Re: sata_nv and RAID1

["Diego M. Vadell" <dvadell@lantech.com.ar>]

On Saturday 11 June 2005 17:29, Michael Tokarev wrote:
> Jeff Garzik wrote:
> > On Sat, Jun 11, 2005 at 04:13:42PM +0000, Diego M. Vadell wrote:
> >>Hi,
> >>   A new computer arrived at work with 4 160GB SATA disks. I made a
> >>couple of RAID 1 (mirror) with two disks each, and then joined them wih
> >>LVM. Now I have 320GB in my root volume.
> >>
> >>My boss asked me to test it, so we all gathered and unplugged the data
> >>cable of one of the disks. I was hoping to see linux making warnings for
> >
> > Hotplug is not supported yet.  Don't do that :)
>
> It isn't hotPLUG -- it's hotUNplug.  Happens when drive is dying for
> example, or when the cable is flaky, or due to millions of other
> reasons...  And.. I for one expect linux to react to such a situation
> *somehow* - after all, raid is used for this very stuff too, to be
> able to continue running a system if one of the drives failed...
>
> /mjt

So I thought... Who's fault is it? Is it something missing from sata_nv or 
from md? How hard could it be to implement (I dont know a thing, but maybe 
its just a matter of returning an error somewhere, as I dont want to retry or 
nothing but informing the md layer that it has to forget about that disk)? 
Has anybody started to do this?

Thanks a lot,
 -- Diego.