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Re: [linux-lvm] EMC Storage + LVM + XFS



On Fri, May 25, 2001 at 05:09:08PM +0200, Stephan Austermuehle wrote:
> On Fri, May 25, 2001 at 09:47:34AM -0500, Austin Gonyou wrote:
> > I don't think I'm clear on your statement. As far as I know, which is a
> > lot about EMC, you can definitely plug disks online. Having Linux see
> > them? Not necessarily so, but I believe the polling interval for the Fibre
> > driver will take care of that.
> 
> Oh, of course the Symmetrix allows hot plugging of disks and online
> mapping of hypers to one or more channels via a Bin upgrade or the
> SDR. But at the moment I do not know any way to make Linux recognise
> the additional disks without reloading (rebooting) the driver. But
> even if there's a way to online detect new disks -- if a vgscan is
> necessary to tell the Linux LVM about where its VGs have gone it isn't
> a very smart solution because it often requires application down time.

I believe if you write things to /proc/scsi/scsi to make linux detect
new devices, they will be added _after_ the existing ones. The order
will not be messed up until next reboot, and then vgscan will take care
of it. Someone please correct me if I'm wrong :)


-- 
Ragnar Kjørstad
Big Storage


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