Re: PCI Express 2.0 SATA 3 host bus adapter
On 07/12/13 03:10, Stan Hoeppner wrote:
Stan - I assume you mean the Adaptec 6405E:
It's the best little SOHO RAID card for the money IMO, and the most
flexible WRT PCIe slots,
Okay.
eats a $50 port that can be part of a RAID set. You can attach that SSD
to a free mobo SATA port and use cleancache with similar benefit,
I was wondering if Linux had SSD caching...
Consumer grade SATA is fine, especially if using software RAID. Or if
using a RAID card that supports such drives.
Okay.
It's odd to see you inquire about using SAS drives that run $300 each,
then ask for a cheap HBA solution.
We started around the $200 mark and the discussion when up from there.
I wanted to find out what people think of cheaper solutions.
http://www.newegg.com/Product/Product.aspx?Item=N82E16815124027
Then buy a 2nd one later when you get up to 3/4 drives and implement
md/RAID. You'll have invested less than $12/port. Sil 3132 has
universal Linux distro compatibility, and enough bus throughput for 2
rusty drives, ~125MB/s per drive.
Okay.
$50 is ridiculously high for a cheap 2 port SATA HBA. Siig is no better
quality than Syba, Koutech, etc. They all buy the same boards from the
same Chinese manufacturers and slap their sticker on em.
Interesting.
SATA3 is good for 600MB/s simplex, 1.2GB/s duplex. This is a PCIe 2.0
x1 card. This bus supports 500MB/s simplex, 1GB/s duplex. One of its
two SATA ports can saturate the PCIe bus. You're better off with a
cheaper PCIe 2.0 x1 SATA2 card, whose two SATA ports combined just
barely saturate the PCIe bus.
So, the primary benefit to SATA3 ports vs. SATA2 ports with SATA3 HDD's
would be frequent small writes (that fit within the HDD caches) (?).
Note: unless you plan on connecting a couple of SF22xx series SSDs
there's no need for SATA3. If you do plan on this you need an x4 PCIe
slot.
Okay.
http://www.promise.com/storage/raid_series.aspx?region=en-US&m=572&rsn1=5&rsn3=9
The low range of the TX4 series are all PCIe 1.0 x1, even the 4 port
model. With that one you're limited to 60MB/s per SATA port. If you
step up to the higher end of the range the boards are x4 and x8, and the
price is similar to an Adeptec or LSI, which are both much better cards.
Okay.
David
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