Thanks for everyones replies.. that's given me a real feel for how its being used by you guys.. I've gone through a week of discovery and should the need arise i will certainly look into it even more.. hopefully i've gone far enough that for the near future *touch wood* i'll be at that "it just works" stage, and the next linux learning step can be mine to frustrate me :) Having had problems with the device i will be testing it a lot over the next few days/weeks.. i'm comforted by the array staying up in the event of a drive failure.. I'm a little worried that I am not going to spot a drive fail.. I guess thats what the mdadm monitor stuff is for!?!? if i run this once will it work forever or just until i power down?! Its also reassuring that during my wrestling with the corruption problems i was having i discovered that whilst not ideal you can mount the constituent mirror raid drives seperately and deal with them... this perhaps gives me something that i can fall back on although the normal array should be online anyways so its kind of redundant.. if need be i can make a backup of my backup of those ULTRA important files before attempting to rebuild the array... Thanks again... The only thing that i was kind of justifying paying £100 and above on for the 3ware cards was that it claimed to be able to get SMART info off my hdds.. i don't know if the promise ultra 100 ATA controller does this.. and i'm not sure how you get SMART/temperature information out of drives in linux anyways.. I will go searching for that... with a new case ordered though my backup machine should be sufficiently cooled Cheers Jim - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html