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IDS 11.10 - 30 Sep 2012
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IDS Forum

RE: Informix on VM

Posted By: James Brunskill
Date: Wednesday, 29 January 2014, at 6:31 p.m.

In Response To: Re: Informix on VM (BILL GLIDDEN)

Hi Bill,

We run Informix Servers on VM's here. Looking at one of our busier ones, OAT tells me we have around 40,000 SQL operations/second.
Not really sure if that's high :)

We have Redhat Linux 5, 64bit, and use cooked files + direct IO, we also have memory set to resident.

Our VM has 2 virtual CPU's and 8 GB of memory assigned, we have just over 4GB assigned to the engine.

I suspect the key is to get plenty of memory assigned, dedicated to your VM. If your host server is not over subscribed on memory or if the VMWare admins can give you a guaranteed slice of memory I wouldn't expect to see huge issues.

In our case the VM performance was better than the physical tin that we replaced. Obviously we moved to new hardware so got benefits from that upgrade.
Personally I'd never go back, Having someone else responsible for the hardware environment is brilliant.

Here's some stats:

onstat -g buf

IBM Informix Dynamic Server Version 11.70.FC2GE -- On-Line -- Up 23:59:45 -- 4186444 Kbytes

Profile

Buffer pool page size: 2048
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
4058526 113560268 6375586435 99.94 6214256 18182794 37667171 83.50

bufwrits_sinceckpt bufwaits ovbuff flushes
57066 87547 0 297

Fg Writes LRU Writes Avg. LRU Time Chunk Writes
0 0 nan 910308

Fast Cache Stats
gets hits %hits puts
124098824 122856766 99.00 23856492

onstat -g glo

IBM Informix Dynamic Server Version 11.70.FC2GE -- On-Line -- Up 1 days 00:02:28 -- 4186444 Kbytes

MT global info:
sessions threads vps lngspins
49 202 14 458

sched calls thread switches yield 0 yield n yield forever
total: 1161286011 221665139 957137218 11538537 32487923
per sec: 6454 4648 1806 112 78

Virtual processor summary:
class vps usercpu syscpu total
cpu 3 49640.37 1580.00 51220.37
aio 5 6.50 23.20 29.70
lio 1 0.00 0.02 0.02
pio 1 0.00 0.01 0.01
adm 1 0.17 0.21 0.38
soc 1 320.08 658.51 978.59
msc 1 0.27 0.07 0.34
fifo 1 0.00 0.02 0.02
total 14 49967.39 2262.04 52229.43

onstat -g iov

IBM Informix Dynamic Server Version 11.70.FC2GE -- On-Line -- Up 1 days 00:04:40 -- 4186444 Kbytes

AIO I/O vps:
class/vp/id s io/s totalops dskread dskwrite dskcopy wakeups io/wup errors tempops
fifo 9 0 i 0.0 0 0 0 0 1 0.0 0 0
kio -1 0 i 36.7 3181428 1035850 2145578 0 9178715 0.3 0 0
kio -1 1 i 34.2 2960095 1001914 1958181 0 8553495 0.3 0 0
kio -1 2 s 22.2 1926212 782766 1143446 0 5952647 0.3 0 0
msc 8 0 i 0.0 1107 0 0 0 1102 1.0 0 1107
aio 7 0 i 9.3 806551 385619 338437 0 793528 1.0 0 2039
aio 10 1 i 0.4 33386 18360 14711 0 44367 0.8 0 10
aio 11 2 i 0.0 1639 641 911 0 2518 0.7 0 1
aio 12 3 i 0.0 230 27 176 0 622 0.4 0 0
aio 13 4 i 0.0 671 281 377 0 898 0.7 0 0
pio 6 0 i 0.0 0 0 0 0 1 0.0 0 0
lio 5 0 i 0.0 0 0 0 0 1 0.0 0 0

Let me know if you want to know any more about our environment, or if you find an awesome vmware speed tips :)
We haven't really done much experimenting with different setups.

Btw: being up for only 24 hrs is due to site power outage, not Informix or VM related...

Cheers,

James Brunskill
Process Information Lead
Fonterra Co-operative Group Limited
james.brunskill@fonterra.com direct +64 7 850 7738 (ext 77808) mobile: +64 21 2400 215
Fonterra Co-operative Group Limited, Te Rapa Dairy Factory, Hamilton, New Zealand

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of BILL GLIDDEN
Sent: Thursday, 30 January 2014 9:28 a.m.
To: ids@iiug.org
Subject: Re: Informix on VM [32389]

At least you could hollow out a chopstick and make a straw :) But you made an interesting point about the i/o throughput because we do seem to suffer a little bit in the i/o performance area. But once the data is cached we're good. So the initial read is a little slow.

I've seen some articles that indicate that cooked files with direct i/o are better on VMs than raw files, but I'd like to test that before I move in that direction.

I'm stuck with the VM, so I'll do what I can. Thanks for the info, Art.

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