HP HSG80 Microsoft Windows NT, Windows Using Large LUNs While in SCSI-2 Mode, Association Sets

Platform-Specific Issues

Windows 2000 Plug and Play Manager Generates Numerous Pop-up Windows

Each time a LUN is dismounted ungracefully (for example a fabric failure), Windows 2000 displays a pop-up window that warns of “Unsafe removal of device.” This window can be cleared by simply clicking OK. The window itself is harmless, but additional dismounts cause more pop-up windows to appear. These windows can stack up on the desktop and consume memory to the point that the system crashes. However, several hundred dismounts and associated pop-up messages are required before a system crash is probable.

Windows Using Large LUNs While in SCSI-2 Mode

DRM supports Windows 2000 hosts accessing large LUNs above D7 without offsets via Secure Path. However, all hosts using large LUNs on a controller in SCSI-2 mode must create a dummy LUN 0 and give access to this LUN. HP also recommends that this phantom LUN be set to “no write” access. Refer to the HP StorageWorks Secure Path for Windows Installation and Reference Guide for additional information.

Association Sets

In a Windows 2000 cluster configuration, all remote copy sets within an association set must be placed in one cluster resource group.

Microsoft Windows NT

Auto Failback

The Secure Path for Windows NT Auto Failback feature is not currently supported in a Data Replication Manager configuration. Disable this feature by starting Secure Path Manager, and then selecting Properties > Autofailback > Disable.

LUNs Lettered Incorrectly

When LUNs are moved between hosts (such as during a site failover or a site failback), the LUNs may become “out of letter order.”

To prevent the “out of letter order” status, follow the steps below:

1.Before booting the Windows NT-X86 host, make sure all LUNs are failed over to one HSG80 path. From the HSG80 CLI prompt, issue the following command:

Restart Other_Controller

2.Reboot the Windows NT-X86 host.

3.Use Disk Administrator to assign the correct drive letter so that the disks will now match the units on the controller.

4.Once Windows NT sees the disks ordered properly, use Secure Path Manager to move the units to the correct path.

Windows Using Large LUNs While in SCSI-2 Mode

DRM supports Windows NT hosts accessing large LUNs above D7 without offsets via Secure Path. However, all hosts using large LUNs on a controller in SCSI-2 mode must create a dummy LUN 0 and give access to this LUN. HP also recommends that this phantom LUN be set to “no write” access. Refer to the HP StorageWorks Secure Path for Windows Installation and Reference Guide for additional information.

Data Replication Manager HSG80 ACS Version 8.7P Release Notes 15