Am I confused about reshaping a RAID5 to RAID6 array, or is there an error in the man page? The distro I have on one of my servers - Debian "Squeeze" - employs mdadm 3.0.3, internally dated Oct. 22, 2009. The man page that comes with the software specifically says: -l, --level= <snip> Not yet supported with --grow. Searching the web, however, I find the following link from Aug. 17, 2009: http://neil.brown.name/blog/20090817000931 In the link, it says: Now, in mid 2009, we have most of the rest of the reshaping options that had been planned. These include changing the stripe size, changing the layout (i.e. where the parity blocks get stored) and reducing the number of devices. Changing the layout provides valuable functionality as it is an important part of converting a RAID5 to a RAID6. <snip> Currently supported reshapes <snip> RAID5 A RAID5 can change the number of devices, the size of the individual devices, the chunk size and the layout. A 2 drive RAID5 can be converted to RAID1, and a 3 or more drive RAID5 can be converted to RAID6. Since the 3.0.3 version of mdadm was evidently written in October, and since this link was from August, one would think 3.0.3 should be able to re-shape a RAID5 to RAID6. If so, the man page (at least for Debian "Squeeze") is incorrect, and of course fails to offer the syntax for such an upgrade. Am I missing something? -- 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
