Configuring Device Persistence Manually for Oracle ASM

Complete these tasks to create device path persistence manually for Oracle ASM.

On existing systems (single instance or clustered), to obtain current mount paths, run the command scsi_id (/sbin/scsi_id) on storage devices on a server to obtain their unique device identifiers. When you run the command scsi_id with the -s argument, the device path and name you provide should be relative to the sysfs directory /sys (for example, /block/device) when referring to /sys/block/device.

For example, as the root user:
```
# /sbin/scsi_id -g -s /block/sdb/sdb1
360a98000686f6959684a453333524174
 
# /sbin/scsi_id -g -s /block/sde/sde1
360a98000686f6959684a453333524179
```
Record the unique SCSI identifiers, so you can provide them when required.

Note:

The command scsi_id should return the same device identifier value for a given device, regardless of which node the command is run from.
Configure SCSI devices as trusted devices, by editing the /etc/scsi_id.config file and adding options=-g to the file.
```
# cat > /etc/scsi_id.config
vendor="ATA",options=-p 0x80
options=-g
```
Using a text editor, create a UDEV rules file for the Oracle ASM devices, setting permissions to 0660 for the installation owner and the operating system group you have designated the OSASM group, whose members are administrators of the Oracle Grid Infrastructure software. For example, on Oracle Linux, to create a role-based configuration rules.d file where the installation owner is grid and the OSASM group asmadmin, enter commands similar to the following:
```
# vi /etc/udev/rules.d/99-oracle-asmdevices.rules
 
KERNEL=="sdb1, OWNER="grid", GROUP="asmadmin", MODE="0660", 
BUS=="scsi", PROGRAM=="/sbin/scsi_id", RESULT=="14f70656e66696c00000000"
KERNEL=="sdc1", OWNER="grid", GROUP="asmadmin", MODE="0660",
BUS=="scsi", PROGRAM=="/sbin/scsi_id", RESULT=="14f70656e66696c00000001"
KERNEL=="sdd1", OWNER="grid", GROUP="asmadmin", MODE="0660",
BUS=="scsi", PROGRAM=="/sbin/scsi_id", RESULT=="14f70656e66696c00000002"
```
On clustered systems, copy the rules.d file to all other nodes on the cluster. For example:
```
# scp 99-oracle-asmdevices.rules root@node2:/etc/udev/rules.d/99-oracle-asmdevices.rules
```
Run the partprobe command using the syntax /sbin/partprobe devicename.
For example:
```
# /sbin/partprobe /dev/sdc1
# /sbin/partprobe /dev/sdd1
# /sbin/partprobe /dev/sde1
# /sbin/partprobe /dev/sdf1
```

Run the command udevtest (/sbin/udevtest) to test the UDEV rules configuration you have created. The output should indicate that the devices are available and the rules are applied as expected. For example, for /dev/ssd1:

# udevtest /block/sdd/sdd1
main: looking at device '/block/sdd/sdd1' from subsystem 'block'
udev_rules_get_name: add symlink
'disk/by-id/scsi-360a98000686f6959684a453333524174-part1'
udev_rules_get_name: add symlink
'disk/by-path/ip-192.168.1.1:3260-iscsi-iqn.1992-08.com.netapp:sn.887085-part1'
udev_node_mknod: preserve file '/dev/.tmp-8-17', because it has correct dev_t
run_program: '/lib/udev/vol_id --export /dev/.tmp-8-17'
run_program: '/lib/udev/vol_id' returned with status 4
run_program: '/sbin/scsi_id'
run_program: '/sbin/scsi_id' (stdout) '360a98000686f6959684a453333524174'
run_program: '/sbin/scsi_id' returned with status 0
udev_rules_get_name: rule applied, 'sdd1' becomes 'data1'
udev_device_event: device '/block/sdd/sdd1' validate currently present symlinks
udev_node_add: creating device node '/dev/data1', major = '8', minor = '17', 
mode = '0640', uid = '0', gid = '500'
udev_node_add: creating symlink
'/dev/disk/by-id/scsi-360a98000686f6959684a453333524174-part1' to '../../data1'
udev_node_add: creating symlink
'/dev/disk/by-path/ip-192.168.1.1:3260-iscsi-iqn.1992-08.com.netapp:sn.84187085
-part1' to '../../data1'
main: run: 'socket:/org/kernel/udev/monitor'
main: run: '/lib/udev/udev_run_devd'
main: run: 'socket:/org/freedesktop/hal/udev_event'
main: run: '/sbin/pam_console_apply /dev/data1
/dev/disk/by-id/scsi-360a98000686f6959684a453333524174-part1
/dev/disk/by-path/ip-192.168.1.1:3260-iscsi-iqn.1992-08.com.netapp:sn.84187085-
part1'

In the example output, note that applying the rules renames OCR device /dev/sdd1 to /dev/data1.

Load the rules and restart the UDEV service. For example:
- Oracle Linux and Red Hat Enterprise Linux
```
# udevadm control --reload-rules
```
- SUSE Linux Enterprise Server
```
# /etc/init.d boot.udev restart
```

Verify that the device permissions and ownerships are set correctly.

Parent topic: Configuring Storage Device Path Persistence Manually