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 1 storage.
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
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 5 Mb/s cameras. We performed a data progression test with a disk ratio of 1:3 (1SSD:3 NL-SAS). In this case, the data is initially written to an SSD disk-based performance tier and is then de-staged to a lower performance tier or archive tier that uses NL-SAS disks.
The following table provides bandwidth-sizing guidelines based on our test results:
Array | DVM Version | RAID | Disks | Bandwidth MB/s (Mb/s) | No. of recorders | ||
No. | Size | Per Recorder | Array iSCSI | ||||
ME4012 1 | 700 | 6 | 12 SSD | 480 GB | 30 (240) | 180 (1440) | 6 |
36 NL-SAS | 12 TB |
Configuration details
Component | Description |
Server Model | Dell PowerEdge R740xd |
Hypervisor version | ESXi 7.0 |
Processor Model | Intel(R) Xeon(R) Gold 62126 CPU @ 2.60GHz |
Number of Processors | 2 |
Cores per socket | 12 |
Memory | 192 GB |
Component | Description |
Storage | Unity 500 |
Firmware | GT280R008-01 |
Disk Type | NLSAS |
Disk Pools | 2 |
Disk count per Pool | 24 |
Disk capacity | 11.8 TB |
RAID | Adapt |
Protocol | iSCSI |
LUN capacity | 24 TB |
Component | Description |
Guest OS | Windows Server 2016 Standard |
vCPU | 4 vCPU |
Memory | 8 GB |
NIC type | VMXNET3 |
Video disk size | 24 TB |
Video Disk block size | 64K |
Component | Description |
Camera Type | Virtual Camera |
Codec | H.264 |
Bitrate | 5 mbps |
FPS | 25 |
Resolution | 720p |