Problem With Scsi Pass Through for accessing disk drive connected through FC switch

NTDEV
1

Hello Everybody
I am using the SPTI interface to access the remote disk drive which is
mounted on my server through a FC switch.

In other words its something like this

server–>Fiberchannel Switch –> Disk Drive.

I have written a code to carry out block data read and write on this
remote disk but somehow it always fails.

The interesting points in my problem are as follows:

  • The code works perfectly fine for a local disk drive.

  • When I run the code the following IOCTL commands are succesful.

statusMain = DeviceIoControl(fileHandle,
IOCTL_SCSI_GET_INQUIRY_DATA,
NULL,
0,
bufferMain,
sizeof(bufferMain),
&returnedMain,
FALSE);

Ity always returns back me the right information about what all SCSI
devices are connected to each bus. Their path ID , LUN ID, Target ID and
so on…

But the following piece of code always fails::
ZeroMemory(&sptdwb, sizeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER));
dataBuffer =
AllocateAlignedBuffer(localThreadParam.sectorSize,localThreadParam.capabilities.AlignmentMask);

FillMemory(dataBuffer,(localThreadParam.sectorSize)/2,‘N’);
FillMemory(dataBuffer +
(localThreadParam.sectorSize)/2,localThreadParam.sectorSize/2,‘T’);

sptdwb.sptd.Length = sizeof(SCSI_PASS_THROUGH_DIRECT);
sptdwb.sptd.PathId = 0;
sptdwb.sptd.TargetId = 0;
sptdwb.sptd.Lun = 0;
sptdwb.sptd.CdbLength = CDB10GENERIC_LENGTH;
sptdwb.sptd.SenseInfoLength = 24;
sptdwb.sptd.DataIn = SCSI_IOCTL_DATA_OUT;
sptdwb.sptd.DataTransferLength = sectorSize;
sptdwb.sptd.TimeOutValue = 2;
sptdwb.sptd.DataBuffer = dataBuffer;
sptdwb.sptd.SenseInfoOffset =
offsetof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER,ucSenseBuf);
//Include this for Direct disc operations.
sptdwb.sptd.Cdb[0] = SCSIOP_WRITE;
sptdwb.sptd.Cdb[7] = (UCHAR)(localThreadParam.sectorSize >> 8);
sptdwb.sptd.Cdb[8] = 0;
length = sizeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER);

status = DeviceIoControl(localThreadParam.filehandle,
IOCTL_SCSI_PASS_THROUGH_DIRECT,
&sptdwb,
length,
&sptdwb,
length,
&returned,
FALSE);

And the same code works perfectly fine for local Disk Drive.

I am pasting below the output achieved by me when , run the above code.

***** WRITE DATA BUFFER operation *****
Scsi status: 02h

Sense Info – consult SCSI spec for details

70 00 0B 00 00 00 00 0A 00 00 00 00 00 06 00 00 00 00 5B E2 00 00 01 00

The sense data printed above is also of no use to me.

So, my question is do we need to do anything different to access a disk
drive connected through FC switch as compared to local disc drive.

Any, help will be very appreciated. Thanking in anticipation.

Regards
Biren

2

The scsi miniport must support fabric operations, since a fabric presents
itself differently than does a loop. If you are using a Qlogic driver, you
need to set FabricSupported=1 in Device Parameters. the Qlogic Readme for
your driver will tell you how to do this.

–
Gary G. Little
xxxxx@broadstor.com
xxxxx@inland.net

wrote in message news:xxxxx@ntdev…
>
> Hello Everybody
> I am using the SPTI interface to access the remote disk drive which is
> mounted on my server through a FC switch.
>
> In other words its something like this
>
> server–>Fiberchannel Switch –> Disk Drive.
>
>
> I have written a code to carry out block data read and write on this
> remote disk but somehow it always fails.
>
>
> The interesting points in my problem are as follows:
>
> - The code works perfectly fine for a local disk drive.
>
> - When I run the code the following IOCTL commands are succesful.
>
> statusMain = DeviceIoControl(fileHandle,
> IOCTL_SCSI_GET_INQUIRY_DATA,
> NULL,
> 0,
> bufferMain,
> sizeof(bufferMain),
> &returnedMain,
> FALSE);
>
> Ity always returns back me the right information about what all SCSI
> devices are connected to each bus. Their path ID , LUN ID, Target ID and
> so on…
>
> But the following piece of code always fails::
> ZeroMemory(&sptdwb, sizeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER));
> dataBuffer =
>
AllocateAlignedBuffer(localThreadParam.sectorSize,localThreadParam.capabilit
ies.AlignmentMask);
>
> FillMemory(dataBuffer,(localThreadParam.sectorSize)/2,‘N’);
> FillMemory(dataBuffer +
> (localThreadParam.sectorSize)/2,localThreadParam.sectorSize/2,‘T’);
>
> sptdwb.sptd.Length = sizeof(SCSI_PASS_THROUGH_DIRECT);
> sptdwb.sptd.PathId = 0;
> sptdwb.sptd.TargetId = 0;
> sptdwb.sptd.Lun = 0;
> sptdwb.sptd.CdbLength = CDB10GENERIC_LENGTH;
> sptdwb.sptd.SenseInfoLength = 24;
> sptdwb.sptd.DataIn = SCSI_IOCTL_DATA_OUT;
> sptdwb.sptd.DataTransferLength = sectorSize;
> sptdwb.sptd.TimeOutValue = 2;
> sptdwb.sptd.DataBuffer = dataBuffer;
> sptdwb.sptd.SenseInfoOffset =
> offsetof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER,ucSenseBuf);
> //Include this for Direct disc operations.
> sptdwb.sptd.Cdb[0] = SCSIOP_WRITE;
> sptdwb.sptd.Cdb[7] = (UCHAR)(localThreadParam.sectorSize >> 8);
> sptdwb.sptd.Cdb[8] = 0;
> length = sizeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER);
>
> status = DeviceIoControl(localThreadParam.filehandle,
> IOCTL_SCSI_PASS_THROUGH_DIRECT,
> &sptdwb,
> length,
> &sptdwb,
> length,
> &returned,
> FALSE);
>
>
> And the same code works perfectly fine for local Disk Drive.
>
> I am pasting below the output achieved by me when , run the above code.
>
> WRITE DATA BUFFER operation
> Scsi status: 02h
>
> Sense Info – consult SCSI spec for details
> -------------------------------------------------------------
> 70 00 0B 00 00 00 00 0A 00 00 00 00 00 06 00 00 00 00 5B E2 00 00 01 00
>
>
> The sense data printed above is also of no use to me.
>
>
> So, my question is do we need to do anything different to access a disk
> drive connected through FC switch as compared to local disc drive.
>
>
> Any, help will be very appreciated. Thanking in anticipation.
>
> Regards
> Biren
>
>