From mboxrd@z Thu Jan  1 00:00:00 1970
From: malahal@us.ibm.com
Subject: Re: Removing a failed device from LVM2/DM
Date: Tue, 1 Sep 2009 15:47:04 -0700
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Alan D. Brunelle [Alan.Brunelle@hp.com] wrote:
> Unfortunately:
> 
> # rm -rf /etc/lvm/cache
> 
> # vgscan
>   Reading all physical volumes.  This may take a while...
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 512 at 0: Input/output error
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 512 at 291347562496: Input/output error
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 512 at 291347632128: Input/output error
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 512 at 0: Input/output error
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 512 at 4096: Input/output error
>   /dev/disk/by-id/scsi-360060b0000837a508c01035ef0d00033: read failed
> after 0 of 2048 at 0: Input/output error
>   Found volume group "vg" using metadata type lvm2

Looks like you have some symbolic links that point to a dead device.
Change your filter to accept devices appropriately, maybe like below
(untested!).

filter = [ "r|sdab|", a|/dev/sd|", "r|.*|" ]

The above filter would avoid looking at /dev/disk/by-id and other
unneeded directories.

Thanks, Malahal.