Hello, i'm trying to speed up big btrfs volumes. Some facts: - Kernel will be 4.13-rc7 - needed volume size is 60TB Currently without any ssds i get the best speed with: - 4x HW Raid 5 with 1GB controller memory of 4TB 3,5" devices and using btrfs as raid 0 for data and metadata on top of those 4 raid 5. I can live with a data loss every now and and than ;-) so a raid 0 on top of the 4x radi5 is acceptable for me. Currently the write speed is not as good as i would like - especially for random 8k-16k I/O. My current idea is to use a pcie flash card with bcache on top of each raid 5. Is this something which makes sense to speed up the write speed. Greets, Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
