Exadata Cell init and trace files location version 11.2.3.1.1

Exadata Cell init file: version 11.2.3.1.1
This is just an example:
/opt/oracle/cell11.2.3.1.1_LINUX.X64_120426/cellsrv/deploy/config

Exadata Cell trace files: version 11.2.3.1.1
This is just an example:
/opt/oracle/cell11.2.3.1.1_LINUX.X64_120426/log/diag/asm/cell/<cell hostname>/trace

How to update init files and gather trace:
0. offline disks
1. update cellinit.ora with event trace
2. offline cells
3. stop/start celld/check trace enable
    service celld stop
    service celld start
or
CellCLI> alter cell shutdown services all;
CellCLI> alter cell startup services all;

    cd $CELLTRACE
    view alert*log
4 online disks