How to create an OBP boot device alias in Solaris [SPARC]
These aliases are created to simplify access to hardware devices at the OBP level. They can be used in place of the full OBP hardware path at the “ok” prompt. When viewed via the “devalias” command at the prom level, they are listed in the form of the alias name followed by the full hardware path to the device. There are 3 methods discussed in this post to create a boot device alias.
Method 1: Creating a custom boot device alias using show-disks and nvalias from the OpenBoot PROM (OBP) command line
While still booted to the Solaris Operating Environment, find the device path for the boot disk:
# df -lh / # ls -l /dev/dsk/cxtxdxsx
Example
# df -lh / Filesystem size used avail capacity Mounted on /dev/dsk/c0t0d0s0 12G 5.1G 6.3G 45% /
# ls -l /dev/dsk/c0t0d0s0 lrwxrwxrwx 1 root root 41 Feb 1 2010 /dev/dsk/c0t0d0s0 -> ../../devices/pci@1f,4000/scsi@3/sd@0,0:a
Write down the entire physical path to be used for the alias.
Gracefully shutdown the system to the ok prompt:
# init 0
At the ok> prompt, use the show-disks command to view the available disks on the system and select the boot-device path that you wrote down in the first step. Note that the OBP translates the ‘sd’ part of the device path to ‘disk’.
ok> show-disks a) /ramdisk-root b) /pci@1f,4000/scsi@3,1/disk c) /pci@1f,4000/scsi@3/disk <-- been="" c="" command="" control-y="" creating="" d="" devalias="" disk="" e.g.="" ebus="" enter="" f0="" f="" fdthree="" follow="" for="" has="" in="" insert="" is="" it="" line.="" mydev="" no="" nvalias="" ok="" path="" pci="" q="" quit:="" same="" scsi="" selected.="" selection="" steps="" the="" these="" this="" to="" type=""> nvalias newdisk /pci@1f,4000/scsi@3/disk@0,0:a <-- a="" add="" manually="" pre="" the="">
Follow the prompts to use nvalias to create the new device alias and add the disk number and slice number from the device path (which you wrote down in the first step) to the end of the device path. e.g. In the example above, @0,0:a was added to the end of the path. Set the boot-device to the new device alias:
ok> setenv boot-device [alias-name] ok> printenv boot-device ok> reset-all
Example
ok> setenv boot-device newdisk ok> printenv boot-device boot-device = newdisk ok> reset-all
Note: Custom device aliases will be retained in the OBP unless set-defaults (STOP-N) is used to reset the NVRAM to the default values or nvunalias is used to delete the custom device alias. To remove a custom device alias:
ok> nvunalias [aliasname] ok> reset-all
Example
ok> nvunalias mydisk ok> reset-all
Method 2: Creating a boot alias using nvedit
Use the NVRAM editor (nvedit) to create a script that will create the boot alias at reset:
ok> nvedit 0: devalias newdisk /pci@1d,700000/scsi@4/sd@0,0:a ^c (control c) ok nvstore ok setenv use-nvramrc? true ok reset
Set the boot-device to the new device alias:
ok> setenv boot-device [alias-name] ok> printenv boot-device ok> reset-all
Example
ok> setenv boot-device newdisk ok> printenv boot-device boot-device = newdisk ok> reset-all
Method 3: Viewing and using existing device aliases provided in the OpenBoot PROM
Use the devalias command to identify the default device aliases:
ok> devalias disk5 /pci@1f,4000/scsi@3/disk@c,0 disk4 /pci@1f,4000/scsi@3/disk@b,0 disk3 /pci@1f,4000/scsi@3/disk@a,0 disk2 /pci@1f,4000/scsi@3/disk@9,0 disk1 /pci@1f,4000/scsi@3/disk@8,0 disk0 /pci@1f,4000/scsi@3/disk@0,0 <--- alias="" disk0="" disk="" f="" is="" path="" pci="" pre="" same="" scsi="" the="">
Identify the boot disk path in the above output and set the boot-device to that alias:
ok> setenv boot-device [alias-name] ok> printenv boot-device ok> reset-all
Example
ok> setenv boot-device disk0 ok> printenv boot-device boot-device = disk0 ok> reset-all
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