The test results are based on a model in which the constant-bandwidth safety and security video traffic remained unaffected during a single node maintenance cycle, disk rebuild, or node failure.
To maximize performance for safety and security workloads, the Dell Technologies Safety & Security Lab recommends the following best practices:
- Use two SSD system drives per node in clusters where it is supported
- Cluster utilization not to exceed 70 percent capacity
Sizing guidelines are based on a combination of storage capacity and per node bandwidth. When sizing a cluster, make sure to evaluate the number of servers that write and read from nodes in addition to overall storage capacity.
We used 10 GbE interfaces with no more than two SMB connections per interface. A 10 GbE interface can accommodate up to four connections at the maximum -supported values.
We performed all tests with a per-camera bandwidth of 4 Mb/s, so a single that handles 37.5 MB/s can support 75 such cameras.
We performed all tests with node or drive failures in the cluster (for example, with FlexProtect running) to ensure a worst-case scenario for all sizing parameters.
The following table provides bandwidth-sizing guidelines based on our test results.
Cluster | version | OneFS version | Archivers per node | Bandwidth MB/s (Mb/s) | Drive size | |
Per Archiver | Per node | |||||
A2000 (64 GB) | 5.9 | 8.2.2 | 2 | 35 (280) | 70 (560) | 10 TB |
A2000 (16 GB) | 5.8 | 8.2.2 | 1 | 37.5 (300) | 37.5 (300) | 10 TB |
2 | 25 (200) | 50 (400) | 10 TB |