Using udev with st devices – Dell Emulex Family of Adapters User Manual
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Emulex Drivers Version 10.2 for Linux User Manual
P010081-01A Rev. A
3. Configuration
FC and FCoE Driver Configuration
832
Configuring the System to Boot Using Persistent Names
For SLES 11 SPx
Note: SLES 11 SPx is configured by default with udev to provide persistent names for
hard disks, including FC-attached disks.
To use a persistent name for a boot device with SLES 11 SPx:
1. In /boot/grub/menu.lst, find the kernel line for the default boot. For example:
kernel /boot/vmlinuz root=/dev/sda2 vga=0x314
2. Find the persistent name for the root partition (following “root=” on the kernel line)
by using the instructions in “Using udev to Discover Logical to Physical Mappings
3. In the same file, /boot/grub/menu.lst, replace the text after “root=” with the
partition’s persistent name. For example:
kernel /boot/vmlinuz root=/dev/disk/by-id/scsi-32000000c5005d6e6-part2
vga=0x314
4. Change any mounts listed in /etc/fstab that refer to this root partition by either its
/dev/sd name or a file system label to use the persistent name as well.
For RHEL 5.x and RHEL 6.x
To use a persistent name for a boot device with RHEL 5.x and RHEL 6.x:
1. In /boot/grub/grub.conf, find the kernel line for the default boot. For example:
kernel /boot/vmlinuz -
2. Find the persistent name for the root partition (following “root=” on the kernel line)
by using the instructions in “Using udev to Discover Logical to Physical Mappings
3. In the same file, /boot/grub/menu.lst, replace the text after “root=” with the
partition's persistent name. For example:
kernel /boot/vmlinuz -
root=/dev/disk/by-id/scsi-32000000c5005d6e6-part2
4. Change any mounts listed in /etc/fstab which refer to this root partition by either
its /dev/sd name or a file system label to use the persistent name as well.
Using udev with st Devices
In Linux, the driver for SCSI tape drives is “st”. A tape device name has an “st” prefix.
The udev rules for tape devices are the same as for disk devices. There must be a
unique ID that persists across initiator reboots and persists regardless of discovery
order.
You must consider whether the tape device is an FC tape device or an FC-SCSI tape
device (in which there are multiple SCSI tape devices that reside behind an FC
controller). If it is an FC tape device, then the WWPN is unique and can be used to
create the persistent name. In this case, the scsi_id command should return this as the
unique identifier with a single digit prefix. If the FC controller has multiple SCSI tape
devices behind it, the WWPN is not unique, and the persistent name must use multiple