LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Virtualization and Cloud
User Name
Password
Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

Notices


Reply
  Search this Thread
Old 10-10-2021, 10:18 PM   #1
fawaz25
Member
 
Registered: Oct 2018
Posts: 36

Rep: Reputation: Disabled
Server not booting - Operating System not found on start up screen


Hello Linux/VMWare community,

I am facing issues after rebooting one of my RedHat Linux7 server in VMWare VSphere 7 environment.

Server is not booting up after rebooting the server. It is unable to boot from disk. It says Operating System not found.. it is unable to find the disk to boot from ..

The VM is a backup VM which is used to take backups of other VMs and also used to restore the VMs from backup. I see that there are multiple disks of different VMs (that were being backed up) attached to this VM. Some of them are still attached to this VM. Some of the virtual hard disks are of bus type SATA while others are SCSI bus type. And the server was rebooted after verifying no active backup job being run on the VM. After reboot, server is not booting up..

I checked the VM options, went into BIOS and selected Hard disk to be at the top of the boot order and tried to check the hard disk sequence to boot from.. But I am unable to find SCSI0:0 disk in the list of hard disks inside BIOS that holds my Operating system. On the screen to change boot priority, I can just see hard disks with bustype SATA maximizing the Hard disk options. I am unable to see any disks with bus type SCSI in that menu.. so I am unable to force the VM to boot from specific hard disk that has my OS. or atleast put my hard disk which has OS to be at the top in Hard disk priority.

Do you have any suggestions? Any suggestions would be highlights appreciated.
 
Old 10-10-2021, 10:26 PM   #2
rkelsen
Senior Member
 
Registered: Sep 2004
Distribution: slackware
Posts: 3,115
Blog Entries: 4

Rep: Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351Reputation: 1351
Two things come to my mind:

1. The SCSI controller. If this VM has recently been updated, does it have support for the correct SCSI controller? The LSI Logic SAS is the "safe" one to choose in VMware, and it should work with most distros. You can switch it back to PV-SCSI after you're sure that the driver is loaded.

2. EFI support. RHEL 7 should *I think* have support for EFI, but perhaps it wasn't switched on at the time you ran the installation. Subsequently switching it on will cause the error you're seeing. And vice versa: If it was on at installation, subsequently switching it off will also cause this type of error.

Failing either of those two, you could try booting the VM with a live CD iso, and poke around to see what's wrong... eg: why it isn't finding the disk, which controller it expects, etc.

Last edited by rkelsen; 10-11-2021 at 02:41 AM.
 
1 members found this post helpful.
Old 10-11-2021, 07:46 AM   #3
TB0ne
LQ Guru
 
Registered: Jul 2003
Location: Birmingham, Alabama
Distribution: SuSE, RedHat, Slack,CentOS
Posts: 24,172

Rep: Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122Reputation: 7122
Quote:
Originally Posted by fawaz25 View Post
Hello Linux/VMWare community,

I am facing issues after rebooting one of my RedHat Linux7 server in VMWare VSphere 7 environment. Server is not booting up after rebooting the server. It is unable to boot from disk. It says Operating System not found.. it is unable to find the disk to boot from ..

The VM is a backup VM which is used to take backups of other VMs and also used to restore the VMs from backup. I see that there are multiple disks of different VMs (that were being backed up) attached to this VM. Some of them are still attached to this VM. Some of the virtual hard disks are of bus type SATA while others are SCSI bus type. And the server was rebooted after verifying no active backup job being run on the VM. After reboot, server is not booting up..

I checked the VM options, went into BIOS and selected Hard disk to be at the top of the boot order and tried to check the hard disk sequence to boot from.. But I am unable to find SCSI0:0 disk in the list of hard disks inside BIOS that holds my Operating system. On the screen to change boot priority, I can just see hard disks with bustype SATA maximizing the Hard disk options. I am unable to see any disks with bus type SCSI in that menu.. so I am unable to force the VM to boot from specific hard disk that has my OS. or atleast put my hard disk which has OS to be at the top in Hard disk priority.

Do you have any suggestions? Any suggestions would be highlights appreciated.
It's been suggested to you for quite some time now to actually pay for support for the commercial products you're using, such as Oracle, RAC, RHEL, and VSphere. When you do so, you can get assistance easily.

Beyond that, rkelsen gave some good advice. But you again aren't giving us any details, like what kind of server this is, with what hardware/disks, etc. Too many variables to guess at. If you have ONE VM server that's working on that box, that rules out a lot...which leaves you that one disk. Since we don't know what type of disk it is past SCSI, or how it's connected, can't offer more advice other than "check that disk".
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] No package 'x11' found No package 'xext' found No package 'xdamage' found No package 'xfixes' found No package 'x11-xcb' found Jigsaw Linux From Scratch 14 02-23-2021 08:35 PM
LXer: The non-operating system operating system LXer Syndicated Linux News 0 06-26-2010 05:42 PM
'Operating system not found' Any operating system installed wont work. TechniSlave Linux - Newbie 55 02-09-2009 11:02 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Virtualization and Cloud

All times are GMT -5. The time now is 09:23 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration