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ibrix_crr

Starts and stops the replication process and monitors the state of replication activity.

Description

The Continuous Remote Replication service (CRR) provides a transparent method to replicate

changes in a source file system on one cluster to a target file system on either the same cluster or

a second cluster. The remote replication service has two modes: continuous and run-once. For

detailed information about these modes, see the HP StoreAll Storage File System User Guide.

Replication tasks are started from the source cluster with ibrix_crr -s. When a replication task

is started for a file system, ibrix_crr dynamically generates a new task with a unique task id

for the replication instance.

Use ibrix_crr -s without the -o option to start a continuous replication task. A continuous

replication task does an initial full synchronization and then continues to replicate any new changes

made on the source. Continuous replication tasks continue to run until manually stopped by the

user.

Use the ibrix_crr -o option for the run-once mode to synchronize single directories or entire

file systems on the source and target in a single pass. The run-once tasks terminate on their own

when the synchronization is completed. Any task can be stopped manually if necessary.

Multiple replication tasks (run-once and/or continuous) can be started simultaneously.

Command options to get the status of replication can be executed from either the source cluster or

the remote target cluster.

NOTE: Remote replication must be configured (clusters registered with each other, and remote

replication exports configured) before replication tasks to remote clusters can be started. For detailed

information about configuring remote replication, see the HP StoreAll Storage File System User

Guide.

NOTE: While continuous replication tasks ensure that file systems remain synchronized, run-once

tasks replicate a single-pass state of the source, and therefore can experience variations if there

is I/O activity while the task is running. For example, if the source file foo.txt has already been

replicated by the active task and is then edited or deleted while the run-once task is still active, the

changes to foo.txt are not made on the target. The foo.txt file on the target remains as written

by the run-once task.

NOTE: If a source or target file system is unmounted and ibrix_fsck is run to check it, a full

resynchronization is recommended.

Synopsis

Start a continuous or run-once remote replication task to a remote cluster:

ibrix_crr -s -f SRC_FSNAME [-o [-S SRC_DIR] ] -C TGT_CLUSTERNAME -F

TGT_FSNAME [-X TGTEXPORT] [-P TGTDIR] [-R] [-e EXCLUDE_PATTERNS]

The source file system to be replicated.-f SRC_FSNAME

The remote target cluster.-C TGT_CLUSTERNAME

The remote target file system.-F TGT_FSNAME

The remote replication target (exported directory). The default is the root of the file

system.

-X TGTEXPORT

NOTE: This option is used only for replication to a remote cluster. The file system

specified with -F and the directory specified with -X must both be exported from the

target cluster (target export).

A directory under the remote replication target export (optional). This directory must

exist on the target, but does not need to be exported.

-P TGTDIR

44 StoreAll software commands

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