[DRBD-user] write performance for DRBD devices seems to be slow

Roger Tsang perj8 at hotmail.com
Tue Jul 12 19:33:30 CEST 2005

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





More information about the drbd-user mailing list