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IDS Forum

IDS 11.50/AIX 5.3 Slowness Issue?

Posted By: Eric Rowell
Date: Monday, 11 April 2011, at 12:20 p.m.

OK I have sent the following to support but because it is a
performance issue we are on a slow boat traveling in circles.

I'm sure this is related to a configuration issue but I cannot figure
which. I've got a feeling I'm overlooking something very easy.

Any suggestions on what area I should focus on would be helpful. I
have tried OS related and Informix Configuration changes to no good
conclusion (I can list if anyone would like... 100 or so changes made
and reverted). Masters of Informix guide me in my time of darkness.

Problem:
When running anything from within Informix we get no more than
5-7MB/sec (as seen by looking at the SAN). When selecting we get very
flat activity until the process is done. My Laptop running VMware
with Informix runs faster...

Baseline Information:
This occurs if the connection is made via Local Loopback (Apps
connect here), Remotely (DW pulls) or Shared Memory (Admins).
Server is 90% Idle when queries run.
When accessing the commandline, data can be moved at a rate between
75-125MB/sec using dd. This includes to and from the informix
chuncks.

Configuration:
IDS: 11.50
AIX: 5.3 TL9
4GL: 7.50 (Application is local to the DB Server)
Vxfs: 5.0.3 (Used to provide replication - Planing to remove ASAP)

IBM P520 (2 CPU - Dual Core, 8G, Dual 2G HBA)
Compellent Model 30 SAN 8G Fiber connected via switch (Disabled
Tiering for this server for testing Tier 1 FC Storage)

AIX AIO Settings: (Have tried smaller and larger values with no difference)
MIN: 200
MAX: 800
REQ: 16384
PRI: 39
State: Available
Fast Path: enable

Test Query Per support (Queries take 30 minutes to run, dd of the data
is less then 3 minutes):
time dbaccess product <<!

UNLOAD TO /dev/null
SELECT * FROM job_rules;
!

Test Query Per support:
time dbaccess product <<!
CREATE TEMP TABLE speed_test(

dept_code char(3) not null ,

community char(2) not null ,

lot char(4) not null ,

unit_id char(2),

optid char(7) not null ,

option_category char(3) not null ,

group_seq integer,

gen_flag char(1),

create_per char(10)

default user,

create_dt date

default today,

updat_per char(10)

default user,

updat_dt date

default today,

updat_time datetime hour to second

default current hour to second

) FRAGMENT BY ROUND ROBIN IN tempdbs01, tempdbs02, tempdbs03, tempdbs04;

INSERT INTO speed_test
SELECT * FROM job_rules
!

Fiber Card Performance:
FC SCSI Adapter Driver Information
No DMA Resource Count: 0
No Adapter Elements Count: 0
No Command Resource Count: 0

IP over FC Traffic Statistics
Input Requests: 0
Output Requests: 0
Control Requests: 0
Input Bytes: 0
Output Bytes: 0

FC SCSI Traffic Statistics
Input Requests: 542306
Output Requests: 2000560
Control Requests: 64
Input Bytes: 9420192051
Output Bytes: 25358181400

HBA Configuration:
FC Adapter fcs2
Description FC Adapter
Status Available
Location 0B-08
Maximum number of COMMANDS to queue to the adapter [2048] +#
Maximum Transfer Size [0x1000000] +
Preferred AL_PA [0x1] +
INIT Link flags [pt2pt] +
Long term DMA [0x8000000] +

Disk Device Configuration has been adjust up and down but doesn't
effect the runtime of Informix. dd does see beter response with a
higher queue depth than the default 32.

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