On Thursday September 13, millerdc@xxxxxxxxxxxxxx wrote: > Neil, > > On RHEL5 the kernel is 2.6.18-8.1.8. On Ubuntu 7.04 the kernel is > 2.6.20-16. Someone on the Arstechnica forums wrote they see the same > thing in Debian etch running kernel 2.6.18. Below is a messages log > from the RHEL5 system. I have only included the section for creating > the RAID6, adding a spare and trying to grow it. There is a one line > error when I do the "mdadm --grow" command. It is "md: couldn't > update array info. -22." reshaping raid6 arrays was not supported until 2.6.21. So you'll need a newer kernel. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html