Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hallo Tomasz Tomasz Chmielewski <mangoo at wpkg.org> schrieb: > 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: Good point. > 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 # time dd if=/dev/zero of=/dev/md4 bs=64k count=100000 100000+0 Datensätze ein 100000+0 Datensätze aus 6553600000 Bytes (6,6 GB) kopiert, 25,2106 s, 260 MB/s real 0m25.213s user 0m0.020s sys 0m11.673s # dd if=/dev/zero of=/dev/md4 bs=64k count=100000 100000+0 Datensätze ein 100000+0 Datensätze aus 6553600000 Bytes (6,6 GB) kopiert, 25,5979 s, 256 MB/s # dd if=/dev/zero of=/dev/md4 bs=64k count=100000 100000+0 Datensätze ein 100000+0 Datensätze aus 6553600000 Bytes (6,6 GB) kopiert, 24,6065 s, 266 MB/s # LANG=C dd if=/dev/zero of=/dev/md4 bs=64k count=100000 100000+0 records in 100000+0 records out 6553600000 bytes (6.6 GB) copied, 25.4397 s, 258 MB/s > Also, looking at "iostat -d 1 -k" output in the other terminal while the > writes are going would be interesting. What about this results? Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sdc 601,00 220,00 22360,00 220 22360 sdd 512,00 188,00 22000,00 188 22000 sde 543,00 228,00 22252,00 228 22252 sdf 629,00 196,00 22324,00 196 22324 sdg 616,00 236,00 22364,00 236 22364 sdh 575,00 264,00 22360,00 264 22360 sdi 657,00 160,00 22360,00 160 22360 sdj 648,00 180,00 22080,00 180 22080 sdk 688,00 212,00 22360,00 212 22360 sdl 629,00 168,00 22360,00 168 22360 sdm 675,00 228,00 22028,00 228 22028 sdn 700,00 240,00 22360,00 240 22360 sdo 589,00 236,00 22356,00 236 22356 sdp 680,00 256,00 22080,00 256 22080 sdq 581,00 280,00 22360,00 280 22360 sdr 0,00 0,00 0,00 0 0 md2 0,00 0,00 0,00 0 0 md3 0,00 0,00 0,00 0 0 md4 72164,00 0,00 288656,00 0 288656 The numbers are floating between ~18900 and ~23400. Should I really mount the device with a filesystem on it? The last tests were made without a filesystem too. Lars