How Oracle Works on Exadata - Oracle Exadata Recipes: A Problem-Solution Approach - page 70

• The cluster interconnect needs to point to the bonded InfiniBand interface on the compute

nodes. On Exadata, the Grid Infrastructure installation will properly set the cluster
interconnect to the InfiniBand bonded interface.

3-7. Tracing cellsrv on the Storage Servers
Problem
You know from Oracle documentation or resources that cellsrv is responsible for performing I/O operations as
well as delivering Exadata Storage Server software features, but in order to troubleshoot I/O performance issues and
ensure that the Exadata cell servers are operating at their peak capacity, you wish to learn how to trace cellsrv on the
Exadata storage cells.

Solution
First, log in to one of your Exadata Storage Servers as root and find the cellsrv Linux process. We'll search for
“ cellsrv 100, ” knowing that cellsrv is launched as a process with 100 threads:

[root@cm01cel01 ~]# ps -ef | grep "cellsrv 100"
root 570 569 0 Jul31 ? 00:03:59
/opt/oracle/cell11.2.2.4.2_LINUX.X64_111221/cellsrv/bin/cellsrv 100 5000 9 5042
root 2513 1641 0 02:21 pts/0 00:00:00 grep cellsrv 100
[root@cm01cel01 ~]#

In the output above, operating system process 570 represents the cellsrv process. Use strace -cf -p to
summarize system calls for cellsrv and all its process threads:

[root@cm01cel01 ~]# strace -cf -p 570
Process 570 attached with 113 threads - interrupt to quit
Process 570 detached
<< lines omitted >>
Process 1253 detached

% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
74.30 191.485468 830 230735 93329 futex
13.19 33.993075 4162 8168 poll
10.62 27.373752 16017 1709 nanosleep
0.64 1.660603 18 89814 clock_gettime
0.39 1.001690 135 7445 io_getevents
0.36 0.931850 62 14984 io_submit
0.16 0.421931 42193 10 restart_syscall
0.15 0.391672 21 18420 4081 recvmsg
0.12 0.306634 31 10006 sendmsg
... Additional output omitted
------ ----------- ----------- --------- --------- ----------------
100.00 257.723006 395386 97410 total
[root@cm01cel01 ~]#