linux-kernel - RE: Drivers: scsi

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Message-ID: <426367E2313C2449837CD2DE46E7EAF930DF9113@SN2PRD0310MB382.namprd03.prod.outlook.com>
Date:	Sun, 4 Nov 2012 15:26:31 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: Drivers: scsi



> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@...senPartnership.com]
> Sent: Sunday, November 04, 2012 4:39 AM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com; hch@...radead.org; linux-
> scsi@...r.kernel.org
> Subject: Re: Drivers: scsi
> 
> On Sat, 2012-11-03 at 09:40 -0700, K. Y. Srinivasan wrote:
> > Do we currently support dynamic re-sizing of LUNs. Hyper-V can
> > notify capacity change via sense data and I was wondering if this
> > is handled in the generic scsi code.
> 
> Depends what you mean by "dynamic".  Experience shows that most users
> really don't want all this to happen without manual intervention
> (particularly on shrink).  However, we have the mechanics in place.
> Just send ASC/Q 2A/09 and it can get vectored up to LVM which resizes
> the volume and can be scripted automatically to resize the filesystem.
> 
> hypervisor people tend to have problems with scripting, so there are
> some hacks that do this outside of the normal event system ... see for
> example virtio_scsi.c

Thanks for the prompt response.

Regards,

K. Y