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- Sequential :- In CloudStack Resource Layer end point(host) is selected based on rand() function. selected host will perform/process copy command operation for volume creation. Behavior is sequential if the rand() function selects same host for every concurrent volume from snapshot create request. Since there is only one host which needs be handle multiple requests. So Host will copy the snapshot content to volume(s) one after one in sequential manner.
- Parallel :- Behavior is Parallel if the rand() function selects different host for every concurrent every concurrent volume from snapshot create requestcreate request. Host will copy the snapshot content to volume in parallel execution
Note : however there are limitations in the existing functionality due to rand() function has problem in handling multiple hosts. It needs to be addressed may be in next version releases.
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API Changes
No changes
DB Changes
N/A
insert/delete a row in table VOLUME_DETAILS table. which holds information of volume and snapshot for create volume from snapshot request
Hypervisors supported
Applicable to XenServer,KVM,VMware
TODO :- Yet to Updated for other hypervisors
UI Changes
No changes
Upgrade
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