Re: [Xen-devel] [RFC PATCH] xen-block: introduces extra request to pass-through SCSI commands

[Bob Liu <bob.liu@xxxxxxxxxx>]

On 03/02/2016 07:40 PM, Ian Jackson wrote:
> Bob Liu writes ("Re: [RFC PATCH] xen-block: introduces extra request to 
> pass-through SCSI commands"):
>> Do you know whether pvscsi can work on top of multipath(the device-mapper 
>> framework) or LVMs?
> 
> No, it can't.  devmapper and LVM work with the block device
> abstraction.
> 
> Implicitly you seem to be suggesting that you want to use dm-multipath
> and LVM, but also send other SCSI CDBs from the upper layers through
> to the underlying SCSI storage target.
> 

Exactly!

> I can't see how that could cause anything but pain.  In many cases
> "the underlying SCSI storage target" wouldn't be well defined.  Even
> if it was, these side channel SCSI commands are likely to Go Wrong in
> exciting ways.
> 
> What SCSI commands do you want to send ?
> 

* INQUIRY

* PERSISTENT RESERVE IN
* PERSISTENT RESERVE OUT
This is for Failover Clusters in Windows, not sure whether more commands are 
required.
I didn't get a required scsi commands list in the failover document.

-- 
Regards,
-Bob

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