manager immediately executes the next job step, whether or not its database of resources has
been updated with the new replica information. With the wait choice, the replication manager does not
execute the next step until its database of resources has been updated with the new replica information.
Typical use of nowait with wait-for-discovery commands
The nowait for discovery option is typically used in conjunction with the
and WaitForStorageVolumesDiscovery
suspended while being locally replicated.
For example, the general structure of a job to replicate a database might be:
1. A launch command suspends the database I/O.
2.
A local replication command instantaneously creates a replica. The command uses the nowait
option so that the next step (resuming I/O) is immediately executed.
3. A launch command resumes the database I/O.
4.
With I/O resumed, a WaitForStorageVolumeDiscovery command causes the job to wait until the
replica is detected by a forced discovery of storage volumes. The helps ensure that subsequent
steps that involve the new replica, for example a mount step, will be valid.
commands to minimize the amount of time that a database is
HP StorageWorks Replication Solutions Manager 4.0.1
WaitForStorageVolumeDiscovery
207