Date: Tue, 19 Jan 2010 19:57:22 +0100 From: Oliver Lehmann <lehmann@ans-netz.de> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues Message-ID: <20100119195722.ee6e799b.lehmann@ans-netz.de> In-Reply-To: <20100119112449.GA73052@icarus.home.lan> 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> <20100119095736.GA71824@icarus.home.lan> <20100119110724.ec01a3ed.gerrit@pmp.uni-hannover.de> <20100119112449.GA73052@icarus.home.lan>
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Hi,
it seems that I'm not experiencing this at all...
Jeremy Chadwick wrote:
> WD10EACS - WD Caviar Green, 1TB, 16MB, variable rpm
have one (external HDD, "always" powered on)
Model = WDC WD10EAVS-00D7B1
Firmware Version = 01.01A01
Power_On_Hours 5757
Power_Cycle_Count 75
Load_Cycle_Count 127
> WD10EADS - WD Caviar Green, 1TB, 32MB, variable rpm
have four, got them in Sep/09.
one is RMAed right now because it had defective sectors in Dec/09 (surprisingly
the first WDC I encountered problems so far).
All four are used as a RAID-5 configured with my 3ware 9500-4LP. I don't know
if the controller requests data from the drives in a very short period of time.
I'm MRTGing some SMART attributes which should at least query the drive every
minute. The ata idle feature is not supported at all trough the 3ware
controllers.
For the remaining 3 drives:
Model = WDC WD10EADS-00L5B1
Firmware Version = 01.01A01
Power_On_Hours 2538
Power_Cycle_Count 140
Load_Cycle_Count 141
Power_On_Hours 2526
Power_Cycle_Count 133
Load_Cycle_Count 134
Power_On_Hours 2490
Power_Cycle_Count 126
Load_Cycle_Count 128
So - I'm not experiencing this problem at all but I "feel" that the
drives are reacting more slowly than my previous WD2500KS-00MJB0 are.
changing a directory and then typing ls takes some time until the result
is displayed... I can live with that but it doesn't feel "good"
And - it is not really something I would call "fast" - but it saves
power :)
The 3ware RAID-5 over 4 disks (using the EAVS from above as replacement
right now until WDC sends a new drive back):
Version 1.96 ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
nudel.salatschue 6G 89 99 76321 38 29285 21 249 99 111225 33 201.7 13
Latency 106ms 247ms 1155ms 63744us 145ms 382ms
Version 1.96 ------Sequential Create------ --------Random Create--------
nudel.salatschuesse -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 571 6 +++++ +++ 1095 8 617 6 +++++ +++ 611 5
Latency 523ms 61us 125ms 103ms 87us 159ms
--
Oliver Lehmann
http://www.pofo.de/
http://wishlist.ans-netz.de/
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