Good morning Adam, On 10/25/2015 09:26 PM, Adam Goryachev wrote: > Hi all, > > I'm trying to convert a 4 disk RAID10 to a RAID5. Currently I have: > cat /proc/mdstat > Personalities : [raid10] > md0 : active raid10 sdd1[2] sdc1[1] sdb1[0] sde1[3] > 7813772288 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU] > bitmap: 0/59 pages [0KB], 65536KB chunk [trim /] Your plan looks reasonable, if a bit long. I've done similar before. Usually I add the new array to the LVM volume group of the original, then pvmove the contents to the new physical volume. Let's me stay online through the entire operation. Anyways, it seems you are missing an opportunity to convert in place, though. Consider setting up four small loop devices and test conversions from r10,n2 -n4 => r0 -n3 => r4 -n4 => r5 -n4 . I suspect you can get to your new raid5 without moving a bunch of data around. 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
