Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

SCSI ALUA support in a Storport Miniport Driver.

Prem_PiluPrem_Pilu Member Posts: 4

Hi All,

I am adding SCSI ALUA support in a Storport Miniport Drivers. I did the following as per SPC-3 specification
1. Set the ALUA field in SCSI standard inquiry data.
2. Added the Relative target port identifier format & Target port group identifier format in Device Identification VPD.

On loading the driver i response to following SCSI commands REPORT LUNS, 5 INQUIRY ( Standard INQUIRY data, Supported VPD pages, Device Identification VPD page, Unit Serial Number, Standard INQUIRY data) and REPORT TARGET PORT GROUPS. After receiving REPORT TARGET PORT GROUPS i get the following error

"An error occurred while the system tried to claim a Multipath I/O (MPIO) path. The location of the failing path is described by the SCSI address (4, 0, 0, 0) (Port, Bus, Target, Lun). To resolve this issue, either reboot the system, or show hidden devices in Device Manager and try uninstalling the specific disk device indicated above, and then rescan for hardware changes."

Please help me make sense of this error in relation to ALUA. How to debug this kind of issue in Windows Storage stack?

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Writing WDF Drivers 12 September 2022 Live, Online
Internals & Software Drivers 23 October 2022 Live, Online
Kernel Debugging 14 November 2022 Live, Online
Developing Minifilters 5 December 2022 Live, Online