linux-kernel - Re: [RFC Patch] virtio: export model and type in /sys

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Date:	Tue, 1 Feb 2011 12:41:02 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Anthony Liguori <aliguori@...ux.vnet.ibm.com>
Cc:	Cong Wang <amwang@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	Jamie Lokier <jamie@...reable.org>,
	Thomas Weber <swirl@....li>,
	Ben Hutchings <ben@...adent.org.uk>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Andy Fleming <afleming@...escale.com>,
	"David S. Miller" <davem@...emloft.net>,
	Neil Horman <nhorman@...hat.com>
Subject: Re: [RFC Patch] virtio: export model and type in /sys

On Mon, Jan 31, 2011 at 08:02:19AM -0600, Anthony Liguori wrote:
> Uniquely identify the disk or identify the class of disk?
> 
> If it's the former, would serial be a better attribute to key off of?

It wouldn't just be the better way but the only working way.  

>From one of my test systems:

$ for i in /sys/block/*/device; do echo "vendor = $(cat $i/vendor) model = $(cat $i/model) type = $(cat $i/type)"; done
vendor = ServeRA  model = RAID 1           type = 0
vendor = HP       model = MSA2012fc        type = 0
vendor = HP       model = MSA2012fc        type = 0
vendor = HP       model = MSA2012fc        type = 0
vendor = HP       model = MSA2012fc        type = 0
vendor = NETAPP   model = LUN              type = 0
vendor = NETAPP   model = LUN              type = 0
vendor = MATSHITA model = UJDA780 DVD/CDRW type = 5

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