Linux Software RAID
Has anyone had any bad experiences with Linux software "RAID"?I've been experimenting lately with Promise ATA-RAID (the "driver based crap) and 3ware Escalade ATA-RAID (hardware based) controllers, but the experiences have not been anything spectacular.
Promise does not deliver at all, in the sense of reliability and 3ware Escalade somehow does not perform well in speed tests, especially on the FreeBSD 4.X platform.
So as one of the alternatives we've been starting to look at Linux kernel based RAID.
My tests so far have shown no problems at all, which makes a paranoid person like me a little nervous

I'm specifically interested in problems regarding booting from a kernel RAID device and adding existing/new drives to the RAID array ( to my understanding creating a RAID device erases all data on the partitions used for it) .