On Tuesday May 15, mangoo@xxxxxxxx wrote: > > Interesting lecture, thanks a lot. I'm gonna take that path. :-) > > I have one more question, though. > > I want to migrate: > - from 4x400GB HDD RAID-10 > - to 4x400GB HDD RAID-5 > > Obviously, I need 8 disks for that, but I have only 6. > > So my idea was to kick one disk from RAID-10, and use it for RAID-5 for > the time of migration. > > This means, I would have only 3 disks out of 4 in RAID-5 array. Yes... that would work.... How much do you trust your drives, and how much to do value your data? Presumably perceived likely hood of failure * value of data < price of 2 drives. > > > Is it possible to create a degraded, 4 disk RAID-5 array with just 3 > drives? I would add the 4th drive once migration from RAID-10 is done. Certainly. When you create the raid5, use the word "missing" in place of the drive which is ... missing. This will create a degraded array. You the drive becomes available, simply add it in to the array. If you drives are not identical (same number of sectors), make sure the last drive you add is not the smallest, else you won't be able to add it. NeilBrown - 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
