Date: Fri, 13 May 2016 09:55:31 -0400 From: "James B. Byrne" <byrnejb@harte-lyne.ca> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD-10.3 root ZFS Message-ID: <715faec7a2abc20924c7b2ee7ff79204.squirrel@webmail.harte-lyne.ca> In-Reply-To: <ece4a146e0eac9a7d582bf12f182cfe7.squirrel@webmail.harte-lyne.ca> References: <ece4a146e0eac9a7d582bf12f182cfe7.squirrel@webmail.harte-lyne.ca>
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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:
SATA
2x SATA 3.0 ports (6Gbps)
4x SATA 2.0 ports (3Gbps)
SCU
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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