OES11 SP1 nss process high cpuq

Hi,
since sunday, on one of my oes11sp1 cluster node, the cpu is very high. I have some nss xx process (where xx is a number) wich take a lot of cpu, and my server is swapping (his got 32Gb of Ram). The other node is fine.
I can't find the root cause of this issue, nothing in the log and when i try strace -p to trace nss process i have a operation not permitted error.
Of course i can reboot my node after migrating ressouces, but i want to understand why :-)
Regards
Stphane

On sunday we have the full backup. But it was finished at 11h00 and my cpu activites start at 00h30 and finished at 12h00 on monday. No backup at this time.
I was unable to see wich was causing this filesystem activity. I try to see in NRM if a use was actively copying file, but the more active only consume 3 Gb of NCP Read/write
Stephane

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                        111                       1111    1111111111
              999999999900077777777799999777778888000099990000000000
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     60       ******************************************************
     50       ******************************************************
     40       ******************************************************
     30       ******************************************************
     20       ******************************************************
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     70                          ***********************************
     60                          ***********************************
     50                          ***********************************
     40                          ***********************************
     30                          ***********************************
     20                          ***********************************
     10                          ***********************************
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    2011-11-18 16:12:02.617: [ora.asm][1510000960] [check] CrsCmd::ClscrsCmdData filter on NAME eq ora.asm
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    2011-11-18 16:12:02.640: [ora.asm][1510000960] [check] CrsCmd::stat resName ora.asm state ONLINE
    2011-11-18 16:12:02.641: [ora.asm][1510000960] [check] CrsCmd::ClscrsCmdData::stat resname ora.asm 1 1 attr STATE_DETAILS value Started
    2011-11-18 16:12:02.641: [ora.asm][1510000960] [check] CrsCmd::stat resName ora.asm state details Started
    2011-11-18 16:12:02.641: [ora.asm][1510000960] [check] CrsCmd::ClscrsCmdData::stat resname ora.asm 1 1 attr INCARNATION value 1
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    2011-11-18 16:12:04.117: [    AGFW][1342208320] CHECK initiated by timer for: ora.jpharm.db 1 1
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    2011-11-18 16:12:04.118: [    AGFW][1711352128] check for resource: ora.jpharm.db 1 1 completed with status: ONLINE
    2011-11-18 16:12:05.117: [    AGFW][1342208320] CHECK initiated by timer for: ora.jpharm.db 1 1
    2011-11-18 16:12:05.118: [    AGFW][1778469184] Executing command: check for resource: ora.jpharm.db 1 1
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    2011-11-18 16:12:05.118: [    AGFW][1778469184] check for resource: ora.jpharm.db 1 1 completed with status: ONLINE
    2011-11-18 16:12:06.117: [    AGFW][1342208320] CHECK initiated by timer for: ora.jpharm.db 1 1
    2011-11-18 16:12:06.118: [    AGFW][1744910656] Executing command: check for resource: ora.jpharm.db 1 1
    2011-11-18 16:12:06.118: [ora.jpharm.db][1744910656] [check] Gimh::check condition (GIMH_NEXT_NUM) 9 exists
    2011-11-18 16:12:06.118: [    AGFW][1744910656] check for resource: ora.jpharm.db 1 1 completed with status: ONLINE
    2011-11-18 16:12:07.117: [    AGFW][1342208320] CHECK initiated by timer for: ora.jpharm.db 1 1
    2011-11-18 16:12:07.118: [    AGFW][1308649792] Executing command: check for resource: ora.jpharm.db 1 1
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    2011-11-18 16:12:07.118: [    AGFW][1308649792] check for resource: ora.jpharm.db 1 1 completed with status: ONLINE
    2011-11-18 16:12:08.117: [    AGFW][1342208320] CHECK initiated by timer for: ora.jpharm.db 1 1
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    2011-11-18 16:12:08.118: [    AGFW][1644235072] check for resource: ora.jpharm.db 1 1 completed with status: ONLINE
    oracle@pceudb9:/u01/app/oragrid/11.2.0/log>
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