[DRBD-user] FW: Slow sync speed over gigabit

Leroy van Logchem leroy.vanlogchem at wldelft.nl
Tue Aug 14 15:15:42 CEST 2007


> DRBD Partitions: Using a 70gb partition created by Logical Volume Manager
> OS: RHEL5
> DRBD: 8.0.5, made with 'make rpm' against RHEL kernel-source package and installed with rpm.
>         finish: 1:20:30 speed: 12,568 (11,900) K/sec
>   

# TCP adjustments for >1Gb/s
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_rmem = 4096        87380   16777216
net.ipv4.tcp_wmem = 4096        87380   16777216
net.ipv4.tcp_reordering = 100
net.core.netdev_max_backlog = 10000
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

Can you achieve full bandwidth using iperf?

DRBD doesnt limit you, we recently got the resync up to 160MB/s (sustained)
using three interfaces of our quad gigabit nic.


-- 
Leroy



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