Orvar Korvar wrote: > Ive studied all links here. But I want information of the HW raid > controllers. Not about ZFS, because I have plenty of ZFS information now. The > closest thing I got was > www.baarf.org >
[one of my favorite sites ;-)] The problem is that there is no such thing as "hardware RAID" there is only "software RAID." The "HW RAID" controllers are processors running software and the features of the product are therefore limited by the software developer and processor capabilities. I goes without saying that the processors are very limited, compared to the main system CPU found on modern machines. It also goes without saying that the software (or firmware, if you prefer) is closed. Good luck cracking that nut. > Where in one article he states that "raid5 never does parity check on reads". > Ive wrote that to the Linux guys. And also "raid6 guesses when it tries to > repair some errors with a chance of corrupting more". Thats hard facts. > The high-end RAID arrays have better, more expensive processors and a larger feature set. Some even add block-level checksumming, which has led to some fascinating studies on field failures. But I think it is safe to assume that those features will not exist on the low-end systems for some time. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
