Does Windows still request disk VPD?

NTDEV
1

I thought that Windows found it useful to request the drive vital product data from page 0x83 of the SCSI Inquiry data.

I am currently testing my storport driver on Server 2008R2 and I don’t see this request happening. How does Windows uniquely identify a disk without this information?

2

Are you seeing the page 80 fetch instead?

Mark Roddy

On Wed, Sep 22, 2010 at 12:49 PM, wrote:

> I thought that Windows found it useful to request the drive vital product
> data from page 0x83 of the SCSI Inquiry data.
>
> I am currently testing my storport driver on Server 2008R2 and I don’t see
> this request happening. How does Windows uniquely identify a disk without
> this information?
>
> —
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3

>I am currently testing my storport driver on Server 2008R2 and I don’t see this request happening.

Do you specify page 0x83 in a replay from page 0 of EnableVitalProductData? If you do, you
should get a request on page 0x83.

How does Windows uniquely identify a disk without this information?

Despite a fact that WDK documentation says
“RAID Adapters that expose virtual logical units are required to support SCSI Inquiry Vital Product Data pages 00h, 80h, and 83h” I saw that some RAID adapters specify only 0 and 0x80 pages. In fact 0x83 page may be extra because an identifier could be set from VendorID+ProductID+serial_number. This data required from INQUIRY and page 0x80.

Igor Sharovar

4

I am not seeing any Inquiry page requests except for page 0.
There is no EVPD bit being set either.

All requests are issued by Windows and I know that I used to see VPD requests.
But I have not looked for them in quite some time.

I see INQUIRY, REPORT_LUNS, READ for each device.

5

>I am not seeing any Inquiry page requests except for page 0. There is no EVPD bit being set >either.
It is strange. Usually storport sends after INQUIRY with EVPD = 0 another INQUIRY with EVPD=1 for page 0. Storport even uses the same allocated SRB for both commands. Try to debug storport to see what could trigger such condition.

Igor Sharovar

6

I have no source code for storport. I think it will be difficult to debug.

7

>I have no source code for storport. I think it will be difficult to debug.
I mean debug disassembler code. Stop in your INQUIRY routine and see a stack. You should see some storport routines which called your driver BuildIO and StartIO. Put a breakpoint on return of the nearest storport function in the stack and continue to debug. Should be a condition which prevent storport of sending INQUIRY with EVPD.

Igor Sharovar

8

You have the source for the Disk.sys in the WDK, so you can see all the requests that it will send…

–Mark Cariddi
OSR Open Systems Resources Inc.

-----Original Message-----
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Sent: Wednesday, September 22, 2010 4:06 PM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] Does Windows still request disk VPD?

I am not seeing any Inquiry page requests except for page 0.
There is no EVPD bit being set either.

All requests are issued by Windows and I know that I used to see VPD requests.
But I have not looked for them in quite some time.

I see INQUIRY, REPORT_LUNS, READ for each device.

NTDEV is sponsored by OSR

For our schedule of WDF, WDM, debugging and other seminars visit:
http://www.osr.com/seminars

To unsubscribe, visit the List Server section of OSR Online at http://www.osronline.com/page.cfm?name=ListServer

9

I would like to add to Mark comment that busTrace may help you also.

Igor Sharovar