Create Volume operation (part II)-Play with OpenStack (51) 5 minutes a day

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In the previous section we discussed the first part of Cinder creating Volume, Cinder-api operation, this section continues the second part, Cinder-scheduler scheduling work.

cinder-scheduler Execution Scheduling

Cinder-scheduler executes the scheduling algorithm and selects the optimal storage node log for/opt/stack/logs/c-sch.log through Filter and Weigher.

Cinder-scheduler performs the dispatch work through Flow Volume_create_scheduler.

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The Flow executes Extractschedulerspectask and schedulecreatevolumetask in turn.

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The main filter and weighting work is done by Schedulecreatevolumetask.

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After Availabilityzonefilter, Capacityfilter, Capabilitiesfilter and capacityweigher layers of filtering, the storage node was finally selected [email protected]# Lvmdriver-1.

Flow Volume_create_scheduler completes the dispatch and the status changes to SUCCESS.

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Cinder-scheduler sending Messages

Cinder-scheduler send a message to Cinder-volume, let it create volume source/opt/stack/cinder/cinder/scheduler/filter_scheduler.py, method for Schedule_create_volume.

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In the next section we discuss the last part of Create Volume: the cinder-volume process.

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Create Volume operation (part II)-Play with OpenStack (51) 5 minutes a day