Contents of this articleThere are two ways you might want to proceed depending on whether you have already deployed some Windows 2016 VMs or you're building a new VM from scratch.
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VMware Tools & Paravirtual SCSI Controller. Okay, I have a Guest OS - 2016 Standard with VMware Paravirtual Driver installed as BOOT device. Would you recommend the LSI Logic SaS controller as the better controller option? Andrew Hancock (VMware. By default for Windows Server 2008 and above, the default virtual SCSI controller is the LSI Logic SAS disk controller. It’s there for compatibility purposes, and piggybacks the existing driver that is built into the operating system. It works great because it always ‘just works’. FYI - I tried changing from LSI scsi to PVSCSI on a windows 2008 server that already. But meanwhile use the LSI Logic SAS controller for XP. VMware 6.5 - LSI Logic SAS vs VMware Paravirtual SCSI controllers (self.sysadmin) submitted 7 months ago by kickflipper1087 Sysadmin. Hey all, Has anyone noticed any benefits of using one over the other? When setting up a new virtual machine, you can choose.
- Case 1: Change from LSI Logic SAS to VMware Paravirtual SCSI on a Windows Server 2016 VM
- Case 2: Prepare a new VM with VMware Paravirtual for a boot disk
- Wrap-up
PVSCSI adapters are high-performance storage adapters that can provide greater throughput and lower CPU utilization. PVSCSI adapters are best for environments, especially SAN environments, where hardware or applications drive a very high amount of I/O throughput (as with databases). PVSCSI adapters are not suitable for direct attached storage (DAS) environments.
VMware's preconfigured VM templates don't always use the storage controllers that have the best performance. The reason is that Windows 2016 does not come with the corresponding drivers. The result is that it is impossible to install a new VM running Windows Server 2016 out of the box.
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Case 1: Change from LSI Logic SAS to VMware Paravirtual SCSI on a Windows Server 2016 VM ^
I assume you have a traditional VM with a single virtual disk configured. You'll need to proceed outside of business hours, as the steps require rebooting the VM several times.
First, add a new storage controller to your VM and change the type to VMware Paravirtual.
Add a new SCSI controller and change the type to VMware ParavirtualThen add a small 2 GB hard disk and attach it to SCSI controller 1 (make sure to select SCSI 1:0 as the connection). This disk is not a system disk, so the VM will boot normally, and the Windows operating system will automatically find the drivers it can use to install this VMware Paravirtual controller.
Add a new disk and attach it to the newly added SCSI controllerAfter the OS finds drivers for the disk, make sure the disk appears in the Disk Management console, so you can initialize, format the disk, and bring it online.
Once done, gracefully shut down the VM and change the first SCSI controller 0 to VMware Paravirtual, and then click the Change type button.
Change the type for SCSI controller 0 to VMware ParavirtualYou can boot the VM, as the OS is now aware that some of its controllers are using VMware Paravirtual, thus it can boot successfully. The OS already installed the drivers with the previous step.
As mentioned before, this was for the case in which you have already some VMs (including Windows Server 2008 R2 or Server 2012 R2 VMs) up and running, and you just want to change the controller type for those VMs.
If you create a new VM, you can do it as described below.
Case 2: Prepare a new VM with VMware Paravirtual for a boot disk ^
You can download the latest VMware tools from VMware, or you can use the one bundled with your ESXi installation within the Locker directory. The corresponding ISO image files are located at /locker/packages/.
You can get the latest ISO (Windows.iso) from VMware's website.
During the installation process when the Windows Server installer asks you where you want to install (and you don't see any volumes), just click the Load driver link.
Load the VMware Paravirtual driverMake sure you previously mounted the 'Windows.iso' you downloaded from VMware, as a second CD/DVD to your VM.
Then browse the ISO and locate the driver.
Pick a VMware PVSCSI driverThe driver path will display within the setup window. Click Next to load the driver.
The driver displays in the windowAfter that, a new unallocated space shows up.
Unallocated spaceWrap-up ^
I described two ways to set up a Windows Server 2016 VM with a VMware Paravirtual SCSI. The two main benefits are the increased throughput and lower CPU usage.
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Free tool to hot-migrate VMs from one vCenter serv..I have a VMWare Redhat machine that I need to change the SCSI controller on the machine from a LSI Logic Parallel to LSI Logic SAS. I have done this through vmware, but now when the box tries to boot it kernel panics saying that it cant mount /dev/root
Can anyone help with this as I am unable to find much information on it and really dont want to rebuild the machine.
Thanks
ardard
4 Answers
If it's RHEL 5 or 6, then don't use any of the two LSI controllers in virtual machine definition. Use the paravirtualised storage driver.
See this VMware KB article for the supported configurations and migration procedure.
Paweł BrodackiPaweł Brodacki
The LSI Logic SAS virtual controller is really only there for Windows 2008 to allow for clustering. Use one of the other virtual controllers instead.
Chopper3Chopper3
In RHEL 7.x this is a bit different as modprobe.conf doesn't exist.
In my case I needed to change the controller for the root disk from Paravirtual to LSI Logic SAS. As the previous posts suggest, this needs to be done in two places, the regular disk and the RamDisk as both will need to boot with the new driver.
First, if possible, clone your machine, don't snapshot it. Whenever you are working with disks, it's best not to involve snapshots.You may not need to do this second step, I did it in the theory that the disk controller would initialize itself if introduced to the system through an additional disk, just like you'd do for Windows:Second step - Shut down your VM, Attach a 1 GB disk using the SCSI controller type you'd like to change your root disk to and bring the system back up to modprobe discover it. (You might be able to do this hot)Third step - run the following command to add the correct driver to the RamDisk (Remember in my case I was moving from the VMWare Paravirtual to the LSI Logic SAS driver. It's likely you are going the opposite way, but you just need to change the driver type:dracut -f -v --add-drivers mptsas
In my case I needed to change the controller for the root disk from Paravirtual to LSI Logic SAS. As the previous posts suggest, this needs to be done in two places, the regular disk and the RamDisk as both will need to boot with the new driver.
First, if possible, clone your machine, don't snapshot it. Whenever you are working with disks, it's best not to involve snapshots.You may not need to do this second step, I did it in the theory that the disk controller would initialize itself if introduced to the system through an additional disk, just like you'd do for Windows:Second step - Shut down your VM, Attach a 1 GB disk using the SCSI controller type you'd like to change your root disk to and bring the system back up to modprobe discover it. (You might be able to do this hot)Third step - run the following command to add the correct driver to the RamDisk (Remember in my case I was moving from the VMWare Paravirtual to the LSI Logic SAS driver. It's likely you are going the opposite way, but you just need to change the driver type:dracut -f -v --add-drivers mptsas
Other options for drivers are:mptspimptscsihmptbase
After doing this, shut down and remove the 1 GB temporary disk.Change the controller for the root disk to whatever driver you just added to the ramdisk, and boot up the system.
Humu McTriggerHumu McTrigger
The problem is that, when the system boots up, an initial ram disk is created from the contents of a file which contains certain drivers the system needs to continue booting. If that initial ram disk file doesn't contain the drivers for your system, the system will not able to boot. To resolve this, you'll need to rebuilt the initrd file using the following procedure:
- Boot the system into rescue mode from the installation disc and chroot /mnt/sysimage
- Backup your /etc/modprobe.conf file and replace any scsi_hostadapter entries in it with the following:alias scsi_hostadapter mptbasealias scsi_hostadapter1 mptspi
Vmware Paravirtual Controller
Create an initial ram disk
- cd /boot
- mv initrd-.img initrd-.img.bak (replace * with actual file name)
- mkinitrd -v -f /boot/initrd-*.img * (replace both instances of * with actual version number in the file you just renamed)
- Reboot the system
If you need to revert for any reason, simply boot back into rescue mode and revert /etc/modprobe.conf and the initrd-*.img file, then reboot.
JakePaulusJakePaulus