On Mon, May 31, 2010 at 1:19 PM, Bob Friesenhahn
<bfrie...@simple.dallas.tx.us> wrote:
> I think that the problem is likely that this Western Digital drive is one of
> the new ones using 4K sectors internally. Almost everyone obtains terrible
> write performance from zfs using these drives. I suggest getting rid of it
> and replace it with a drive which still uses standard 512 byte sectors
> internally. It will be like night and day.
You can verify if this is the case by running format.
10. c2t7d0 <ATA-WDC WD10EADS-00L-1A01-931.51GB>
/p...@0,0/pci10de,3...@a/pci8086,3...@0/pci11ab,1...@4/d...@7,0
I have 1TB WD Green drives that are NOT 4k sectors, the WD10EADS. The
EADS drives have not been available for purchase since December 09 or
so. If you bought your drive this year, it's probably using 4k
sectors.
The 4k sector ("Advanced Format") are WD10EARS, WD15EARS and WD20EARS.
Someone else has posted that they got good performance with these
drives in a mirror, but not in a raidz, so mirroring two of them may
give you better performance, too.
-B
--
Brandon High : bh...@freaks.com
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