[Ukfreebsd] "green" HDDs
aw1 at stade.co.uk
Tue Jan 11 02:53:35 GMT 2011
On Mon, Jan 10, 2011 at 11:08:54PM +0000, Tim Borgeaud wrote:
> Bruce Cran wrote:
> >On Sun, 9 Jan 2011 17:09:51 +0000
> >dgmm <freebsd01 at dgmm.net> wrote:
> >>Has anyone used these drives and have some observations on their use?
> >I've used both the WD EARS and Samsung F3 series. By default the WD
> >drives will spin down after 8 seconds which make them useless for RAID
> >but that can be disabled using a Windows utility, wdidle3.exe. Even
> >then the random access performance is very poor.
> I'm not certain about the WD EARS drives, but I suspect that the power
> saving features are similar to other Western Digital drives.
> I have a couple of Western Digital 2.5" drives, they don't spin down every
> 8 seconds, but they do park the heads after 8 seconds of inactivity.
> The wdidle3.exe tool which can change this timeout is, unfortunately, not
> approved on recent drives. It apparently does a bit more than a simple ATA
> command, it adjusts some software/firmware in the drive and was created
> for older drives. It can be found, but as far as I know, it is no longer
> available on the WD web site.
> However, I have used the ataidle utility to turn off the power management
> features on my drives and prevent the head parking (note that I think that
> ataidle doesn't work when ahci is used). The WD drives I have need the
> power management setting to be changed whenever power is cycled.
My main home server has these 1.5 TB "green" WDC drives in it:
ada1: <WDC WD15EADS-00S2B0 04.05G04> ATA-8 SATA 2.x device
ada2: <WDC WD15EADS-00S2B0 04.05G04> ATA-8 SATA 2.x device
ada3: <WDC WD15EADS-00S2B0 04.05G04> ATA-8 SATA 2.x device
ada4: <WDC WD15EADS-65P8B1 01.00A01> ATA-8 SATA 2.x device
ada5: <WDC WD15EADS-00S2B0 04.05G04> ATA-8 SATA 2.x device
ada6: <WDC WD15EADS-00S2B0 04.05G04> ATA-8 SATA 2.x device
The oddball is a replacement for one of the original which failed (and
is still awaiting my running WD diagnostics on it so that I can return
Load cycle count - had climbed to over half the lifetime rating for the
193 Load_Cycle_Count 0x0032 134 134 000 Old_age Always - 200006
before I cottoned on to the problem and started running a script which
accesses every drive every 5 seconds.
I've twice had a drive drop out of the array due to error recovery
taking too long.
The next time I build a server from scratch I'll use server grade disks.
An alcoholic is a person who drinks more than his own physician.
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