> I am wondering if anyone knows how to achieve good performance when > writing to a volume using cluter/replicate. I am getting write speeds of > about 4 MB/s over Gigabit Ethernet when transferring (single, large) > files to such a volume. When I remove replication, I get transfer rates > using "cp" of 21 MB/s. I can get much higher rates using "dd" with large > block sizes (at least 128KB) -- 34 MB/s for the replicated volume and > 117 MB/s without replication. Read speeds are over 100 MB/s in all > cases. The transfer rates for cp are comparable to those using dd with a > block size between 4KB and 8KB. > > I am using Gluster 2.0.0rc1 on Ubuntu 8.10 (Intrepid) systems, running > the stock 2.6.27 kernel. I have tried a range of things with the various > performance translators, but have not seen much change in performance. I > tried applying the FUSE patch, but it appears that the patch for FUSE > 2.7.3 modifies sections of the kernel module that have changed in the > 2.6.27 kernel. > > Does anyone know how I can improve the write performance in this type of > setup? Even the 21 MB/s that I get without replicate would be > acceptable, even if it's not really making use of all the available > bandwidth. > > My server and client configuration files are below. These include > cluster/distribute as well, but I don't think that has any effect when > copying a single file. We are working on replicate performance. Please check back in a couple of weeks. Avati
