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. It is possible, however to create ONE logical volume per ONE physical disc, and then I can use mdadm on them. But now, having seen this Adaptec software/tool to generate the hardware raid configurations (and no way around it) I started to wonder what approach is better? What do you recommend: - make one logical volume per disc and use only software raid? - use Adaptec 2405 hardware raid entirely? - or do you know some way around the hardware and access the SAS discs directly? (is that approach safe?) What has better linux support (which kernel version), other considerations, etc... thanks in advance for your help -- Janek Kozicki -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
