On Tue, 19 Jan 2010, Gerrit Kühn wrote:
On Tue, 19 Jan 2010 03:24:49 -0800 Jeremy Chadwick
<free...@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:
WD5001ABYS
I have some of the RE3 drives sitting around here and will probably try
them later.
I specifically bought RE3 drives recently because of the whole fiasco
regarding "raid compatibility". I paid about $20 each more for these in
the interest of things "just working", since I saw some debate about
whether or not the TLER setting can be flipped on the "non-RAID" drives.
FWIW, 4 1TB RE3's in a zfs raidz (an excerpt from bonnie++, block
read/write 8G on 4G RAM):
Write Read
K/sec K/sec
123207 142749
Both zfs and these drives kind of surprised me, that seems pretty good for
software raid with parity...
Seagate is currently on my blacklist after we had a large number of them
fail a year or two in the past year or two. I've had good luck so far
with WD RE2 and RE3 drives. I'll probably give seagate another shot in a
year or two.
C
Can anyone here report anything about the fixed firmware from
<http://support.wdc.com/product/download.asp?groupid=609&sid=113&lang=en>?
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
JC> now).
Thanks for sharing this information.
cu
Gerrit
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