Hello,
I have some random network issues. This is my setup :
+----------+ +-------------+
| Internet | <+ +> | iSCSI Filer |
+----------+ | | +-------------+
| |
| |
|1 2|
v v
+----------------------------+
| Router |
+----------------------------+
^ ^ ^ ^ ^ ^
1| 2| 3| 1| 2| 3|
| | | | | |
v v v v v v
+------------------------+ +-----------------------+
| Xen Node 01 | | Xen Node 02 |
+------------------------+ +-----------------------+
All links are Gbps. Links (1) are for the internet connection, links
(2) are for the iSCSI connection and links (3) are for internal
network.
We have a Nagios monitoring server on one of the xen node. Sometimes,
latencies to the others virtual servers on Node 01 and Node 02 explode
(more than 500ms instead of 0.5ms).
Also, sometimes load average of virtual servers with NFS client (NFS
server is in a virtual server too) increases a lot during 1 ou 2
minutes for no apparent reason.
I guess it is a virtual server that consumes disproportionately
(network or disk i/o).
But I do not know how to accurately determine which server or element
generates these latencies.
Xen version is 4.0.1 on Debian Squeeze.
Do you have any tips ?
Thanks,
Neri