On Thu, 17 May 2012 03:24:26 +0200 Oliver Martin <oliver@xxxxxxxxxxxxxxxx> wrote: > Hi, > > is there any specific reason why md refuses to create a RAID6 array with > 3 disks? My (probably naive) understanding suggests it should be the > same as a 3-disk RAID1, similar to a 2-disk RAID5. I'll have to leave for for hpa to answer. I've occasionally thought that maybe it should be fixed, but it never seemed worth the effort. > > The reason I'm asking is that I currently have space on three disks for > a new array, and would like to expand it when I add a fourth. I tried > this scenario with a few loopback devices, but the only way to go from a > 3-disk RAID1 to a 4-disk RAID6 seems to be via an intermediate 3-disk > RAID5, requiring two reshapes. I'd like to avoid one of them, if at all > possible. Yes, not possible at present. It might be as simple and finding the places that impose the limit and delete them... NeilBrown > > Regards, > Oliver > -- > 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
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