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关于Linux、ASM、O_Direct方面的信息,今天又有更正:Oracle RDBMS是10202以上才支持对Linux的BlockDevice使用O_Direct操作,而不是前面说的从10gR2(10201)开始。
相关信息见note 357492.1 Linux 2.6 Kernel Deprecation Of Raw Devices
“……
DEPRECATION OF RAW DEVICES IN LINUX 2.6 KERNELS
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Starting with the 2.6 Linux kernel, raw devices are being phased out in favor of O_DIRECT access directly to the block devices.
With Oracle RDBMS 10.2.0.2 and higher, block devices can be accessed via any of the following methods, and utilized by RDBMS:
- Directly to the block device
- Via ASMLib mapped devices
- OCFS2 devices
- LVM2 mapped devices if single-instance
……”
上面的信息也不见得就是指从10202开始,但这是我目前看到的唯一官方消息,仅作参考。 |
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