9.30 Oracle VM Server Boot Delay and I/O Error Messages with Oracle ZFS Storage Array

A known issue with the Oracle ZFS SCSI storage driver causes significant delays during Oracle VM Server boot and writes a large number of I/O error messages to the kernel log. This issue occurs because the storage driver loads before the SCSI device handler modules (scsi_dh) are available. As a result, the system issues I/O operations to SCSI multipath devices before the devices can handle them.

Workaround: Add the SCSI device handler modules (scsi_dh) to the kernel command line parameters as follows:

Open /etc/default/grub for editing.
Add rdloaddriver=scsi_dh_alua to the GRUB_CMDLINE_LINUX line.

Regenerate the GRUB2 configuration.

BIOS-based systems:
```
grub2-mkconfig -o /boot/grub2/grub.cfg
```

UEFI-based systems:

grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

Bug 25686610