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

[Ross Lagerwall]

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@xxxxxxxxxx>
> > > ---
> > >   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