Date: Sun, 16 Nov 2014 14:25:51 -0500 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: Darren Pilgrim <list_freebsd@bluerosetech.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: OT-ish SATA port replicators vs. SAS "expanders" Message-ID: <CACpH0MdejdpsNW=CwutjvZfyM%2BSdB5fBBzu7WAdT55mD1pdG_A@mail.gmail.com> In-Reply-To: <54680726.1010708@bluerosetech.com> References: <CACpH0Me7Y%2Bm6cENsg2otcP9agDp%2BwKPGnPxDafFfySPNkhsKBA@mail.gmail.com> <54680726.1010708@bluerosetech.com>
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On Sat, Nov 15, 2014 at 9:08 PM, Darren Pilgrim < list_freebsd@bluerosetech.com> wrote: > A SATA port replicator (or port multiplier) is more like a USB hub: you > plug the replicator into a host SATA port and it provides more than one > SATA port for devices. I've yet to see one without interoperability > problems. They also add a big risk: if one of the devices on a replicator > has a problem, the host can't reset individual replicated ports--just the > host port. > > I have used the Mediasonic 'Probox' 4 drive eSATA for some years. I have 6 of them now. If you were running a standard RAID, you'd have the problem that one drive can take down the array and that you'd have huge trouble recovering. However, ZFS handles this well...
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