请教一个Linux裸设备的权限问题

loveibm

我在RedHat AS4下做Oracle RAC，打算把OCR和voting信息放在裸设备上。创建分区后，又指定了裸设备，还为裸设备指定了权限。当系统重新启动后，发现裸设备的权限又改成最初的样子了，请教高手，这个问题怎么解决？
看了一些文档，介绍说在目录/etc/udev/permissions.d下创建一个文件，在这个文件中指定裸设备的权限即可。请教大家，这个文件的名称和格式应该是什么样子的？
谢谢！

wolfop

那个改起来颇麻烦，不如直接写rc.local算了。不过如果要开机放在rc*.d中启动ORACLE，还是要给permissions.d

blue_stone

Oracle Clusterware fails to start after a reboot due to permissions on raw devices reverting to default values, How to fix?
After a successful installation of Oracle Clusterware a simple reboot and the Clusterware fails to start. This is because the permissions on the raw devices for the OCR and voting disks e.g. /dev/raw/raw{x} revert to their default values (root:disk) and are inaccessible to Oracle. This change of behavor started with the 2.6 kernel; in RHEL4, OEL4, RHEL5, OEL5, SLES9 and SLES10. In RHEL3 the raw devices maintained their permissions across reboots so this symptom was not seen.



The way to fix this is on RHEL4, OEL4 and SLES9 is to create /etc/udev/permission.d/40-udev.permissions (you must choose a number that's lower than 50). You can do this by copying /etc/udev/permission.d/50-udev.permissions, and removing the lines that are not needed (50-udev.permissions gets replaced with upgrades so you do not want to edit it directly, also a typo in the 50-udev.permissions can render the system non-usable). Example permissions file:
# raw devices
raw/raw[1-2]:root:oinstall:0640
raw/raw[3-5]:oracle:oinstall:0660

Note that this applied to all raw device files, here just the voting and OCR devices were specified.



On RHEL5, OEL5 and SLES10 a different file is used /etc/udev/rules.d/99-raw.rules, notice that now the number must be (any number) higher than 50. Also the syntax of the rules is different than the permissions file, here's an example:

KERNEL=="raw[1-2]*", GROUP="oinstall", MODE="640"
KERNEL=="raw[3-5]*", OWNER="oracle", GROUP="oinstall", MODE="660"

This is explained in details in Note: 414897.1.

loveibm

楼上两位介绍的方法我都试过了，都可行。多谢了！

wolfop

顺便说一下，在10.2.0.2以后，不需要用/dev/raw了，直接用/dev/sdxx后者/dev/XXVG/xxlv
将来在LINUX下面，raw会被废除。