Users Guide

Storage Solutions Guide 29
• LUNs that store virtual machine data should reside on a fault tolerant
disk group.
• Each virtual machine should have its own unique set of LUNs that
contain the virtual machine files and virtual machine hard drives.
4 Provide virtual machines with the provisioned storage as either
passthrough disks or format the disks and place VHDs on the formatted
partition (see "Appendix B: Preparing Storage for Your VMs" on page 40).
5 After creating and starting each VM, update SCSI timeout values within
the guest OS.
NOTE: Failure to update the SCSI timeout values within the guest OS may
result in unexpected behavior such as guest OS reboots or freezes.
For VMs running a Microsoft operating system, perform the following
steps:
a Ty p e regedit at the command prompt, and then press <Enter>.
The
Registry Editor window appears.
b In the left pane of the Registry Editor window, locate the following
registry path:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\disk\TimeOutValue
c In the right pane of the Registry Editor window, verify that the key
value is set to 0x000000a0 (160).
d Close the Registry Editor window and reboot the VM.
For VMs running a Linux operating system with the 2.6 kernel, perform
the following steps:
a Create a new udev rule by creating a file with the name 96-dell-
sto.rules
at /etc/udev/rules.d/.
b Type the following text (case sensitive) within the file and save the
file:
KERNEL=="sd*[!0-9]", ACTION=="add", RUN+=
"/bin/sh -c 'echo 200 >
/sys$DEVPATH/device/timeout'"
c Reboot the VM.