Vmware Esxi hard disk setup for VM


We have a dell r710 Server with ESXi 4.0 Raid 5 SAS for the datastore (local storage)

Just wanted to know how to setup the hard drive for the virtual server.

Do we setup The SCSI controller as LSI SAS or LSI Parallel?   The drive is only accessable using the parallel option when installing windows 2003.  Is there any advantage in using the SAS option (Speed)
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The backend for Buslogic / LSILogic is almost identical, with very minor differences due to the hardware specs being different. The differences only apply during device driver loading, and should not affect I/O speed. This is depend on your disk speed.
The real reason for two controllers is driver support. Older OSes have default driver support for Buslogic (e.g.Windows 2000 install CD), newer OSes do not have Buslogic drivers but do have LSILogic drivers (e.g. Windows2003, 2008 install CDs). Pick the controller for which it is easier to obtain a driver for the guest.Windows 2000 has by default the BusLogic driver, and Windows 2003 the LSI Logic parllel.
Just my 2 ¢
1/ RAID 5 is terrible at random write usage. It should be reserved to Backup/Archive/WORM usages only.
2/ WMWare paravirtual would have been the answer for Win2008
*LSI Logic SAS is intended for use with Windows 2008 only for clustering.
*Use LSI logic parallel for windows 2008 if you don't need to configure clustering.
*VMware Paravirtual SCSI (PVSCSI) adapters are high-performance storage adapters that can result in greater throughput and lower CPU utilization. PVSCSI adapters are best suited for environments, especially SAN environments, where hardware or applications drive a very high amount of I/O throughput. PVSCSI adapters are not suited for DAS environments.
Paravirtual SCSI adapters are supported on the following guest operating systems:

      Windows Server 2008
      Windows Server 2003
      Red Hat Enterprise Linux (RHEL) 5

Paravirtual SCSI adapters also have the following limitations:

      Hot add or hot remove requires a bus rescan from within the guest.
      Disks with snapshots might not experience performance gains when used on Paravirtual SCSI adapters or if memory on the ESX host is overcommitted.
      If you upgrade from RHEL 5 to an unsupported kernel, you might not be able to access data on the virtual machine's PVSCSI disks. You can runvmware-config-tools.pl with the kernel-version parameter to regain access.
      Because the default type of newly hot-added SCSI adapter depends on the type of primary (boot) SCSI controller, hot-adding a PVSCSI adapter is not supported.
      Booting a Linux guest from a disk attached to a PVSCSI adapter is not supported. A disk attached using PVSCSI can be used as a data drive, not a system or boot drive. Booting a Microsoft Windows guest from a disk attached to a PVSCSI adapter is not supported in versions of ESX prior to ESX 4.0 Update 1.

Hope this helps.

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It doesn't really matter since the VMs just use whatever storage controller contains the datastore on the host. You probably won't notice the difference between them. I suggest to go with LSI Logic Parallel (default option) since there is no need to set software RAID on existing HW RAID (Dell).

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