Re: Adaptec 2405 : hardware or software raid?

On Mon, 2009-05-25 at 17:32 +0200, Janek Kozicki wrote:

Hi,

I've bought the cheap Adaptec 2405 SAS controller for the sole
purpose of using 15k rpm HDDs. It turns out that to expose the HDDs
to the system I must first launch the computer from enclosed CD and
create some logical volumes. Those logical volumes can mix HDDs in
various raid configurations (1,0,10,5) and expose a single
device, eg. /dev/sda from multiple HDDs.

This is the first time when I see the "logical volumes" option
mandatory. I was planning to access the HDDs directly and create
software raid on them with mdadm.

This datasheet says JBOD is available (Just a Bunch of Disks - exposing
the raw disks to the OS)

http://adaptec.com/en-US/products/Controllers/Hardware/sas/entry/SAS-2405/_details/Series2_datasheet.htm?nc=/en-US/products/Controllers/Hardware/sas/entry/SAS-2405/_details/Series2_datasheet.htm

main page

http://adaptec.com/en-US/products/Controllers/Hardware/sas/entry/SAS-2405/