On Wed, Dec 23, 2009 at 10:45 PM, Neil Brown <neilb@xxxxxxx> wrote: > On Wed, 23 Dec 2009 13:52:54 +0000 > Kristleifur Daðason <kristleifur@xxxxxxxxx> wrote: > >> Hi, >> >> I'm running a raid0 array over a couple of raid6 arrays. I had planned >> on growing the arrays in time, and now turns out to be the time. >> >> To my chagrin, searches indicate that raid0 isn't growable. Can anyone >> confirm this before I wipe and reconfigure? > > That is correct, you cannot currently grow md/raid0. > > If the two raid6 arrays are exactly the same size, then you > could grow the two raid6 arrays, create a new raid0 over them > with the same block size and all your data will still be there. > But if they are not the same size, that won't work. > > NeilBrown > Many thanks for the reply. (Re-cc'd to the linux-raid list. Hope that's OK.) 1. The raid6 arrays are exactly alike. Do I just do a create a new raid0 with the right size, device count and chunk-size parameters? I trust your advice, but I am also certain of my own foolishness. I can't fully picture what happens to the data on the array -- Specifically, I'm thinking about whether to use --assume-clean or not. The documentation says not. I am guessing that a newly-created raid0 doesn't do any syncing/resyncing anyway - it just sets up the array structure and metadata and I am left to my own devices to fill it with data. Current chunksize is 256 and metadata is 1.1. So it's just a "mdadm --create /dev/md_bigraid0 --level=0 --raid-devices=2 --metadata=1.1 --chunksize=256 /dev/md_raid6a /dev/md_raid6b", right? 2. I have a JFS filesystem on the big raid0. Once I have the bigger raid0 built, I assume that I would first do a read-only fsck.jfs, which will succeed if I did everything correctly. Then I do a remount with the "resize" option to JFS to finally grow the JFS filesystem. -- Sincere thanks. I hope I shall be able to contribute something meaningful to mdadm when the company is richer and my time is freer :) In the meantime, is there any preferred way of donating to mdadm or sponsoring it? -- Kristleifur -- 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
