Brocade Communications Systems BR-1020 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 95)

Brocade Adapters Troubleshooting Guide 77

53-1001253-01

Chapter

Performance optimization

In this chapter

•Tuning storage drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

•Tuning network drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Tuning storage drivers

This section provides resources for optimizing performance in HBAs and CNAs by tuning the unified

storage drivers on Linux, Windows, Solaris, and VMware systems. To optimize performance for CNA

products, also use resources under “Tuning network drivers” on page 79.

Linux tuning

Linux disk I/O scheduling reorders, delays, and merges requests to achieve better throughput and

lower latency than would happen if all the requests were sent straight to the disk. Linux 2.6 has

four different disk I/O schedulers: noop, deadline, anticipatory and completely fair queuing.

Enabling the “noop” scheduler avoids any delays in queuing of I/O commands. This helps in

achieving higher I/O rates by queuing multiple outstanding I/O requests to each disk.

To enable the noop scheduler, run the following commands on your system.

for i in /sys/block/sd[b-z]/queue/scheduler

echo noop > $i

done

NOTE

You must disable the default scheduler because it is not tuned for achieving the maximum I/O

performance.

For performance tuning on Linux, refer to the following publications:

• Workload Dependent Performance Evaluation of the Linux 2.6 IO Schedulers

Heger, D., Pratt, S., Linux Symposium, Ottawa, Canada, July 2004

• Optimizing Linux Performance

HP Professional Books, ISBN: 0-13-148682-9

• Performance Tuning for Linux Servers

Sandra K. Johnson, Gerrit Huizenga, Badari Pulavarty, IBM Press, ISBN: 013144753X

• Linux Kernel Development

Robert Love, 2nd edition, 2005

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 109 110

Keine Kommentare

Brocade Communications Systems BR-1020 Anleitung zur Fehlerbehebung Seite 95