connections requires one of the following solutions:
3.1.2 Host Bus Adapter
You can modify some HBA settings to increase performance. For information specific to your HBA, consult the HBA documentation. Note that many settings are intended to increase the performance of slow storage devices and will not be applicable to RamSans. It is always advisable to check the frame size. The amount of overhead for each Fibre Channel frame is fixed, so larger frames have lower overhead. Set the frame size to the maximum setting, generally 2048 bytes.
3.1.3 PCI Bus
High bandwidth HBA traffic can quickly inundate slower PCI buses. Once a PCI bus reaches its limit, you can do very little to improve performance. Many servers, however, provide different PCI buses with different speeds, and placing the HBA on a different PCI bus can improve performance. TMS recommends giving each
3.1.4 CPU
At a certain point, CPU performance can limit data transfer rates. Determine whether the server’s CPU resources are the limiting factor in performance while benchmarking the
There are a few ways to decrease CPU usage without increasing CPU resources. Certain data usage patterns can be very CPU intensive and fully utilize the CPU. These usually involve small transfer sizes. When possible, increasing the average transfer size decreases CPU usage and offers better performance. Another way to decrease CPU usage is by enabling interrupt coalescing. Interrupt coalescing is an HBA dependent feature that offers a method to trade latency for CPU usage. This feature delays calling the HBA transfer interrupt until several transfers are ready. In general, TMS does not recommend enabling Interrupt Coalescing, because most RamSan applications benefit from low latency. For more information, consult your HBA documentation.
3.2 Connecting the Fibre Channel Ports
Connect the Fibre Channel ports on the
9 of 48 |
