Problem
Unable to launch Rescue screen when booting System Recovery Disk (SRD) from DVD drive other than /dev/sr0. For details, please see Error Message section.
Error Message
Couldn't mount /dev/sr0. No suitable images. No medium found on /dev/sr0.
/dev/root does not exists.
Figure 1
Cause
The first DVD drive (/dev/sr0) is always specified as DVD device in the SRD.
However, your DVD drive is not /dev/sr0 but /dev/sr2 or /dev/sdc1.
Solution
Workaround:
1. Run the below command on "dracut:/#" shell.
# blkid
2. Find CDROM and the device name.
3. Shut down and boot from the SRD.
4. Rescue screen appears.
In case of Red Hat 7.x, see Figure 2a.
In case of Red Hat 8.x, see Figure 2b.
Figure 2a Red Hat 7.x
Figure 2b Red Hat 8.x
5. Select edit mode.
In case of Red Hat 7.x press [Tab].
In case of Red Hat 8.x press 'e'.
Figure 3a Red Hat 7.x
Figure 3b Red Hat 8.x
6. Change the value from /dev/sr0 to /dev/sr2 or /dev/sdc1. (See Figure 4a and 4b)
Figure 4 Red Hat 7.x
Figure 4b Red Hat 8.x
4. In case of Red Hat 7.x, press [Enter] key. In case of Red Hat 8.x, press [CTRL]+ x.
Product version
Veritas System Recovery 18 or later
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Please note that this document is a translation from English, and may have been machine-translated. It is possible that updates have been made to the original version after this document was translated and published. Veritas does not guarantee the accuracy regarding the completeness of the translation. You may also refer to the English Version of this knowledge base article for up-to-date information.