[Bugs] [Bug 1282076] New: cache mode must be the default mode for tiered volumes

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1282076

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



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.

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