jim owens wrote:
Remember that the device bandwidth is the limiter so even when each host has a dedicated path to the device (as in dual port SAS or FC), that 2nd host cuts the throughput by more than 1/2 with uncoordinated seeks and transfers.
That's only a problem if there is a single shared device. Since btrfs supports multiple devices, each host could own a device set and access from other hosts would be through the owner. You would need RDMA to get reasonable performance and some kind of dual-porting to get high availability. Each host could control the allocation tree for its devices.
Of course, this doesn't solve the other problems with parallel mounts. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- 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
