214 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
4. In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B
FC1-08002BE10318}\<bus ID>\Parameters\MaxPendingRequests
Confirm that the value for the MaxPendingRequests key is 2048 (decimal value) and, if not,
change the value to 2048.
5. In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Disk\TimeOutValue
Confirm that the value for the TimeOutValue key is 60 (decimal value) and, if not, change
the value to 60.
6. Restart your host for these changes to take effect.
Multipath support for iSCSI on Windows
For multipathing with iSCSI, we need to enable Microsoft Multipath Input/Output (MPIO). See
“Installing the multipathing software” on page 203 for instructions to enable MPIO.
These basic steps are to prepare a Windows 2008 R2 or Windows 2012 R2 host for iSCSI
attachment. To configure the IBM Storwize V5000 for iSCSI connections, see 5.5.3, “Creating
iSCSI hosts” on page 249.
5.3.3 Windows 2012 R2: Preparing for SAS attachment
This procedure is described in the following sections.
Installing and updating supported HBAs
Install a supported SAS HBA with the latest supported firmware and drivers for your
configuration. A list of the latest supported HBAs and levels for Windows 2008 R2, Windows
2012 R2, and other operating systems is available at the IBM System Storage Interoperation
Center (SSIC) website at the following link:
https://ibm.biz/BdjyuP
Install the driver by using Windows Device Manager or vendor tools. Also, check and update
the firmware level of the HBA by using the manufacturer’s provided tools. Always check the
readme file to see whether any Windows registry parameters must be set for the HBA driver.
Determining host WWPNs
The worldwide port names (WWPNs) of the SAS HBA are required to configure host
attachment on the IBM Storwize V5000.
You can obtain the host WWPNs through vendor tools or the HBA BIOS. However, the easiest
way is to connect the SAS cables to the ports on the IBM Storwize V5000, log on to the
Storwize CLI through Secure Shell (SSH), and run svcinfo lsssasportcandidate, as shown
in Example 5-5.
Example 5-5 Finding host WWPNs
IBM_Storwize:ITSO_V5000:superuser>svcinfo lsssasportcandidate
sas_WWPN
Important: IBM Subsystem Device Driver DSM (SDDDSM) is not supported for iSCSI
attachment. Do not follow the steps to install SDDDSM that you follow to install FC or SAS.
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