sf6.0.1在rhel6上的io性能问题-优快云博客

本文介绍了一个已知的问题：在升级到Symantec Storage Foundation 6.0.1版本后，使用dd命令写入整个测试设备的长度在Red Hat Enterprise Linux 6上的速度显著降低。提供了外部链接以获取更多关于如何解决此问题的信息。

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I/O performance reduced on RHEL 6 with Symantec Storage Foundation SF 6.0.1

环境

RHEL 6
Symantec Storage Foundation 6.0.1.

问题

Using dd to write to the entire length of a test device is significantly slower on Red Hat Enterprise Linux (RHEL) 6, when upgrading to Symantec Storage Foundation version 6.0.1.

决议

This is a known issue detailed in the following Symantec knowledge-base article. Please contact Symantec directly for up-to-date recommendation on how to remedy this issue. Please note, the following link is external to Red Hat and as such, we cannot validate its contents:

http://www.symantec.com/business/support/index?page=content&id=TECH209004
Performance degradation observed when running Storage Foundation 6.0.x on RHEL 6.x

诊断步骤

It is possible to test I/O performance to Veritas disk groups by writing to the length of a device through something similar to the following dd command. It is necessary to include oflag=direct so that data is written directly to the disk in order to avoid results being skewed through the use of caching:

dd if=/dev/zero of=/dev/vx/<etc> bs=64k count=<length_of_disk_in_blocks> oflag=direct

NOTE: Please run this command on test devices only as this will overwrite the contents of the target device.