vPool wizard: loading backends load

[JeffreyDevloo]

Problem description

It takes a while to (re)load the backend information in the vpool wizard. This is mainly due to the local_stack query that happens on the API to get the necessary information.

Possible solution

Cache the local_stack information for every node in the cluster so it doesn't need to be fetched for each backend.

Additional information

Setup

Hyperconverged setup

• Three nodes with each three disks for the back-end
• 25 backends
• 50 disks initialized with one ASD for each disk
• 2 ASD for each backend
• Preset (1,1,1,1)

  Package information

• openvstorage 2.7.2-rev.3859.42b3488-1 amd64 openvStorage
• openvstorage-backend 1.7.2-rev.675.37ca5b8-1 amd64 openvStorage Backend plugin
• openvstorage-backend-core 1.7.2-rev.675.37ca5b8-1 amd64 openvStorage Backend plugin core
• openvstorage-backend-webapps 1.7.2-rev.675.37ca5b8-1 amd64 openvStorage Backend plugin Web Applications
• openvstorage-cinder-plugin 1.2.2-rev.32.948a8c1-1 amd64 OpenvStorage Cinder plugin for OpenStack
• openvstorage-core 2.7.2-rev.3859.42b3488-1 amd64 openvStorage core
• openvstorage-hc 1.7.2-rev.675.37ca5b8-1 amd64 openvStorage Backend plugin HyperConverged
• openvstorage-health-check 2.0.0-rev.117.3212ea9-1 amd64 Open vStorage HealthCheck
• openvstorage-sdm 1.6.2-rev.330.f06c8de-1 amd64 Open vStorage Backend ASD Manager
• openvstorage-test 2.7.2-rev.980.0dbc80f-1 amd64 openvStorage autotest suite
• openvstorage-webapps 2.7.2-rev.3859.42b3488-1 amd64 openvStorage Web Applications

[khenderick]

The local_stack contains slightly different information per backend. However, parts of the data uses can be cached/shared across backends/nodes which should speed up these calls.

[khenderick]

Fixed by openvstorage/framework-alba-plugin#235, packaged in openvstorage-backend-1.7.4-rev.743.af3422d