[CentOS] Raw device gone after reboot (Centos 5.2)!!!

Jeff jlar310 at gmail.com
Fri Jul 18 14:06:19 UTC 2008

2008/7/18 mcclnx mcc <mcclnx at yahoo.com.tw>:
> Thank you for answer.   CENTOS 5.2 does not have "rawdevices" services and
> also NO "/etc/udev/permissions.d" file any more.

OK, so I'm still on CentOS 4 which has /etc/udev/permissions.d. CentOS
5 has /etc/udev with different subdirectory structure, but I'm sure
you can configure the device owner/group/mode somewhere with udev.
There's probably a man page on that. If you can't figure that out,
just write a script to set the device permissions before the database

The point is that you don't need to do anything special to use raw
devices. In fact, your database software may call them raw devices,
but don't try to translate that to the former use of 'raw' in Linux.
Linux no longer requires any special configuration or services for
advanced databases to access unmounted, unformatted partitions.

You talk about 'mounting' raw devices in another post, but mounting is
the opposite of 'raw'. Raw is by definition unmounted. Just point your
database server at /dev/sd* devices. It will do the rest.

Forget about raw devices. They are history. Just think of it as direct
access to unmounted disk partitions.

> --- 08/7/17 (星期四),Jeff <jlar310 at gmail.com> 寫道:
> 寄件者: Jeff <jlar310 at gmail.com>
> 主旨: Re: [CentOS] Raw device gone after reboot (Centos 5.2)!!!
> 收件者: "CentOS mailing list" <centos at centos.org>
> 日期: 2008 7 17 星期四 下午 5:45
> 2008/7/17 mcclnx mcc <mcclnx at yahoo.com.tw>:
>> We are set up CENTOS 5.2 (X86) as our database server.  I created raw
>> partitions and also put definition on /etc/sysconfig/rawdevices.
>> I can use "raw -qa" see raw partitions.  The wield things is
> after reboot
>> /dev/raw is not exist any more.
>> Does anyone know how to fix it?
> Raw partitions are deprecated. I recall from prior posts that you are
> using Informix, is that right? Recent versions of Informix implement
> the O_DIRECT flag for disk I/O so raw devices are not needed
> For our Informix installation, we point the server directly at the
> /dev/sd* devices. The one trick is to create a file in
> /etc/udev/permissions.d that sets the permissions for the disk devices
> at boot.
> # cat /etc/udev/permissions.d/40-
> informix.permissions
> sdb5:informix:informix:0660
> sdb6:informix:informix:0660
> sdb7:informix:informix:0660
> #


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