Date: Tue, 19 Jan 2010 20:09:58 +0100 From: Erik Stian Tefre <erik@tefre.com> To: =?ISO-8859-1?Q?Morgan_Wesstr=F6m?= <freebsd-questions@pp.dyndns.biz> Cc: freebsd-stable@freebsd.org Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues Message-ID: <4B560386.8060007@tefre.com> In-Reply-To: <4B557B5A.8040902@pp.dyndns.biz> References: <4B54C100.9080906@mail.zedat.fu-berlin.de> <4B54C5EE.5070305@pp.dyndns.biz> <201001191250.23625.doconnor@gsoft.com.au> <7346c5c61001181841j3653a7c3m32bc033c8c146a92@mail.gmail.com> <4B557B5A.8040902@pp.dyndns.biz>
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Morgan Wesström wrote:
> Garrett Moore wrote:
>> The drives being discussed in my related thread (regarding poor performance)
>> are all WD Green drives. I have used wdidle3 to set all of my drive timeouts
>> to 5 minutes. I'll see what sort of difference this makes for performance.
>>
>> Even if it makes no difference to performance, thank you for pointing it out
>> -- my drives have less than 2,000 hours on them and were all over 90,000
>> load cycles due to this moronic factory setting. Since changing the timeout,
>> they haven't parked (which is what I would expect).
>>
>
> You're welcome. I just feel as bad for you as for everyone else who has
> bought these obviously Windoze optimized harddrives. Unfortunately
> neither wdidle3 nor an updated firmware is available or functioning on
> the latest models in the Green series. At least that's what I've read
> from other people having this issue. WD only claims they don't support
> Linux and they probably have never heard of FreeBSD.
>
> If anyone successfully has fixed their WD15EADS drives this way I'd be
> interested in hearing from you. One of my drives has 216,000 load cycles
> accumulated over 8 months. That's one every 2nd minute... and I was hit
> by the Seagate 7200.11 fiasco too. Running on Samsungs now :-)
Keeping this python script running prevents Load_Cycle_Count from
incrementing on my WD15EADS drives by forcing a write every 5 seconds (2
drive zfs mirror pool, average of 2 load cycles per minute when the
script is not running):
import time,os
mypool = "/zfspool"
# ^^ Change to your pool!
fname = os.path.join(mypool, "wd_green_anti_idle.pyfile")
c = 0
f = open(fname, "w")
while True:
if c == 100:
f.close()
f = open(fname, "w")
c = 0
c += 1
time.sleep(5)
f.write("a")
f.flush()
os.fsync(f.fileno())
--
Erik
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