Raw device for red hat

Question

Hi,
I tried to install raw device on red hat 4.2.I posted the mount point of that machine
]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
145G 9.6G 128G 7% /
/dev/sda1 99M 13M 82M 14% /boot
none 2.0G 0 2.0G 0% /dev/shm
/dev/sdb1 459G 350G 86G 81% */ydev*
is it possible to use /ydev for the RAW mount point *.If it's,is it afffect any existing applications at dev?*
please help me out that

Answer 1

All that is required from a system level are partitioned disks. Oracle will handle the configuration of the filesystem. Here are my steps to configure raw devices using LUNs:
--- PARTITION THE RAW VOLUMES ---
fdisk /dev/<disk>
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-512, default 1):<enter>
Using default value 1
Last cylinder or size or sizeM or +sizeK (1-512, default 512): >
Using default value 512
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
--- BIND PARTITIONS TO RAW DEVICES ---
Edit /etc/udev/rules.d/60-raw.rules and add:
# Define mapping of SCSI hard disks for Oracle Raw Devices
ACTION=="add", KERNEL=="sdg1", RUN+="/bin/raw /dev/raw/raw1 %N"
ACTION=="add", KERNEL=="sdj1", RUN+="/bin/raw /dev/raw/raw2 %N"
ACTION=="add", KERNEL=="sdk1", RUN+="/bin/raw /dev/raw/raw3 %N"
# Define persistent raw device permissions
ACTION=="add", KERNEL=="raw*", OWNER=="oracle", GROUP=="dba", MODE=="0660"
--- CREATE THE RAW DEVICES ---
/sbin/start_udev
--- VERIFY RAW DEVICES ---
raw -qa
2.     Update permissions of new devices
chown -R oracle:dba /dev/<disks>
3.     Create links to device on /dev/oracle
# DETERMINE SCSI LINKS TO DEVICES
clear ; ls -la /dev/disk/by-id/ | grep sd[f-v]1 | awk '{print $11,$9}'| sort
# CREATE VOLUME MEMBER SYMBOLIC LINKS. DONE!