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?
?
Thanks.
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mcclnx mcc wrote:> 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?Are you sure you want to do that? from the raw manpage: WARNING Although Linux includes support for rawio, it is now a deprecated interface. If your application performs device access using this interface, Red Hat encourages you to modify your application to open the block device with the O_DIRECT flag. The rawio interface will exist for the life of Red Hat Enterprise Linux 4, but is a candidate for removal from future releases. What database server are you using that your wanting to use raw for? My only experience with raw devices and databases is with Oracle 10G and Automatic Storage Management(ASM). In that case Oracle's stuff handles all of the direct I/O without needing anything to do with /dev/raw, infact I've explicitly disabled the raw service on all of my servers because I've never needed it. nate
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 # -- Jeff