The first thing to note is that HBA based hardware RAID is not something anyone should enable blindly. The fusion isn't even a dedicated RAID card, so its RAID engine is effectively jammed into left over firmware space because it was available (HP, for instance, required this capability to be removed on some of the HP OEM models). Even for dedicated hardware RAID, the problem you have is that it effectively puts the onboard processor in the direct I/O path. Since cards are (reasonably) cheap, these processors don't have the fastest busses or highest processing capabilities, and often top out at surprisingly low bandwidths, especially for compute intensive transactions like RAID-5/RAID-6.
Mainly this internal sas array (2*73GB 10k sas disks) is used for operating system only. Currently I am running it on raid1
After weekend I can try to run it without hardware acceleration, it mainly makes installing operating system a bit harder. So, this looks like that I need to buy working sas raid controller, if I want to use hardware raid on this machine? Rest of data is on fibrechannel san and it is working fine. -- Eero -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
