immense delayed write to file system (ZFS and UFS2),
gerrit at pmp.uni-hannover.de
Tue Jan 19 12:48:31 UTC 2010
On Tue, 19 Jan 2010 03:24:49 -0800 Jeremy Chadwick
<freebsd at jdc.parodius.com> wrote about Re: immense delayed write to file
system (ZFS and UFS2), performance issues:
JC> > JC> If you want a consumer-edition drive that's better tuned for
JC> > JC> server work, you should really be looking at the WD Caviar Black
JC> > JC> series or their RE/RE2 series.
JC> > That's exactly what I did. I have WD-RE2 drives here that show
JC> > exactly this problem (RE2/GP)! The model number is WD1000FYPS-01ZKB0.
JC> I should have been more specific. WD makes RE-series drives which
JC> don't have GP applied to them; those are what I was referring to.
Well, when I bought these drives I was not aware of this issue. Buying a
drive intended for 24/7 use in RAID configurations is basically the right
idea, I think. From what was written about the GP feature back then I
could not anticipate such problems.
I would have liked to buy the 2TB drives without GP lately, but they have
lead times into April here. So I went for the GP model, which now shows
the same problem as the 1TB drive... :-(
JC> WD1000FYPS - WD RE2-GP, 1TB, 16MB, variable rpm
JC> WD2002FYPS - WD RE4-GP, 2TB, 64MB, variable rpm
JC> So which drive models above are experiencing a continual increase in
JC> SMART attribute 193 (Load Cycle Count)? My guess is that some of the
JC> WD Caviar Green models, and possibly all of the RE2-GP and RE4-GP
JC> models are experiencing this problem.
I can confirm that the two models above show this problem.
Furthermore I can confirm that at least in my setup here this drive
type works fine:
I have some of the RE3 drives sitting around here and will probably try
Can anyone here report anything about the fixed firmware from
Does this remedy the problem for the 1TB RE2 drive?
JC> I say "some" with regards to WD Caviar Green since I have some which do
JC> not appear to exhibit the heads/actuator arm moved into the
JC> landing/park zone. I'm at work right now, but when I get home I can
JC> verify what models I've used which didn't experience this problem, as
JC> well as what the manufacturing date and F/W revisions are. I should
JC> note I don't have said Green drives in use (I use WD1001FALS drives
Thanks for sharing this information.
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