I'm considering using LVM striping over several EBS volumes. So let's imagine the following case: Volume group DATA is created with 3 physical disks sdf1, sdg1 and sdh1. I create a logical volume "store" inside DATA and enable striping on this, with 3 stripes and a stripesize at 128KB so I split my blocks across the 3 physical volumes.

Now, I want to add a 4th physical volume to grow the size of the volume group and logical volume. I add my physical volume to DATA, increase the size of "store" and change the number of stripe from 3 to 4.

What happens to my "store" volume ? Do the previously existing blocks get re-organized ? Otherwise, if my 3 previous physical volumes were full, only the 4th one will be used to store the new blocks, and there would be no striping.

1 Answer 1


Do the previously existing blocks get re-organized?


What you would get is a LV that is a concatenation of two stripe sets, one 3 disks and one 4 disks.

However, if you going to extend and LV with stripes then the maximum size of the extension is N * the number of free extents on the PV with the fewest free extents where N is the number of stripes.

In your case the three current disks are full. Thus you cannot use striping at all.

  • Another issue is IOPS. The IOPS GP2 provides is barely enough, if you stripe 3 of them you'll have one 1/3 of IOPS remaining. You could switch to IO1 provisioned IOPS disks, but those are barely better than the GP2 and cost a multiple. At this point (2019) Amazon does not have any storage option that is equaly in performance as a low end computer. It is highly reliable but also very slow.
    – John
    Jan 22, 2019 at 1:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.