Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Try increasing your max-buffers and max-epoch-size to MAX. >To: drbd-user at lists.linbit.com >Subject: Re: [DRBD-user] write performance for DRBD devices seems to be >slow >Date: Tue, 12 Jul 2005 19:27:29 +0800 > >ok I have here added my iozone results. >I am just new to this drbd maybe a month or two. Does anyone have the >standard benchmark results for drbd or where can i find it? I am >really worried about the write performance on our drbd, the difference >is just too big and much more is if it is now under NFS and samba. > >LVM2 + XFS >File size set to 4096 KB > Record Size 4 KB > SYNC Mode. > Include fsync in write timing > Include close in write timing > Command line used: ./iozone -s4m -r4k -o -e -c > Output is in Kbytes/sec > Time Resolution = 0.000001 seconds. > Processor cache size set to 1024 Kbytes. > Processor cache line size set to 32 bytes. > File stride size set to 17 * record size. > random >random bkwd record stride > KB reclen write rewrite read reread read >write read rewrite read fwrite frewrite fread freread > 4096 4 11680 35386 1126176 1158032 926910 >34997 939673 35074 907599 64502 68108 1016369 1079917 > >LVM2 + DRBD + XFS >File size set to 4096 KB > Record Size 4 KB > SYNC Mode. > Include fsync in write timing > Include close in write timing > Command line used: ./iozone -s4m -r4k -o -e -c > Output is in Kbytes/sec > Time Resolution = 0.000001 seconds. > Processor cache size set to 1024 Kbytes. > Processor cache line size set to 32 bytes. > File stride size set to 17 * record size. > random >random bkwd record stride > KB reclen write rewrite read reread read >write read rewrite read fwrite frewrite fread freread > 4096 4 619 5138 520068 516903 460170 >2494 459762 4503 461883 10358 9790 1021212 1003702 > >thanks, warren > >On 7/8/05, Lars Ellenberg <Lars.Ellenberg at linbit.com> wrote: > > / 2005-07-07 20:18:06 +0800 > > \ Warren Beldad: > > > Hi all! > > > > > > I have are a simple results of the performance of my drbd test >machines. > > > Using the dd command, first I get the performance value of my > > > harddisk. That would be formatting the /dev/sda with XFS and then > > > mount it and then write a 1GB file (which is twice the size of my RAM) > > > into that disk with dd command on different block sizes and then read > > > back that file into the black hole. > > > time dd if=/dev/zero of=testfile.txt bs=512k count=2000 > > > time dd if=testfile.txt of=/dev/null bs=512k > > > > your benchmark is broken. > > man close > > man fsync > > no, dd does not do fsync. > > > > -- > > : Lars Ellenberg Tel +43-1-8178292-0 : > > : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : > > : Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com : > > __ > > please use the "List-Reply" function of your email client. > > _______________________________________________ > > drbd-user mailing list > > drbd-user at lists.linbit.com > > http://lists.linbit.com/mailman/listinfo/drbd-user > > >_______________________________________________ >drbd-user mailing list >drbd-user at lists.linbit.com >http://lists.linbit.com/mailman/listinfo/drbd-user