felixarbach at yahoo
Nov 18, 2009, 11:09 AM
Post #1 of 1
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Slow write performance with 10 Gig Ethernet
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Hi,
i have two identical servers equipped with 10 GigE cards. MTU is set to 9000 and with iperf i got over 9 Gbit/s over my network connection. The servers are directly connected. The disks (10x 2 TB SATA, RAID 6) are quite fast. I got about 700 MB/s write speed with drbd standalone. With drbd connected the write speed drops to about 150 MB/s. The sync-rate is at about 290 MB/s. Why is my write speed so slow?
Here is my drbd.conf:
global {
usage-count no;
}
common {
protocol A;
syncer { rate 900M; al-extents 3833; }
net { max-buffers 8192; }
}
resource r0 {
on brick1.myserver.com {
device /dev/drbd0;
disk /dev/sdb1;
address 10.22.23.10:7789;
flexible-meta-disk /dev/sdc1;
}
on brick2.myserver.com {
device /dev/drbd0;
disk /dev/sdc1;
address 10.22.23.11:7789;
flexible-meta-disk /dev/sdb1;
}
}
Any ideas? Thanks for your help!
Best regards,
Felix
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