[DRBD-user] DRBD performance over GBit Ethernet

Holger Kiehl Holger.Kiehl at dwd.de
Wed Apr 7 17:43:52 CEST 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On Wed, 7 Apr 2004, Andreas Semt wrote:

> Lars Marowsky-Bree wrote:
> > 
> > > And: What maximum performance i can expect with such a hardware
> > > configuration (production use experience anybody)?
> > 
> > 
> > You could easily see >80MB/s. This will to a large degree depend on your
> > physical disks.
> > 
> 
> Not with my configuration :-(
> i only get:
> 
> --- snip ---
> testnode1:~# cat /proc/drbd
> version: 0.6.12 (api:64/proto:62)
> 
> 0: cs:SyncingAll st:Primary/Secondary ns:1235920 nr:0 dw:0 dr:1236060 pe:881
> ua:0
>         [>...................] sync'ed:  0.3% (96043/96256)M
>         finish: 3:47:11h speed: 7,245 (7,245) K/sec
> --- snap ---
> 
> and here my config:
> 
> --- snip ---
> testnode2:~# drbdsetup /dev/nb0 show
> Lower device: 58:03   (/dev/lvmvg/backup)
> Disk options:
> Local address: 10.1.1.2:7789
> Remote address: 10.1.1.1:7789
> Wire protocol: C
> Net options:
>  timeout = 6.0 sec
>  tl-size = 5000
>  connect-int = 10 sec
>  ping-int = 10 sec
>  sndbuf-size = 131070
>  sync-min = 40960 KB/sec
>  sync-max = 81920 KB/sec
>  sync-nice = 1
> --- snap ---
> 
> What can cause this slowly drbd performance? Any suggestions? I've used NetIO
> to get a feeling for the GBit Ethernet fitness and this brought up a rate
> (with TCP/IP) of around 100 MByte/sec. So the network works fine, i think.
> 
Are the network and disks on a 64-Bit PCI channel and are these working in
64 bit mode? 32-bit PCI bus will not manage. But even a 32 bit bus should
do more then 7MB/s, so something is wrong with your raid5 or network
card/driver. Are there any messages in /var/log/messages?

Holger



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