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From my research I believe the IBM M1015 flashed to be an LSI9211-IT is about the best option:
http://www.servethehome.com/ibm-serveraid-m1015-part-4/
Though I haven't done this yet myself, and I have read the M1015 can be a bit picky about motherboards when it comes to being able to flash it.
As noted above this uses the SFF-8087 style of connector.
Good luck, let us know which path you choose and how you get on.
LSI9211-IT = Straight pass through no RAID, best for ZFS file system etc
LSI9211-IR = Pass through as in IT mode, but you also have RAID options (RAID 0, RAID 1, RAID 1e and RAID 10), better for RAID 0 Windows boot SSDs etc, and possibly run Software RAID 5 on the other drives.
LSI9240 = default mode, only really useful feature this mode has is RAID1/ RAID 10, drives have to be set to JBOD (single) or RAID to be seen by OS, can be annoying when adding removing drives often.
Also, the IBM M1015 is 150$ on eBay.. that's more than I spent on the Perc 5/i with battery and RAM.
It is a RAID card untill you flash it to LSI9211-IT (all the details are in the article about the different modes you can flash it into).
Regarding costs there are certainly cheaper HBA only cards out there, though with many of them i have found mixed reports on performance and/or issues when trying to add more than 1 HBA card into a system.
If you find a good alternative I would be interested to take a look at it
My own flexraid pproject has been in the planning stages for a while, still got space on my 5TB hardware Raid5 array for now, but once that is full I'll probably be moving everything over to a new system with a much larger Flexraid T2+ or Tx storage pool. Have also been waiting for drive prices to come back down.
I read on another thread that the M1015 has become too popular (I own one too, paid less than the cables cost me), and now the H200 is suggested.
If you are happy with your setup, and have no need for greater than 2TB drives
Cheapest way out would be the Dell SAS 5/i cards on ebay
.http://forums.overclockers.com.au/showthread.php?t=879827
That way you can use your PERC cables / PCI Bracket and you know it works already in your motherboard.
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