Re: [PATCH] scsi: devinfo: Add Microsoft iSCSI target to 1024 sector blacklist

Ross Lagerwall
2018-04-05T16:58:13Z

On 03/28/2018 11:33 PM, Long Li wrote:
>> Subject: Re: [PATCH] scsi: devinfo: Add Microsoft iSCSI target to 1024 sector
>> blacklist
>>
>>
>> Long, KY: Please confirm.
>>
>>> The Windows Server 2016 iSCSI target doesn't work with the Linux
>>> kernel initiator since the kernel started sending larger requests by
>>> default, nor does it implement the block limits VPD page. Apply the
>>> sector limit workaround for these targets.
>>>
>>> Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
>>> ---
>>> drivers/scsi/scsi_devinfo.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
>>> index f3b1172..5cb748a 100644
>>> --- a/drivers/scsi/scsi_devinfo.c
>>> +++ b/drivers/scsi/scsi_devinfo.c
>>> @@ -213,7 +213,7 @@ static struct {
>>> {"Medion", "Flash XL MMC/SD", "2.6D", BLIST_FORCELUN},
>>> {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
>>> {"MICROP", "4110", NULL, BLIST_NOTQ},
>>> - {"MSFT", "Virtual HD", NULL, BLIST_NO_RSOC},
>>> + {"MSFT", "Virtual HD", NULL, BLIST_MAX_1024 | BLIST_NO_RSOC},
>
> Ross,
>
> What about storage_channel_properties.max_transfer_bytes returned from VSTOR_OPERATION_QUERY_PROPERTIES (in storvsc_channel_init())
>
> Does it return correctly the maximum transfer size for iSCSI?
>

I presume you're referring to the Hyper-V virtual storage driver? This
has nothing to do with that module -- I don't even have it compiled in.
It's just simply the Linux kernel initiator connecting over plain
software iSCSI to a Windows Server 2016 iSCSI target.

This is easy enough to reproduce. Just set up a Windows Server 2016
target and try and use it from Linux. You get I/O errors as soon as you
try and format the disk.

Cheers,
--
Ross Lagerwall