Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
the read speed is actually higher according to hdparm: [root at box1 bonnie]# hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 17608 MB in 2.00 seconds = 8813.98 MB/sec Timing buffered disk reads: 1124 MB in 3.00 seconds = 374.38 MB/sec makes me wonder about the accuracy of Bonnie... Daniel Bourque Sr. Systems Engineer WeatherData Service Inc An Accuweather Company Tom Brown wrote: > On Tue, 21 Apr 2009, Daniel Bourque wrote: > >> Hi, >> >> My disk writes are benching 2x faster than the GigE dedicated link >> connecting the DRBD nodes. >> >> [root at host1 ]# ./Bonnie -s 1000 -d /var/tmp/ > > a 1 gig test file? That's probably a bit small. I'd guess you've got > at least a gig of memory in the system... and that might be why your > write speads are faster than your read speeds? (and why your cpu usage > is so high?) I'd make sure your benchmark is valid before you > re-engineer your network. > > obviously I'm just looking in from the outside, and maybe your test is > completely valid. but writes that are faster than reads is unusual > unless it is being cached somewhere... > > -Tom > > >> >> Bonnie 1.4: File '/var/tmp//Bonnie.9328', size: 1048576000, volumes: 1 >> Writing with putc()... done: 50862 kB/s 99.7 %CPU >> Rewriting... done: 732229 kB/s 100.0 %CPU >> Writing intelligently... done: 248780 kB/s 54.9 %CPU >> Reading with getc()... done: 43119 kB/s 99.9 %CPU >> Reading intelligently... done: 2002381 kB/s 99.9 %CPU >> >> >> Thus, the DRBD link creates a bottleneck for disk writes. I would like >> to use 802.3ad Dynamic link aggregation but looks like DRBD works off 2 >> unidirectional tcp/ip sessions, making it unable to max out the 2 >> gigE link. >> >> Does anyone have any suggestion ( other than buying a pair of 10gigE >> NICs ) ? >> >> thanks >> >> -- >> Daniel Bourque >> Sr. Systems Engineer >> WeatherData Service Inc >> An Accuweather Company >> >> >> _______________________________________________ >> drbd-user mailing list >> drbd-user at lists.linbit.com >> http://lists.linbit.com/mailman/listinfo/drbd-user >> > > ---------------------------------------------------------------------- > tbrown at BareMetal.com | Courage is doing what you're afraid to do. > http://BareMetal.com/ | There can be no courage unless you're scared. > | - Eddie Rickenbacker > > >