On 02/01/2013 01:16 PM, Roman Mamedov wrote: > On Fri, 01 Feb 2013 12:50:45 -0500 > Phil Turmel <philip@xxxxxxxxxx> wrote: > >> On 02/01/2013 12:17 PM, Dominique wrote: >>> Hi list, >>> >>> I was wondering what would be the best way to convert a 6 hdd raid 5 to >>> raid 6. Ideally without having to reformat everything and lose all the >>> data in the process. I have backups of the data but I don't look forward >>> reinstalling everything on that server. > > ... > >> 3) Convert array to raid6 w/ "mdadm --grow --level=raid6" > > --layout=preserve will make it an order of magnitude faster. Read "man mdadm" > for more details. (And "man md" to learn about things in general.) But will leave the array "unbalanced"--the 7th drive will never be used for reads in normal (non-degraded) operation--reducing read performance. > That's all while still assuming you *can* or want to add a 7th drive. > If not, things become more complex. Indeed. Phil -- 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
