Topic
  • 1 reply
  • Latest Post - ‏2013-04-05T19:54:11Z by nagger
SystemAdmin
SystemAdmin
2402 Posts

Pinned topic nmon shows no Real free memory, can this be the cause for a reboot?

‏2013-03-27T12:35:07Z |
I have a 2 nodes Oracle RAC cluster (Oracle Version 11.2.0.3) with nodes let's call them host1 and host2 (2 different LPARs) - OS is AIX 6.1.7.5 64 bit.

On 25th march 2013 about 1:37 o'clock the node host1 sent a reboot to node 2 (host2) because host1 could not reach host2 via rac interconnect (network is ok and was available).

Now I'v made a nmon analysis and host2 shows that there is no more real free memory on host2 before reboot on 1:37 o'clock. Can this be a cause that host1 cannot reach host2?

Attached the screenshot of Real free memory.

Thanks in advance for some hints/advice.
Luise
Updated on 2013-04-05T19:54:11Z at 2013-04-05T19:54:11Z by nagger
  • nagger
    nagger
    1685 Posts

    Re: nmon shows no Real free memory, can this be the cause for a reboot?

    ‏2013-04-05T19:54:11Z  
    HI,
    I am not sure what the units are on the graph.
    But AIX usually runs with low memory and the lrud process paging pages out to keep the freelist non-zero.
    You could tune that but it is unlikely zero memory would stop your network - the kernel will have lots of buffering space already.
    I have no information of the criteria Oracles uses to shoot its partner.
    It's there an Oracle log?

    cheers, Nigel