Performance improvement of OceanStor V3 where 12 Gbit/s SAS disks are supported but 6 Gbit/s SAS disks are also present

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The rate negotiated between the expander and the 6 Gbit/s SAS disk is 6 Gbit/s. The single disk channel rate is 6 Gbit/s, which is sufficient to requirements. However, the rate negotiated between the expander and the initiator is increased to 12 Gbit/s, which is the shared rate of expanded disks. Therefore, the overall back-end bandwidth is improved.

Other related questions:
12 Gbit/s SAS expansion module
12 Gbit/s SAS expansion modules are described as follows: A 12 Gbit/s SAS interface module provides four 4 x 12 Gbit/s mini SAS HD expansion ports that provide connectivity to disk enclosures. The SAS expansion module connects to the back-end disk array through mini SAS HD cables. If the transfer rate of the device connected to the expansion port is lower than the rate of the expansion port, the expansion port will automatically adapt to the transfer rate to ensure the connectivity of the data transfer channel and consistency of the data transfer rate.

Indicators on a 12 Gbit/s SAS expansion module
Indicators on a 12 Gbit/s SAS expansion modules are described as follows: Power indicator/Hot swap button Steady green: The interface module is working correctly. Blinking green: The interface module receives a hot swap request. Steady red: The interface module is faulty. Off: The interface module is powered off or is hot-swappable. Mini SAS HD expansion port indicator Steady blue: Data is transferred to the disk enclosure at the rate of 4 x 12 Gbit/s. Steady green: Data is transferred to the disk enclosure at the rate of 4 x 3 Gbit/s or 4 x 6 Gbit/s. Steady red: The port is faulty. Off: The link to the port is down.

Dorado5000 V3 (SAS) disk specifications
V3 series Dorado5000 V3 (SAS) supports a maximum of 100 disks. V3 series Dorado supports the following disk types: SAS SSD (applicable to Dorado6000 V3 and Dorado5000 V3 SAS), and NVMe SSD (applicable to Dorado5000 V3 NVMe). SAS SSD: 2.5-inch, 0.25 kg, 600 GB/900 GB/1.8 TB/3.6 TB. NVMe SSD: 2.5-inch, 0.25 kg, 1 TB/2 TB/4 TB. The specifications vary with product versions. For the latest specifications, see: Product Specifications.

Maximum number of disk enclosures that can be connected to a pair of SAS ports
A maximum of eight SAS common disk enclosures can be connected to a pair of SAS ports. High-density disk enclosures require two pairs of SAS ports, which support a maximum of eight high-density disk enclosures. Common and high-density disk enclosures cannot be connected to the same SAS loop.

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