linux-kernel - RE: Question regarding SAS controllers.

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Date:	Sat, 22 Nov 2008 17:43:45 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	"Moore, Eric" <Eric.Moore@....com>
cc:	"Dr. David Alan Gilbert" <linux@...blig.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Alan Piszcz <ap@...arrain.com>
Subject: RE: Question regarding SAS controllers.



On Sat, 22 Nov 2008, Justin Piszcz wrote:

>
>
> On Sat, 22 Nov 2008, Moore, Eric wrote:
>
>>> Firmware and BIOS for both Integrated RAID and Initiator-Target.  Must
>>> boot to DOS to run utility.  Batch file simplifies installation.
>>> 
>>> Welcome to LSI Logic Integrated SAS Flash Utility
>>>       This Utility will upgrade your LSI SAS3442E HBA
>>> 
>> 
>> Justin - We have linux tools for flashing firmware and bios.
>> 
>
> Eric, one final question:
> http://www.lsi.jp/storage_home/products_home/host_bus_adapters/sas_hbas/lsisas3041er/index.html
> This obviously has 4 SAS/SATA ports (regular cables) and looks like it would 
> be great in Linux/SW raid for SAS/SATA disks.
>
> This (8 port version):
> http://www.lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/lsisas3081er/index.html
> Has two SFF-8087 mini-SAS connectors.
>
> It states "two (4) x1 SATA cables"
>
> Does this mean:
>
> 8087 ------------> 8087 (with 4 lanes)
>
> Thus it would require the purchase of an additional breakout cable or 
> attachment to a special SATA/SAS enclosure.
>
> or:
>
> 8087 ------------> regular sas/sata/1
>                   regular sas/sata/2
>                   regular sas/sata/3
>                   regular sas/sata/4
>
> Justin.
>

Newegg has the answer:
http://www.newegg.com/Product/Product.aspx?Item=N82E16816118092
http://c1.neweggimages.com/NeweggImage/productimage/16-118-092-07.jpg

Follow-up:
http://www.newegg.com/Product/Product.aspx?Item=N82E16816118058
http://www.newegg.com/Product/Product.aspx?Item=N82E16816118092

How come the reviews are so bad for these cards?  (They mostly used the HW 
raid function, which I am not interested in).

Eric,

If one runs:

dd if=/dev/disk1 of=/dev/null bs=1M &

For eight disk drives on the 8-port SAS controller in an x8 or x16 slot, 
will they be able to achieve the maximum bandwidth of each drive, for 
example, velociraptor = 800MiB/s so it should 800MiB/s in aggregate reads 
(using direct-bare mode), NOT on-board raid?

Justin.
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