[DRBD-user] DRBD Performance

nathan at robotics.net nathan at robotics.net
Thu Jul 31 03:41:27 CEST 2008

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, 30 Jul 2008, nathan at robotics.net wrote:

> What is the max performance anyone has seen with DRBD? With the default 
> config I am seeing 80 MB/s write and 159 MB/s read. I googled around and 
> found Florian's blog and set al-extents 3833, max-buffers 8192, 
> unplug-watermark 128 and was able to get that up to 118 MB/s write and 180 
> MB/s read.

Hate to reply to my own post, but wanted to show that I am getting 2.19 
Gbits/sec between hosts over Infiniband and reads from device DRBD is 
using is 543 MB/s.

[root at xen1 src]# iperf -c 172.16.0.220
------------------------------------------------------------
Client connecting to 172.16.0.220, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 172.16.0.221 port 33300 connected with 172.16.0.220 port 5001
[  3]  0.0-10.0 sec  2.54 GBytes  2.18 Gbits/sec

[root at xen0 src]# sync ;dd if=/dev/sdb of=/dev/null bs=4096 count=1M
1048576+0 records in
1048576+0 records out
4294967296 bytes (4.3 GB) copied, 7.91526 seconds, 543 MB/s

><>
Nathan Stratton                                CTO, BlinkMind, Inc.
nathan at robotics.net                         nathan at blinkmind.com
http://www.robotics.net                        http://www.blinkmind.com



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