[mythtv-users] WD15EARS WD Green drives

[Andre]

On 24 May 2011, at 15:37, David Liana wrote:

> 
> 
> On Tue, May 24, 2011 at 9:29 AM, Andre <mythtv-list at dinkum.org.uk> wrote:
> 
> On 24 May 2011, at 14:20, Jean-Yves Avenard wrote:
> 
> > On 24 May 2011 21:34, Andre <mythtv-list at dinkum.org.uk> wrote:
> >>
> >> Did you do anything about head reloads?
> >
> > No..
> >
> > What's that?
> 
> WDXXEARS & other "Green" drives aggressively park their heads to conserve power, many believe that this quickly exceeds the head reload design life.
> 
> http://forums.anandtech.com/showthread.php?t=2085685
> 
> Mine are already showing more reloads than drives I have had for several years, I plan to address this next week.
> 
> >
> > Only symptoms is that the console got filled with stuff like:
> >
> > [ 2490.288981] ata6.00: status: { DRDY DF ERR }
> > [ 2490.288982] ata6.00: error: { ABRT }
> > [ 2490.292515] ata6.00: failed to enable AA(error_mask=0x1)
> > [ 2490.297067] ata6.00: failed to enable AA(error_mask=0x1)
> > [ 2490.297090] ata6.00: configured for UDMA/133 (device error ignored)
> > [ 2490.297107] ata6: EH complete
> > [ 2490.297400] ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> > [ 2490.297405] ata6.00: irq_stat 0x40000001
> > [ 2490.297408] ata6.00: failed command: READ DMA
> > [ 2490.297414] ata6.00: cmd c8/00:08:18:00:00/00:00:00:00:00/e0 tag 0
> > dma 4096 in
> > [ 2490.297415]          res 61/04:08:18:00:00/00:00:00:00:00/e0 Emask
> > 0x1 (device error)
> > [ 2490.297418] ata6.00: status: { DRDY DF ERR }
> >
> >
> > And the drive gets removed from my RAID array.
> 
> There are a lot of discussions about these drives being unsuitable for use in raid arrays due to long timeouts waiting for deep data recovery, TLER etc.
>  
> Isn't this more of an issue on hardware RAID's than software based RAID's?

Major show stopper on hardware raid but lots of the softraid nas box forums are full of moans and problems, also linux mdadm people reporting problems. No idea if the moans and groans were real or perceived but there seems to be a lot of moaning about the same drives.

I was happy to buy some to use purely as storage group media drives (no raid) and actually want the aggressive power management, although it's looking like even without syslog etc. waking the drive up WD's management is still too much or Myth/Ubuntu is bothering the drives even when there are no recordings in progress

 I have an AV-GP 2TB drive too and that looks like the model I'll be buying in future, I hovered for a while between the two when ordering these two, hopefully I didn't make the wrong decision.


>  
> (Sorry if I haven't been paying attention to OP's set up)

Me neither, "raid" just leapt out of the post!


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