[Bugs] [Bug 1283288] New: cache mode must be the default mode for tiered volumes

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1283288

            Bug ID: 1283288
           Summary: cache mode must be the default mode for tiered volumes
           Product: GlusterFS
           Version: 3.7.6
         Component: tiering
          Assignee: bugs at gluster.org
          Reporter: dlambrig at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org
        Depends On: 1282076



+++ This bug was initially created as a clone of Bug #1282076 +++

Description of problem:

Make cache mode the default for tiering

Version-Release number of selected component (if applicable):


How reproducible:

always

Steps to Reproduce:
1. 
2. 
3.

Actual results:

test mode is default

Expected results:

cache mode is default

Additional info:

test mode is for internal QE testing and should not be used by customers. Test
mode forces all unused data to be destaged from the hot tier when no IO is
received, rendering the SSD unused / wasted. If the demote cycle time is made
large as a workaround, data will stay on the hot tier but will not react to
changing conditions, which means unused data may fill the hot tier resource. A
long cycle times also means the system will stay static even when close to
full, which will put the system into a degraded mode. 

The cache mode is supposed to keep data on the hot tier but also demote data
quickly when the hot tier is close to full. The cycle time can be set to a
desired reaction time to swap out lesser used data and bring in more frequently
accessed data without flushing the entire SSD.

--- Additional comment from Vijay Bellur on 2015-11-14 14:57:34 EST ---

REVIEW: http://review.gluster.org/12581 (cluster/tier make cache mode default
for tiered volumes) posted (#1) for review on master by Dan Lambright
(dlambrig at redhat.com)

--- Additional comment from Vijay Bellur on 2015-11-17 07:18:33 EST ---

COMMIT: http://review.gluster.org/12581 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit dcd1ff344d242f64f3a5c579df97a050736e6633
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Sat Nov 14 14:35:26 2015 -0500

    cluster/tier make cache mode default for tiered volumes

    The default mode for tiered volumes must be cache. The current
    test mode was for engineering and should ordinarily not be used
    by customers.

    Change-Id: I20583f54a9269ce75daade645be18ab8575b0b9b
    BUG: 1282076
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/12581
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: mohammed rafi  kc <rkavunga at redhat.com>


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1282076
[Bug 1282076] cache mode must be the default mode for tiered volumes
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