The test results are based on a model in which the constant-bandwidth video traffic remained unaffected during select storage failure scenarios, such as disk rebuild, failing processors, and failing network paths.
We used 10 GbE interfaces with Master Recorder configured on physical R730 and R630 servers with the connection set at the maximum bandwidth supported. A combination of 4 Mb/s and 8Mb/s cameras were used with motion detection enabled.
We performed all tests with disk drive rebuild and replacement, to ensure a worst-case scenario for all sizing parameters.
With local storage, we recommend using RAID 6 to accommodate the disk rebuild duration. For example, in the Dell Technologies Safety & Security Lab , a disk rebuild in a 16 x 10 TB disk system takes at least 1.5 weeks to complete when 40 TB of data and 125 MB/s of write are in place.
The following table provides bandwidth-sizing guidelines based on our test results.
Specification | R630 | R730xd | R740xd-2 | ||
Enterprise VMS Version | 6.4.3.2811 | 6.4.3.2811 | 7.5.1.7623 | ||
CPU | 2 X 18 Intel Xeon E5-2695 v4 @ 2.1 GHz | 2 X 12 Intel Xeon E5-2650 v4 @ 2.2 GHz | 2 X 12 Intel Xeon E5-2650 v4 @ 2.2 GHz | 2 X 12 Intel Xeon E5-2650 v4 @ 2.2 GHz | 2 X 14 Cores Intel(R) Xeon(R) Gold 5120 CPU @ 2.20GHz |
RAM GB | 256 | 256 | 256 | 256 | 256 |
Drive type | NL-SAS | NL-SAS | NL-SAS | NL-SAS | NL-SAS |
Storage Controller | S130 (SW RAID) | H730P | H730P | H730P | H730P |
No of drives X Drive size TB | 5 X 1 TB | 16 X 10 TB | 16 X 4 TB | 8 X 4 TB | 26 X 8 TB |
RAID | 5 (4+1) | 6 (6+2) | 6 (13+2) | 6 (13+2) | 6 |
HotSpare | 1 | 1 | 1 | 1 | 1 |
Total Write BW per server (MBps) | 75 | 125 | 125 | 80 | 104 |
Total IOPS | — | — | 898 | 536 | 793 |
Disk Rebuild duration | 4 hrs | 1.5 wks | 35 hrs | 33 hrs | 12 days |
Video Data storage | Local | Local | Local | Local | Local |
Nic speed | 2X10 Gb | 2X10 Gb | 2X10 Gb | 2X10 Gb | 2X10 Gb |