From: Bob Liu <bob.liu@oracle.com>
To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Juergen Gross <jgross@suse.com>,
xen-devel@lists.xen.org, paul.durrant@citrix.com,
jbeulich@suse.com, roger.pau@citrix.com
Subject: Re: [RFC PATCH] xen-block: introduces extra request to pass-through SCSI commands
Date: Wed, 02 Mar 2016 20:28:46 +0800 [thread overview]
Message-ID: <56D6DC7E.60309@oracle.com> (raw)
In-Reply-To: <22230.53568.611012.157376@mariner.uk.xensource.com>
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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next prev parent reply other threads:[~2016-03-02 12:28 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 3:37 [RFC PATCH] xen-block: introduces extra request to pass-through SCSI commands Bob Liu
2016-02-29 8:12 ` Juergen Gross
2016-02-29 15:05 ` Konrad Rzeszutek Wilk
2016-02-29 15:34 ` Juergen Gross
2016-02-29 9:13 ` Paul Durrant
2016-02-29 14:55 ` Konrad Rzeszutek Wilk
2016-02-29 15:28 ` Paul Durrant
2016-02-29 15:35 ` Roger Pau Monné
2016-02-29 16:48 ` Konrad Rzeszutek Wilk
2016-02-29 16:56 ` Paul Durrant
2016-02-29 16:14 ` Ian Jackson
2016-02-29 16:29 ` Ian Jackson
2016-02-29 23:45 ` Bob Liu
2016-02-29 23:45 ` Bob Liu
2016-03-01 18:08 ` Ian Jackson
2016-03-02 7:39 ` Juergen Gross
2016-03-02 7:57 ` Bob Liu
2016-03-02 11:40 ` Ian Jackson
2016-03-02 11:46 ` Paul Durrant
2016-03-02 12:00 ` Juergen Gross
2016-03-02 12:28 ` Bob Liu [this message]
2016-03-02 14:44 ` Ian Jackson
[not found] ` <20160302172257.GC27821@char.us.oracle.com>
2016-03-03 11:54 ` Paul Durrant
2016-03-03 12:03 ` Ian Jackson
2016-03-03 12:25 ` Juergen Gross
2016-03-03 14:07 ` Konrad Rzeszutek Wilk
2016-03-03 14:19 ` Paul Durrant
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