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Jan Abraham wrote:
>
> Unfortunately, the web servers are freezing for some seconds from time
> to time. The phenomenon occurs in unregular intervals (1-5 minutes)
> indepentently on each server.
>
> During these freezes, I can still type commands into the shell, but
> they get not executed until the freeze is over. Afterwards, the load
> increases rapidly, and some apache threads seem to die.
>
I guess this issue is not related to LVS.
Linux generally freezes because of I/O operations, that is to say
network I/O or more probably disk I/O.
First thing is to try to identify which process(es) is(are) blocked on
some I/O. There are many possible issues with apache+php+mysql trio.
A 'vmstat 1' and 'pstree -p', before and during freeze, would be very
useful to diagnose you problem. Also, please include some basic hardware
information about your realservers.
Regards,
Nicolas.
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