ZFS performance help sought

[William A. Mahaffey III]

On 01/21/16 18:18, Mason Loring Bliss wrote:
> The disks in question:
>
> ada0: <ST500DM002-1BD142 KC43> ATA8-ACS SATA 3.x device
> ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada1: <WDC WD5000AAKX-22ERMA0 17.01H17> ATA8-ACS SATA 3.x device
> ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada2: <Hitachi HDS721010KLA330 GKAOA9DA> ATA-7 SATA 2.x device
> ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> ada3: <WDC WD10EZEX-00BN5A0 01.01A01> ACS-2 ATA SATA 3.x device
> ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)


Hmmmm .... 3 different brands, 4 different models, & 1 looks like a 
SATA2, while the rest are SATA3 .... I have always heard that is a 
recipe for problems/slow IO/bad performance/etc.


-- 

	William A. Mahaffey III

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