FreeBSD-10.3 root ZFS

James B. Byrne byrnejb at
Fri May 13 13:55:35 UTC 2016

On Fri, May 13, 2016 09:06, James B. Byrne wrote:
> I am going through an initial install using the automatic guided root
> on zfs procedure.  I have selected the 2 redundant disks raid option.
> I am at the point where I assign the disks to the zpool.  I have 8
> disks listed. These have the dev ids: ada0-ada3 and da0-da3.  The
> descriptions of the four adaX devs all begin with 'WDC WD30EFRX-...' .
> The descriptions of the four daX devs all begin with 'ATA WDC
> WD30EFRX-...'.
> What is the significance of this, if any?

Given this hardware specification for the SYS-5027R-WRF:


    2x SATA 3.0 ports (6Gbps)
    4x SATA 2.0 ports (3Gbps)


    4x SATA ports (3Gbps) via SCU

I infer that the four ada0-ada3 devices are connected via SATA
notwithstanding the IDE nomenclature used for the device names and
that the the four da0-da3 devices are connected via SAS through the
SCU given the SCSI nomenclature used for their device names.

Since the four SCU devices are 3Gbps I speculate the the four SATA
devices are also connected at 3Gbps.  So, what would the two 6Gbps
ports be used for?

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James B. Byrne                mailto:ByrneJB at
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