[Bugs] [Bug 1267950] need a way to pause/stop tiering to take snapshot

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1267950



--- Comment #7 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/12304 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit 36974c36fa4231df3f0e9428a9da6d1aa33348ab
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Mon Oct 5 19:52:02 2015 +0000

    cluster/tier: add pause tier for snapshots

    Snaps of tiered volumes cannot handle files undergoing migration.
    We implement a helper mechanism to "pause" migration. Any files
    undergoing migration are aborted. Clean up is done to remove
    sticky bits and data at the destination. Migration is restarted
    after snap completes.

    For testing an internal switch is added. It is not exposed externally.

    gluster volume set vol1 tier-pause [true|false]

    Change-Id: Ia85bbf89ac142e9b7e73fcbef98bb9da86097799
    BUG: 1267950
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/12304
    Reviewed-by: N Balachandran <nbalacha at redhat.com>
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>

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