Installation guide

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Disks on Paravirtual SCSI adapters might not experience performance gains if they have snapshots or if
memory on the ESX host is over committed.
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If you upgrade from RHEL 5 to an unsupported kernel, you might not be able to access data on the disks
attached to a Paravirtual SCSI adapter. To regain access to such disks, run the VMware Tools configuration
(vmware-config-tools.pl) with kernel-version parameter and pass the kernel version after the kernel is
upgraded and before the virtual machine is rebooted. Run uname -r to determine the version of the running
kernel.
Select a SCSI Adapter
The Select SCSI Controller Type page enables you to select one of the following types of SCSI controllers. The
choice of SCSI controller does not affect whether your virtual disk is an IDE or SCSI disk.
The IDE adapter is always ATAPI. The default for your guest operating system is already selected. Older guest
operating systems default to the BusLogic adapter.
If you create an LSI Logic virtual machine and add a virtual disk that uses BusLogic adapters, the virtual
machine boots from the BusLogic adapters disk. LSI Logic SAS is available only for virtual machines with
hardware version 7. Disks with snapshots might not experience performance gains when used on LSI Logic
SAS and LSI Logic Parallel adapters.
Procedure
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Choose one of the following SCSI controller types:
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BusLogic Parallel
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LSI Logic SAS
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LSI Logic Parallel
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VMware Paravirtual
Selecting a Virtual Disk Type
A virtual disk comprises one or more files on the file system that appear as a single hard disk to the guest
operating system. These disks are portable among hosts.
You can select among the following options:
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“Create a Virtual Disk,” on page 120
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“Use an Existing Virtual Disk,” on page 120
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“Create Raw Device Mappings,” on page 121
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“Do Not Create a Disk,” on page 121
Chapter 11 Creating Virtual Machines
VMware, Inc. 119