There are a bunch of issues including requiring GPT. These have all been
addressed in Server 2003 SP1 for all platforms (and XP x64 which is
built from this code base). Start here
http://www.microsoft.com/whdc/device/storage/LUN_SP1.mspx
You will also need make sure the miniport doesn’t prevent 16-byte CDBs
from going to the devices (some SCSI HBAs don’t support them).
To answer your two questions which are really just one:
READ CAPACITY: During disk initialization time, the disk class driver
will send a READ CAPACITY (10) to query for the capacity of the device.
If this command returns 0xFFFFFFFF as the RETURNED LOGICAL BLOCK ADDRESS
a READ CAPACITY (16) command will be sent to get the full disk capacity.
If this succeeds, the device will be marked as a 16-byte CDB capable
device. Otherwise, it will not be used.
This behavior is all documented in SBC-2 (See www.t10.org). Don’t fail
the READ CAPACITY (10) or your disk won’t be usable. Port driver doesn’t
get involved in any of this.
-----Original Message-----
From: Eschmann, Michael K [mailto:xxxxx@intel.com]
Sent: Wednesday, December 14, 2005 6:04 PM
Subject: RE: Read_Capacity16 in Scsi Miniport Driver.
There is a more fundamental issue: Windows XP earlier OS versions only
supports SRBs with a 32-bit LBA, so you inherently get limited to 2TB
for a 512 byte sector size.
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Driver Coder
Sent: Wednesday, December 14, 2005 10:09 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Read_Capacity16 in Scsi Miniport Driver.
Hi Everyone,
I am running in a problem where the windows does not recognize
disk arrays of more than 2.4 TB. I Isolated the problem to a command
that was not supported in my miniport driver. I think that for this size
array the miniport needs to support
READ_CAPACITY16 command.
My Question is:
- How does PORT driver know that it has to fire
read_capacity_16 command ?
- For this size array do we need to fail the Read_capacity command and
then PORT driver will then fire READ_CAPACITY16 command?
Any help is appriciated.
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