Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi,
I have looked up other postings, but didn't find anything which could help me.
Host:
-----
IBM System x3550
RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02) using Kernelmodul: aacraid
Replicated Storage size is 112Gb
1000Mbit/s network
Kernel: 2.6.18-92.1.13.el5xen
-----------------------------
kernel-xen-2.6.18-92.1.13.el5
DRBD: 8.2.6 (Config file is attached)
-----------
drbd82-8.2.6-1.el5.centos
kmod-drbd82-xen-8.2.6-1.2.6.18_92.1.10.el5
Performance:
------------
=== nc over crosslink ===
<pre>
# dd if=/dev/zero bs=1M count=2000 | nc 192.168.222.29 10000
2000+0 records in
2000+0 records out
2097152000 bytes (2.1 GB) copied, 17.8035 seconds, 118 MB/s
</pre>
Nice Performance.
=== local Test ===
<pre>
# bonnie++ -d /home -s 10000 -r 4000 -u root
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
syphilis1.fr 10000M 71351 94 102861 19 59725 3 84161 86 153445 1 600.6 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
syphilis1.fra,10000M,71351,94,102861,19,59725,3,84161,86,153445,1,600.6,0,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
</pre>
Nice local performance on non drbd partition
=== Test only with one node, standalone ===
<pre>
# bonnie++ -d /data1 -s 10000 -r 4000 -u root
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
syphilis1.fr 10000M 8601 10 8303 1 9849 0 86958 91 160382 2 51.4 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
syphilis1.fra,10000M,8601,10,8303,1,9849,0,86958,91,160382,2,51.4,0,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
</pre>
Already here the performance is under 10MB/s for block writes. There isn't any traffic on the network card. The second host is not connected.
=== Test with both nodes connected ===
<pre>
# bonnie++ -d /data1 -s 10000 -r 4000 -u root
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
syphilis1.fr 10000M 8400 9 8595 1 10035 0 79904 84 156880 2 63.0 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ 16780 18
syphilis1.fra,10000M,8400,9,8595,1,10035,0,79904,84,156880,2,63.0,0,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,16780,18
</pre>
the performance is under 10MB/s for block writes, and the second node is connected now.
A sync runs with around:
[>....................] sync'ed: 3.6% (9784/10140)M
finish: 0:06:20 speed: 26,296 (22,792) K/sec
What could cause this behavior? How can I get a better performance?
I have a drbd compiled by myself on the same hardware with my own Kernel under FC7 and it runs with around 50 MB/s. In CentOS it's very sloooow... ;o)
In other postings I have seen that it works with CentOS5, but not my setup.
Thanks,
Achim
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