On 07/17/2012 11:59 PM, James Bottomley wrote: > On Tue, 2012-07-17 at 12:36 -0400, Christoph Hellwig wrote: >> On Tue, Jul 17, 2012 at 10:11:57AM +0100, James Bottomley wrote: >>> There's no such thing in the market today as a removable disk that's >>> resizeable. Removable disks are for things like backup cartridges and >>> ageing jazz drives. Worse: most removeable devices today are USB card >>> readers whose standards compliance varies from iffy to non existent. >>> Resizeable disks are currently the province of storage arrays. >> >> The virtual disks exported by aacraid are both marked removable and >> can be resized. > > So what are properties of these things? ... or is this just an instance > of a RAID manufacturer hacking around a problem by adding a removable > flag? > Presumably. The general intention is to automatically catch any disk resizing. As the SCSI stack (used to) ignore these things that was their way of working around it. Curiously, though; the aacraid driver is the only one doing this, plus the process is quite involved (using a proprietary application for doing so etc). None of the FC driver do this, despite the fact that resizing a disk is even easier here. I even tried to remove that line once, but then got told off by then Adaptec that I would break their apps. Since then there's a patch in the SLES kernel for adding a module option switching off this behaviour. We should ask Adaptec/PMC-Sierra here. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
