The test objective is to maintain constant safety and security video traffic during select storage failure scenarios, such as disk rebuild and controller failure. During these scenarios, frame loss was observed on the ME4 platform as tier 2 storage. The media loss rate on 4 recorders was calcuated at 0.02 percent, which falls within the acceptable rate of less that 1 percent designated by Milestone.
Dell recommends using ME4 platforms for:
- Small implementations
- Archive storage as a second tier
- Installations that include noncritical cameras where some video frame loss is acceptable during storage recovery activities, such as disk rebuilds and controller outages that are required for maintenance upgrades or failures Note: For mission critical safety and security video applications, Dell recommends Unity, Isilon, or ECS with GeoDrive.
Behavior can vary per video management software product and implementation decisions, such as selected infrastructure hardware, camera setup, and so forth.
The following tests were performed to ensure a worst-case scenario for all sizing parameters:
- Disk drive failures
- Storage controller failures
- NIC failures
We performed all tests using 1.4 Mb/s cameras.
The following table shows details of Archive DB performance with ME4 arrays during lab testing: