From: Adams Kevin J (kevin.adams@PHS.COM)
Date: Thu Aug 29 2002 - 14:32:46 EDT
NMON says I'm not using AIO.
Asynchronous I/O Processes
Total AIO processes= 10 Actually in use= 0 CPU used= 0.0%
All time peak= 10 Recent peak= 0 Peak= 0.0% (use 0 to
reset)
We use Sybase via raw logical volumes that supposedly requires AIO to even
startup. Sybase does not complain.
Here is my AIO setup:
# lsattr -El aio0
minservers 10 MINIMUM number of servers True
maxservers 100 MAXIMUM number of servers True
maxreqs 4096 Maximum number of REQUESTS True
kprocprio 39 Server PRIORITY True
autoconfig available STATE to be configured at system restart True
fastpath enable State of fast path True
# pstat -A|grep aio
39 s 27a1 1f90 unbound RR 27 0 aioserver
41 s 2971 2568 unbound RR 27 0 aioserver
48 s 3065 1c42 unbound RR 27 0 aioserver
49 s 3167 1e46 unbound RR 27 0 aioserver
51 s 3379 1452 unbound RR 27 0 aioserver
52 s 346d 163e unbound RR 27 0 aioserver
53 s 356f 2650 unbound RR 27 0 aioserver
54 s 3671 2752 unbound RR 27 0 aioserver
55 s 3775 2856 unbound RR 27 0 aioserver
56 s 3875 2956 unbound RR 27 0 aioserver
We have 32 SSA disk and 24 ESS disks.
I would think I would be using more than minimum. I assume AIO is needed at
the hdisk level and not pdisk.
So, whats going on here. How can I tell for sure?
Kevin Adams
-----Original Message-----
From: Green, Simon [mailto:SGreen@KRAFTEUROPE.COM]
Sent: Thursday, August 29, 2002 4:34 AM
To: aix-l@Princeton.EDU
Subject: Re: [aix-l] about aio
AIO servers are available to whatever wants them, (provided they're not
already in use), so those initial ones will be available to Oracle.
The danger with setting a high value is that your I/O system can only cope
with so much; you could overload it. Better to figure out a good value and
specify that.
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: 29 August 2002 11:40
To: aix-l@Princeton.EDU
Subject: about aio
Hello,
is there any reason not to set maxservers to 1000 (max. value)?
There might be unused processes then, but why should I care?
If I understand minservers correctly, this number determines how many
aio-servers are started at boottime.
But these aio-servers run as root. Why? Cant it be changed?
Do they get used by f.e. an oracle-user?
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