[stgt] [linux-iscsi-users] 2TB+ LUNs?

Mike Christie michaelc at cs.wisc.edu
Thu Jan 29 23:32:22 CET 2009

Richard Sharpe wrote:
> On Tue, Jan 27, 2009 at 12:57 PM, Mike Christie <michaelc at cs.wisc.edu> wrote:
>> Ray Van Dolson wrote:
>>> Hello all, I'm running the iscsi-initiator-utils package v4.0.3.0
>>> (included with RHEL4) and trying to link up to a 2TB LUN exported from
>>> a RHEL5.2 machine using STGT (0.20070620snap).
>>> The RHEL4 machine is running 32-bit while the RHEL5 machine is 64-bit.
>>> When I log in to the target, I see the following in dmesg:
>>>  iscsi-sfnet:host2: Session established
>>>  scsi2 : SFNet iSCSI driver
>>>  scsi: unknown device type 12
>>>    Vendor: IET       Model: Controler         Rev: 0001
>>>    Type:   RAID                               ANSI SCSI revision: 05
>>>  Attached scsi generic sg2 at scsi2, channel 0, id 0, lun 0,  type 12
>>>    Vendor: IET       Model: VIRTUAL-DISK      Rev: 0001
>>>    Type:   Direct-Access                      ANSI SCSI revision: 05
>>>  sdb : very big device. try to use READ CAPACITY(16).
> This means that the kernel wanted to treat the device as larger than 2TiB.
>>>  sdb : READ CAPACITY(16) failed.
> It tried to send a READ CAPACITY (16) which is a 16-byte CDB. However,
> the SCSI LLD that is the initiator has to set the size of the largest
> CDBs it accepts, and the default is 12, as I recall. 

It is 16 in RHEL 4.7 (I think we got this fixed in RHEL4 since .5).
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