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#1 (**permalink**) 01-04-2008, 09:41 PM

Help!

I am having trouble with the new 630 system we have installed. The
disks have been set up using LVM with 3 disks mirrored and maximum
spread accross the disks.

We are running oracle 8.0.5

We are getting excessive Waiting IO figures although the disk io shows
that there is very little activity on the disks.

I was told by the IBM IT Specialist to run the command

chfs -a options=cio <mount point>

I can find no reference to this command. The system is slower since
running it. I wish to switch the option off bit cannot find out how to
do so.

Any help?

Thanks in advance.

#2 (**permalink**) 01-04-2008, 09:41 PM

"Peter" <pcarter@telkomsa.net> schrieb im Newsbeitrag
news:c2700c2e.0402180541.69032976@posting.google.c om...
> Help!
>
> I am having trouble with the new 630 system we have installed. The
> disks have been set up using LVM with 3 disks mirrored and maximum
> spread accross the disks.
>
> We are running oracle 8.0.5
>
> We are getting excessive Waiting IO figures although the disk io shows
> that there is very little activity on the disks.
>
> I was told by the IBM IT Specialist to run the command
>
> chfs -a options=cio <mount point>
>
> I can find no reference to this command. The system is slower since
> running it. I wish to switch the option off bit cannot find out how to
> do so.
>
> Any help?
>
> Thanks in advance.

Hi Peter,
nice trick to supply you with undocumented options without telling you what
for that should be and how to get rid of it ;-)

# chfs -a options=rw <mount point>

HTH,
Andreas

#3 (**permalink**) 01-04-2008, 09:41 PM

Hi,

I should have just thought about what the chfs command does. All I
needed to do was edit the /etc/filesystems file and remove the
options=cio from the file system.

I have also found a great white paper on the subject for anyone
interested. search for wpAIXcio052703 on the IBM web site.

Thanks

"Andreas Schulze" <b79xan@gmx.de> wrote in message news:<c0vrer$9s72@news-1.bank.dresdner.net>...
> "Peter" <pcarter@telkomsa.net> schrieb im Newsbeitrag
> news:c2700c2e.0402180541.69032976@posting.google.c om...
> > Help!
> >
> > I am having trouble with the new 630 system we have installed. The
> > disks have been set up using LVM with 3 disks mirrored and maximum
> > spread accross the disks.
> >
> > We are running oracle 8.0.5
> >
> > We are getting excessive Waiting IO figures although the disk io shows
> > that there is very little activity on the disks.
> >
> > I was told by the IBM IT Specialist to run the command
> >
> > chfs -a options=cio <mount point>
> >
> > I can find no reference to this command. The system is slower since
> > running it. I wish to switch the option off bit cannot find out how to
> > do so.
> >
> > Any help?
> >
> > Thanks in advance.
>
> Hi Peter,
> nice trick to supply you with undocumented options without telling you what
> for that should be and how to get rid of it ;-)
>
> # chfs -a options=rw <mount point>
>
> HTH,
> Andreas

#4 (**permalink**) 01-04-2008, 09:42 PM

"Andreas Schulze" <b79xan@gmx.de> wrote in message news:<c0vrer$9s72@news-1.bank.dresdner.net>...
> "Peter" <pcarter@telkomsa.net> schrieb im Newsbeitrag
> news:c2700c2e.0402180541.69032976@posting.google.c om...
> > Help!
> >
> > I am having trouble with the new 630 system we have installed. The
> > disks have been set up using LVM with 3 disks mirrored and maximum
> > spread accross the disks.
> >
> > We are running oracle 8.0.5
> >
> > We are getting excessive Waiting IO figures although the disk io shows
> > that there is very little activity on the disks.
> >
> > I was told by the IBM IT Specialist to run the command
> >
> > chfs -a options=cio <mount point>
> >
> > I can find no reference to this command. The system is slower since
> > running it. I wish to switch the option off bit cannot find out how to
> > do so.
> >
> > Any help?
> >
> > Thanks in advance.
>
> Hi Peter,
> nice trick to supply you with undocumented options without telling you what
> for that should be and how to get rid of it ;-)
>
> # chfs -a options=rw <mount point>
>
> HTH,
> Andreas

This might help --> http://www-1.ibm.com/servers/aix/whi...b_perf_aix.pdf

Rgds
Mark Taylor

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