What is os-prober
The os-prober package detects all operating systems available on a machine and returns results in a universal machine-readable format.
Sometimes os-prober can cause problems with some special disks (for example, Oracle ASM disks).
This tutorial describes how to disable os-prober.
os-prober is invoked by the grub2-mkconfig command when a new GRUB configuration file is created.
Running grub update on loaded Oracle ASM LUNS results in timeouts on ASM disks.
You will see the following errors in Oracle trace files:
ORA-15080: synchronous I/O operation failed to write block 567864873 of disk 6 in >disk group REDO ORA-27061: waiting for async I/Os failed Linux-x86_64 Error: 1: Operation not permitted
To disable os-prober: 1. The GRUB_DISABLE_OS_PROBER variable in the / etc / default / grub file must be set to true. For example:
# vi /etc/default/grub GRUB_DISABLE_OS_PROBER=true
2. After modifying / etc / default / grub, the GRUB configuration should be restored.
– On BIOS-based systems:
# grub2-mkconfig -o /boot/grub2/grub.cfg
– On UEFI based systems:
# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
From the grub info page on the behavior of the GRUB_DISABLE_OS_PROBER = true parameter:
'GRUB_DISABLE_OS_PROBER' Normally, 'grub-mkconfig' will try to use the external 'os-prober' program, if installed, to discover other operating systems installed on the same system and generate appropriate menu entries for them. Set this option to 'true' to disable this.
The grub2-mkconfig command scans all disks presented to the system when grub.cfg was created. If there are many disks in the system, it may take a while and the system will freeze. Therefore, it is recommended to disable it if you have an oracle database system loaded with a lot of ASM disks.