Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Lars Ellenberg wrote: > if you cannot get more than 130 MB/sec on top of a ram disk and 10GbE, > there is something fishy going on, > and I doubt that drbd can do much about it. I don't see anything fishy here. I guess someone is confusing the _read_ speed of a device: > # hdparm -t /dev/md4 > > /dev/md4: > Timing buffered disk reads: 1102 MB in 3.01 seconds = 366.57 MB/sec > Timing buffered disk reads: 1040 MB in 3.00 seconds = 346.63 MB/sec With its _write_ speed: > [==============>.....] sync'ed: 76.4% (242356/1023804)K > finish: 0:00:01 speed: 130,240 (130,240) K/sec How fast can you write on that RAID-6 device (with DRBD sync to the other node disabled)? i.e., do: # sync # time dd if=/dev/zero of=/mnt/mountpint/bigfile bs=64k count=100000 # time sync Also, looking at "iostat -d 1 -k" output in the other terminal while the writes are going would be interesting. -- Tomasz Chmielewski http://wpkg.org