On Mon, 28 Jul 2014 15:51:57 +0200 (CEST) Mikael Abrahamsson <swmike@xxxxxxxxx> wrote: > > Hi, > > I just had a thought, now that we're seeing much larger drives becoming > available, like 6TB-drives, it would be nice if it was possible to take an > array consisting of 2TB-drives, replace a few of them with 6TB-drives > (with want-replace) and then tell MD to restripe the entire array onto > these fewer larger drives. > > Concrete example: > > 10 bays, currently RAID6 in 9 disks + 1 spare, all disks 2TB ones. > > If I took out the spare and replaced it with a 6TB drive and one by one, > did want-replace so 5 of the drives were 6TB drives, I now potentially > have the space to keep the same contents on 5 6TB drives intead of 9 2TB > drives. > > If I told mdadm to reduce the number of data drives to 5, would it then > intelligently choose the 5 largest ones and keep the data area intact (or > even grow it a little), or what would it do? If this is not the case, > could this functionality needed be added to the feature request list, > whereever that list might live? > This has come up before (once I think, maybe twice - many months ago). I think I have it on a to-do list somewhere..... http://neil.brown.name/blog/20110216044002#8 Yes, it would be nice. No, it hasn't been implemented. Now, if only we could find someone keen on turning feature requests into working code.... NeilBrown
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