Re: Hammer, usb disk, SYNCHRONIZE CACHE failure

[Joe Talbott <josepht@xxxxxxxxxx>]

On Wed, Apr 08, 2009 at 10:50:09PM +0200, Michael Neumann wrote:
> Matthew Dillon wrote:
> 
> > 
> > :This is for 2.2-RELEASE.  I have a 2.5" drive in an external USB
> > :enclosure with one big Hammer filesystem on it.  The disk is ~75GB.
> > :When the daily cronjob to cleanup hammer runs it fails with these
> > :errors:
> > :
> > :Thanks,
> > :Joe
> > 
> >     I'm not sure what's going on here.  HAMMER does issue a synchronize
> >     cache
> >     op but it should be ignoring the error.  Maybe the recovery from the
> >     unsupported synchronize cache op is causing a later write op to fail.
> 
> I think there are devices that claim to support this operation but in 
> reality do not support it. Or something like this. FreeBSD has a quirk file 
> for this. For example my Seagate USB disk always prints those synchronize 
> cache failure messages on FreeBSD. Look out for NO_SYNCHRONIZE_CACHE
> in this file:
> 
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/usb/storage/umass.c?rev=1.9

I tried adding the NO_SYNCHRONIZE_CACHE quirk but got the same
results.

Joe