ADSM-L

[ADSM-L] Lots of "Wait" on the CPU

2008-11-20 10:26:02
Subject: [ADSM-L] Lots of "Wait" on the CPU
From: Howard Coles <Howard.Coles AT ARDENTHEALTH DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 20 Nov 2008 09:24:49 -0600
Ladies and Gents, of those of you who run AIX I have a question:
What would cause the wait of the CPU to constantly be this high? (or
what are some of the things)  My Disk is barely busy, the NIC which is
etherchanneled in failover mode, doesn't appear peaked out, so I'm
looking for some ideas.  Below is a snapshot of the topas screen:

Topas Monitor for host:    tultsm01             EVENTS/QUEUES
FILE/TTY
Thu Nov 20 09:18:00 2008   Interval:  2         Cswitch    1275  Readch
14.0M
                                                Syscall    1211  Writech
14.3M
Kernel    2.0   |#                           |  Reads       187  Rawin
0
User      2.8   |#                           |  Writes       61  Ttyout
135
Wait     83.0   |########################    |  Forks         0  Igets
0
Idle     12.2   |####                        |  Execs         0  Namei
0
                                                Runqueue    0.0  Dirblk
0
Network  KBPS   I-Pack  O-Pack   KB-In  KB-Out  Waitqueue   0.0
en3     201.2    123.5    93.0   137.7    63.5
lo0       0.0      0.0     0.0     0.0     0.0  PAGING           MEMORY
                                                Faults        0  Real,MB
10240
Disk    Busy%     KBPS     TPS KB-Read KB-Writ  Steals        0  % Comp
13.3
hdisk2    0.0    14.1K   90.5    14.0K  128.0   PgspIn        0  %
Noncomp   2.2
hdisk1    0.0     0.0     0.0     0.0     0.0   PgspOut       0  %
Client    2.2
hdisk0    0.0     0.0     0.0     0.0     0.0   PageIn        0
cd0       0.0     0.0     0.0     0.0     0.0   PageOut       0  PAGING
SPACE
                                                Sios          0  Size,MB
512
Name            PID  CPU%  PgSp Owner                            % Used
0.0
dsmserv      413784   3.1 127.7 root            NFS (calls/sec)  % Free
100.0
topas        266266   0.2   1.6 root            ServerV2       0
gil           49176   0.0   0.1 root            ClientV2       0
Press:
sshd         360670   0.0   0.9 root            ServerV3       0   "h"
for help
xntpd        323600   0.0   0.4 root            ClientV3       0   "q"
to quit

Box is an older rs/6000 7026, with 10 GB RAM, 2 procs, and a single LUN
that is 380 GB (someone just assigned me the whole thing that way).

Oh, running AIX 5.3 ML6, TSM 5.5.1

See Ya'
Howard Coles Jr.
Sr. Systems Engineer
Ardent Health Services
615-296-3416
John 3:16!

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