[ale] SATA PCI card or external USB enclosures?

[Matt Hessel]

Actually the USB protocol can be limiting as well.

Check the USB card for UASP compatibility if you get one as well as the
chassis.

UASP allows for multiple requests to be issued in parallel over USB 3.0. -
Otherwise it will only use serial requests and never come close to using
the bandwidth available.
On Mar 4, 2013 4:32 PM, "Ron Frazier (ALE)" <
atllinuxenthinfo at techstarship.com> wrote:

>
>
> Alex Carver <agcarver+ale at acarver.net> wrote:
>
> >On 3/4/2013 12:45, Ron Frazier (ALE) wrote:
> >>
> >>
> >> Calvin Harrigan <charriglists at bellsouth.net> wrote:
> >>
> >>> On 3/4/2013 3:04 PM, Ron Frazier (ALE) wrote:
> >>>> I don't have any experience with PCI cards for this.  For
> >enclosures,
> >>> I
> >>>> like the Vantec brand.  Quality seems to be good.  Some of them
> >have
> >>>> fans for cooling.
> >>>>
> >>>> Ron
> >>>>
> >>>> On 3/3/2013 2:47 PM, Alex Carver wrote:
> >>>>> Anyone have a suggestion for a good but not too expensive SATA PCI
> >>>>> (not express) card and/or external USB-SATA enclosure?  The
> >>> enclosure
> >>>>> for my backup drive just died (the drive seems fine...I hope).  I
> >>> just
> >>>>> need to pop it into a new box or just slip another card into the
> >>> case
> >>>>> (mobo has only IDE, no SATA).
> >>> +1 for Vantec
> >>> I have several, all several years old, none have failed to date.
> >>>
> >>
> >> Another PS.  If you use a sata-usb enclosure, you can connect via
> >usb.  No PCI card needed.
> >>
> >
> >I know, the Bytecc was a combo USB/SATA box.  But I was pondering the
> >speed boost by going for SATA and moving the drive inside the machine.
> >I'm still pondering the choice though I may just go with the external
> >USB for simplicity.  The reason for the PCI card is because I have no
> >SATA on my system so I would have to add on.
> >
>
> Hi Alex,
>
> The fastest transfer I've gotten on an external USB2 interface is about 30
> - 35 MBps.  According to
>
> http://en.wikipedia.org/wiki/Universal_Serial_Bus
>
> The effective throughput for USB2 is 35 MBps.  In this case, the bus is
> being saturated.
>
> With USB3, you get a throughput of 625 MBps on the interface according to
> the same article.
>
> According to this article on SATA
>
> http://en.wikipedia.org/wiki/Sata
>
> With SATA2, you get 300 MBps and with SATA3, you get 600 MBps.
>
> HOWEVER, the drive is going to be your limiting factor.  I have SATA2
> ports in my desktop machine and SATA spinning hard drives.  The fastest
> drive to drive transfer I've ever gotten is in the 75 MBps range.  So, with
> a spinning HDD, you could probably double your transfer speed by going to
> internal or external SATA or USB3.  If you had an SSD, which, choosing one
> at random from a magazine I have, reports read and write speeds in the 500
> MBps range, you could saturate a SATA2 bus and come close to saturating a
> SATA3 or USB3 bus.
>
> Sincerely,
>
> Ron
>
>
>
>
> --
>
> Sent from my Android Acer A500 tablet with bluetooth keyboard and K-9 Mail.
> Please excuse my potential brevity if I'm typing on the touch screen.
>
> (PS - If you email me and don't get a quick response, you might want to
> call on the phone.  I get about 300 emails per day from alternate energy
> mailing lists and such.  I don't always see new email messages very
> quickly.)
>
> Ron Frazier
> 770-205-9422 (O)   Leave a message.
> linuxdude AT techstarship.com
>
>
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