Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Ross S. W. Walker schrieb: >> [drbd write performance over GbE] > > First of all let me ask which benchmark tool you used for the > sequential/random io runs? I like the information it provides and > can use a tool like that. It's tiobench (http://sourceforge.net/projects/tiobench/). > Second, using Prot C, the writes do not return until they are > committed to disk on both sides, so cannot the loss of throughput be > attributed to the increased latency of writing on host1 while it > sends out the write over 1Gbps wire to host2, who then writes it to > disk and then sends a successful response back to host1 who then > returns? > > If the local write and send happened at the same time Copy/Send > Latency + Gbps latency + Remote Write Latency + Gbps return latency > = increased latency. How much increased latency depends on the > speed/effectiveness of the network and the speed of the remote > storage versus the speed of the local storage. The slowest storage > is always the weakest link, try to get storage systems that are the > same for most reliable performance. Both Raid's are able to write with >120MB/s in disconnected mode. I'm just wondering because I have seen people on the list that get ~95MB/s with a similar setup. Ralf