Hi all, I got a little confused about the various chunk/stripe sizes when using mdadm in combination with LVM. I searched the mailing list archives and googled it but couldn't really find a definite answer to my question. I'm searching for the most optimal chunk/stripe sizes using mdadm and LVM. Here's an example setup: I created 2 md sets, both raid10 containing 8 disks with a chunk size of 512Kb This is where the confusion starts and correct me if i'm wrong here: To my knowledge I now have a stripe size of 2048Kb on each md set raid10 has 4 actual data disks (and 4 mirrors), so one stripe of data is 4x 512Kb = 2048Kb Now when using LVM: I created two PV's of both md sets and added them to one VG. Now when I create a LV and like to stripe across both PV's (md sets) what would be the ideal stripe size? 2048Kb or 4096Kb? When i read the LVM documentation about creating a striped LV, it looks like the stripe size is what mdadm calls the chunk size. Or is the stripe size the size of a total stripe across all PV's? I hope someone can clarify this for me. P.S. I'm also curious how this calculation would be if using different raid levels like raid5 or raid6 Kind regards, Caspar Smit -- 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
