IInuyasha74 :
I have been told by practically everyone on this forum every time I post a question about RAID, literally dozens of users, that RAID is no backup. From my personal experience using it with two different motherboards, it has to rebuild all the time, even the smallest shut down without it expecting it and you have to wait for it to rebuild which takes forever. In addition its so slow that videos literally can pause and need to buffer while they are played off of them because the RAID is so slow. Especially if its doing anything else at the same time.
Maybe all those people have told me wrong, which is literally dozens of members who I will ask to come have a look here to correct me if I am wrong, but my first hand experience with it has been terrible.
Agreed, RAID is not backup.
Motherboard RAID is highly unreliable, as any little bios hiccup can break the array. Using a good controller, like an Adaptec 6, 7, or 8 series, I haven't had to do a rebuild in a long time and only for disk failures. I use enterprise quality disks for anything other than simple home users though.
RAID 5 gives very good read performance, although write performance is not as good (but better than RAID 6). Of course it also depends on the controller, individual disk speed, and stripe size v. data type.
My current home media server runs 8 x 3TB in RAID 6 and saturates the gigabit Ethernet easily while doing other reads, like to copy files to an SSD attached to a SATA port using an IcyDock and the last I noticed the local SSD was writing over 200MB/s from the array while the Ethernet was over 110MB/s to a HTPC with an SSD. These are large sequential files though, which are easy for all the devices. The disks are consumer quality Hitachi 7K3000 and have been running for around 3.5 years without a failure or rebuild. They are due for replacement as soon as the price on helium 6TB comes down a little more.
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