Set fragment size to 16MB by default instead of 1MB

[wimpers]

Set fragment size to 16MB by default instead of 1MB.

[khenderick]

Fixed by #242, packaged in openvstorage-backend-1.7.4-rev.764.b87b3c9

[JeffreyDevloo]

Steps

• Setup cluster
• Added roles to disks
• Added backend
• Added a new preset
• Verified the fragment size

Code to verify:

from ovs.dal.lists.albabackendlist import AlbaBackendList

faulted_backends = {}
expected_value = 16 * 1024 ** 2

for albabackend in AlbaBackendList.get_albabackends():
    for preset in albabackend.presets:

        if preset['fragment_size'] != expected_value:
            faulted_backends[albabackend.name] = {preset['name']:preset['fragment_size']}
        else:
            print 'Fragment size is right for preset {0} and albabackend {1}'.format(preset['name'], albabackend.name)

if len(faulted_backends.keys()) > 0:
    raise ValueError('Fragment sizes are not 16MB by default for presets {0} on backends {1}'.format(''.join(str(faulted_backends.values())), ''.join(faulted_backends.keys())))

Output

Fragment size is right for preset testpreset and albabackend mybackend
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-3-116d80034f59> in <module>()
     13 
     14 if len(faulted_backends.keys()) > 0:
---> 15     raise ValueError('Fragment sizes are not 16MB by default for presets {0} on backends {1}'.format(''.join(str(faulted_backends.values())), ''.join(faulted_backends.keys())))

ValueError: Fragment sizes are not 16MB by default for presets [{'default': 1048576}] on backends mybackend

The fragmentsize for the default preset is still 1MB

Test result

Test failed.

Packages

• openvstorage 2.7.4-rev.4161.5f26491-1 amd64 openvStorage
• openvstorage-backend 1.7.4-rev.770.ae31d34-1 amd64 openvStorage Backend plugin
• openvstorage-backend-core 1.7.4-rev.770.ae31d34-1 amd64 openvStorage Backend plugin core
• openvstorage-backend-webapps 1.7.4-rev.770.ae31d34-1 amd64 openvStorage Backend plugin Web Applications
• openvstorage-cinder-plugin 1.2.2-rev.38.dcc3b76-1 amd64 OpenvStorage Cinder plugin for OpenStack
• openvstorage-core 2.7.4-rev.4161.5f26491-1 amd64 openvStorage core
• openvstorage-hc 1.7.4-rev.770.ae31d34-1 amd64 openvStorage Backend plugin HyperConverged
• openvstorage-sdm 1.6.4-rev.390.89e2ad4-1 amd64 Open vStorage Backend ASD Manager
• openvstorage-webapps 2.7.4-rev.4161.5f26491-1 amd64 openvStorage Web Applications

[JeffreyDevloo]

Information

The framework code works as intended. The reason why the test initially failed was due to the default preset shipped by Alba therefore this issue has been resolved. Opened a ticket on their side https://github.com/openvstorage/alba/issues/410.

Test result

Test passed.

[wimpers]

The decision was to have the framework set the default of 16MB when creating the backend. The ALBA default did not have to be updated.