immense delayed write to file system (ZFS and UFS2),
performance issues
Jeremy Chadwick
freebsd at jdc.parodius.com
Tue Jan 19 11:24:51 UTC 2010
On Tue, Jan 19, 2010 at 11:07:24AM +0100, Gerrit Kühn wrote:
> On Tue, 19 Jan 2010 01:57:36 -0800 Jeremy Chadwick
> <freebsd at jdc.parodius.com> wrote about Re: immense delayed write to file
> system (ZFS and UFS2), performance issues:
>
> JC> If you want a consumer-edition drive that's better tuned for server
> JC> work, you should really be looking at the WD Caviar Black series or
> JC> their RE/RE2 series.
>
> That's exactly what I did. I have WD-RE2 drives here that show exactly
> this problem (RE2/GP)! The model number is WD1000FYPS-01ZKB0.
I should have been more specific. WD makes RE-series drives which don't
have GP applied to them; those are what I was referring to.
Here's the current list of Western Digital SATA models out there, sans
some earlier revisions. All below drives are 3.5", SATA300, and have
their SATA power/signal ports placed to permit hot-swapping in drive
carriers unless otherwise noted.
Enterprise high-performance class
===================================
WD3000GLFS - WD VelociRatpor, 300GB, 16MB, 10Krpm, no-hotswap
WD1500HLFS - WD VelociRaptor, 150GB, 16MB, 10Krpm
WD3000HLFS - WD VelociRaptor, 300GB, 16MB, 10Krpm
WD1500BLFS - WD VelociRaptor, 150GB, 16MB, 10Krpm, 2.5" bare
WD3000BLFS - WD VelociRaptor, 300GB, 16MB, 10Krpm, 2.5" bare
Enterprise business-critical class
====================================
WD2502ABYS - WD RE3, 250GB, 16MB, 7200rpm
WD3202ABYS - WD RE3, 320GB, 16MB, 7200rpm
WD5002ABYS - WD RE3, 500GB, 16MB, 7200rpm
WD1002FBYS - WD RE3, 1TB, 32MB, 7200rpm
WD7502ABYS - WD RE3, 750GB, 32MB, 7200rpm
WD2003FYYS - WD RE4, 2TB, 64MB, 7200rpm
Enterprise energy-saving class
================================
WD5000ABPS - WD RE2-GP, 500GB, 16MB, variable rpm
WD7500AYPS - WD RE2-GP, 750GB, 16MB, variable rpm
WD1000FYPS - WD RE2-GP, 1TB, 16MB, variable rpm
WD2002FYPS - WD RE4-GP, 2TB, 64MB, variable rpm
Desktop class
===============
WD800AAJS - WD Caviar Blue, 80GB, 8MB, 7200rpm
WD1600AAJS - WD Caviar Blue, 160GB, 8MB, 7200rpm
WD2500AAJS - WD Caviar Blue, 250GB, 8MB, 7200rpm
WD3200AAJS - WD Caviar Blue, 320GB, 8MB, 7200rpm
WD2500AAKS - WD Caviar Blue, 250GB, 16MB, 7200rpm
WD3200AAKS - WD Caviar Blue, 320GB, 16MB, 7200rpm
WD5000AAKS - WD Caviar Blue, 500GB, 16MB, 7200rpm
WD6400AAKS - WD Caviar Blue, 640GB, 16MB, 7200rpm
WD5000AACS - WD Caviar Green, 500GB, 16MB, variable rpm
WD6400AACS - WD Caviar Green, 640GB, 16MB, variable rpm
WD7500AACS - WD Caviar Green, 750GB, 16MB, variable rpm
WD10EACS - WD Caviar Green, 1TB, 16MB, variable rpm
WD5000AADS - WD Caviar Green, 500GB, 32MB, variable rpm
WD6400AADS - WD Caviar Green, 640GB, 32MB, variable rpm
WD7500AADS - WD Caviar Green, 750GB, 32MB, variable rpm
WD10EADS - WD Caviar Green, 1TB, 32MB, variable rpm
WD15EADS - WD Caviar Green, 1.5TB, 32MB, variable rpm
WD20EADS - WD Caviar Green, 2TB, 32MB, variable rpm
WD6400AARS - WD Caviar Green, 640GB, 64MB, variable rpm
WD8000AARS - WD Caviar Green, 800GB, 64MB, variable rpm
WD10EARS - WD Caviar Green, 1TB, 64MB, variable rpm
WD15EARS - WD Caviar Green, 1.5TB, 64MB, variable rpm
WD20EARS - WD Caviar Green, 2TB, 64MB, variable rpm
WD5001AALS - WD Caviar Black, 500GB, 32MB, 7200rpm
WD6401AALS - WD Caviar Black, 640GB, 32MB, 7200rpm
WD7501AALS - WD Caviar Black, 750GB, 32MB, 7200rpm
WD1001FALS - WD Caviar Black, 1TB, 32MB, 7200rpm
WD2001FAAS - WD Caviar Black, 2TB, 64MB, 7200rpm
So which drive models above are experiencing a continual increase in
SMART attribute 193 (Load Cycle Count)? My guess is that some of the WD
Caviar Green models, and possibly all of the RE2-GP and RE4-GP models
are experiencing this problem.
I say "some" with regards to WD Caviar Green since I have some which do
not appear to exhibit the heads/actuator arm moved into the landing/park
zone. I'm at work right now, but when I get home I can verify what
models I've used which didn't experience this problem, as well as what
the manufacturing date and F/W revisions are. I should note I don't
have said Green drives in use (I use WD1001FALS drives now).
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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