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Date:      Thu, 17 Dec 1998 11:30:59 -0800 (PST)
From:      Julian Elischer <julian@whistle.com>
To:        David Greenman <dg@root.com>
Cc:        "Marc G. Fournier" <marc.fournier@acadiau.ca>, freebsd-scsi@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
Subject:   Re: any way of gleaming info from these? 
Message-ID:  <Pine.BSF.3.95.981217113030.2175A-100000@current1.whistle.com>
In-Reply-To: <199812170748.XAA19152@root.com>

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On Wed, 16 Dec 1998, David Greenman wrote:

> >On Wed, 16 Dec 1998, David Greenman wrote:
> >
> >> >vnode_pager_putpages: residual I/O 4096 at 113
> >> >vnode_pager_putpages: I/O error 6
> >> >vnode_pager_putpages: residual I/O 4096 at 113
> >> >vnode_pager_putpag_putpage_pager_putpages: residual I/O 4096 at 113
> >> >vnode_pager_putpages: I/O error 6
> >> >vnode_pager_putpages: residual I/O 4096 at 113
> >> >
> >> >maybe its totally impossible, but is there no way of detailing which drive
> >> >is causing this?  or is it not a drive?
> >> 
> >>    Error 6 is ENXIO - device not configured. This might happen if the device
> >> is SCSI and it loses power/goes offline. I can't think of any other reasons
> >> offhand.
> >
> >Hrmmm...is vnode_pager_putpages a 'file system' error, or a 'swap' error?
> >The system is locked up right now, awaiting someone to get down to the
> >office and reboot it.  
> 
>    vnode_pager_putpages is a routine, not an error (well...:-)). I don't know
> what is returning ENXIO, but putpages just calls the filesystem VOP_PUTPAGES
> entry, so you'd have to look at that. vnode_pager_putpages isn't usually
> called very often in a typical system - it's used when mapped/modified file
> pages need to be written back to the backing file, which doesn't normally
> happen on a typical system (modified pages are usually backed by swap, not
> the file).
> 
> >Looking through /usr/src/sys, the error message is generated in
> >vm/vnode_pager.c...which, to me, would indicate swap space?  
> 
>    No, the swap_pager pages out to swap. The vnode_pager pages out to files.

I THINK the vnode pager is called if you are writing to a mmapped file,
right?




> 
> -DG
> 
> David Greenman
> Co-founder/Principal Architect, The FreeBSD Project
> 
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