Brocade Communications Systems BR-1020 Guía para resolver problemas descargar pdf (Pagina 96)

78 Brocade Adapters Troubleshooting Guide

53-1001253-01

Tuning storage drivers

Solaris tuning

To increase I/O transfer performance, set the following parameters on your system:

• Set the maximum device read/write directive (maxphy).

• Set the disk maximum transfer parameter (ssd_max_xfer_size).

Please refer to Sun StorageTek SAM File System Configuration and Administration Guide document

for details of the two parameters.”

Windows tuning

Windows tuning involves configuring the driver and operating system tunable parameters.

Driver tunable parameters

You can manipulate several driver parameters to increase performance.

bfa_lun_queue_depth (outstanding I/O requests per LUN)

The driver uses a default LUN queue depth value of 32. This value is chosen to reflect the average

operating I/O load in most scenarios. Storport manages the I/O throttling at the per-LUN level to

guarantee the configured queue depth. During performance testing with specific high-end array

LUNs, it may be necessary to increase this I/O queue depth to a much larger value. Microsoft

recommends a value of 96 during high-performance testing scenarios. If the queue depth is not

sufficient, then you will notice performance degradation.

The queue depth can be configured at the following registry location with any value within the

range 1 – 254.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\bfad\Parameters\Device\bfa_lun_

queue_depth

Interrupt moderation using interrupt coalescing feature

Moderating interrupts can often result in reduced CPU load on the host but, unless interrupt

moderation is performed intelligently, the CPU savings might increase latency.

The default values for the Fibre Channel port interrupt attributes are configured as follows:

• Interrupt delay

Default: 1 microsecond

Valid Range: 0 – 1125 microseconds (Note that the value of 0 disables the delay timeout

interrupt.)

• Interrupt latency

Default: 1 micro second

Valid Range: 0 – 225 micro \seconds (Note that the value of 0 disables the latency monitor

timeout interrupt.)

Message signaled interrupts (MSI-X)

All Brocade adapters support MSI-X, an eXtended version of the MSI defined in PCI 3.0

specification. MSI-X helps improve overall system performance by contributing to lower interrupt

latency and improved host CPU utilization.

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 109 110

Sin comentarios

Brocade Communications Systems BR-1020 Guía para resolver problemas Pagina 96