Re: [dm-devel] [patch]: [multipath-tool] Add check for removeddevice in rdac checker

[Konrad Rzeszutek <konrad virtualiron com>]

On Tue, Oct 28, 2008 at 03:11:08PM +0530, Shyam_Iyer Dell com wrote:
> Konrad Wrote:
> > On Mon, Oct 27, 2008 at 10:11:28AM -0500, Yanqing_Liu Dell com wrote:
> > > Hi,
> > >
> > > This patch adds a check for removed device in rdac checker. After
> > > volume access inquiry returns, the checker will check the peripheral
> > > qualifier field to see if the device is deleted/unmapped. If so,
> mark
> > > path as failed.
> 
> > How does multipathd behaves when this fix is not in? Does it still
> mark the path down? I would presume so, but it would take longer (the
> default SCSI timeout value?)
> 
> Absolutely. But that would also be after some IOs on the failed path and
> the device being marked offline. Instead if the controller device is
> intelligent to support a feature to know if the path is down through an
> inquiry then it is worth marking the path down earlier. 

I concur.
> 
> Thanks for reviewing.

You are welcome.

+1