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Date: Mon, 27 Jul 2009 11:42:38 -0700
Message-ID: <b79f23070907271142m1f922c7dua5bd3cc6d9b6fd5c@mail.gmail.com>
Subject: Re: [gentoo-user] {OT} SSD instead of RAID1?
From: James Ausmus <james.ausmus@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Mon, Jul 27, 2009 at 10:43 AM, Florian Philipp <
lists@f_philipp.fastmail.net> wrote:
> Grant schrieb:
>
<snip>
> >> You don't need to buy SSD "drives" - instead you could use CF cards and
> a
> >> cheap adaptor. These are commensurate in capacity & cost with USB flash
> >> drives (4gig, maybe 16gig?), but CF cards "talk EIDE" and you can get
> cheap
> >> pin-convertors allowing you to connect them to EIDE cables and treat
> them
> >> like a hard-drive.
> >
> > Aren't CF cards much slower than SSD drives and HD drives?
> >
>
<snip>
>
> If you really need to write to the CFDisk, make sure to buy one with DMA
> support (and no, the label "super fast" which is regularly found on
> these things does not necessarily mean that it supports DMA).
One thing to watch out for if you do go the CF/DMA route - be careful what
CF<->IDE/SATA adapter you buy - in an embedded control system project I
worked on a few years ago, we went CF + adapter for the primary OS driver,
got a super-fast 4GB CF card, and couldn't use the speed of it at all,
because the cheapo CF adapter we got was so electrically noisy across the
physical adapter pins, that DMA reads/writes would fail, and the speed would
get auto-reduced to PIO. Very, very, very annoying. If you get a CF adapter,
make sure to spend the extra $5-20 (or however much, I haven't priced in
quite a while) to get something that will be compatible with the transfer
speeds that you are wanting to use.
-James
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<br><br><div class=3D"gmail_quote">On Mon, Jul 27, 2009 at 10:43 AM, Floria=
n Philipp <span dir=3D"ltr"><<a href=3D"mailto:lists@f_philipp.fastmail.=
net">lists@f_philipp.fastmail.net</a>></span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204); margi=
n: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Grant schrieb:<br>
<div class=3D"im"></div></blockquote><div class=3D"im">=A0<br><snip><=
/div><div>=A0</div><blockquote class=3D"gmail_quote" style=3D"border-left: =
1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;=
"><div class=3D"im">
>> You don't need to buy SSD "drives" - instead you cou=
ld use CF cards and a<br>
>> cheap adaptor. These are commensurate in capacity & cost with =
USB flash<br>
>> drives (4gig, maybe 16gig?), but CF cards "talk EIDE" an=
d you can get cheap<br>
>> pin-convertors allowing you to connect them to EIDE cables and tre=
at them<br>
>> like a hard-drive.<br>
><br>
> Aren't CF cards much slower than SSD drives and HD drives?<br>
></div></blockquote><div>=A0</div><div><snip><br>=A0</div><blockqu=
ote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204=
); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class=3D"im"><br></d=
iv>
If you really need to write to the CFDisk, make sure to buy one with DMA<br=
>
support (and no, the label "super fast" which is regularly found =
on<br>
these things does not necessarily mean that it supports DMA).</blockquote><=
div><br>One thing to watch out for if you do go the CF/DMA route - be caref=
ul what CF<->IDE/SATA adapter you buy - in an embedded control system=
project I worked on a few years ago, we went CF + adapter for the primary =
OS driver, got a super-fast 4GB CF card, and couldn't use the speed of =
it at all, because the cheapo CF adapter we got was so electrically noisy a=
cross the physical adapter pins, that DMA reads/writes would fail, and the =
speed would get auto-reduced to PIO. Very, very, very annoying. If you get =
a CF adapter, make sure to spend the extra $5-20 (or however much, I haven&=
#39;t priced in quite a while) to get something that will be compatible wit=
h the transfer speeds that you are wanting to use.<br>
<br></div></div>-James<br>
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