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IDS Forum

Re: define raw device on Redhat Linux

Posted By: FRANK
Date: Friday, 15 October 2010, at 11:01 a.m.

In Response To: Re: define raw device on Redhat Linux (FRANK)

The "Middleman " is still on the loose....

IDS could complete Check points , flush data... to disk successfully
without disks available!

It is strongly suspected that the "guy" is hidden in the "raw character
devices".... created by......, agree?

Good news: The Boss has rewarded $10,000 for any tips leading to the
capture of the "Middleman"!

Good luck!
Frank

On Wed, Oct 13, 2010 at 10:25 PM, FRANK <yunyaoqu@gmail.com> wrote:

> Thanks a lot, Art!
>
> Sorry not gave the description clearly.
>
> This is a brand new installation and testing.
>
> (1) created a new db root chunk ( the only one we created) pointed to the
> raw character device defined by the system administrator. It was the only
> chunk we defined for the instance that was used for every thing : root
> dbs, logical/physical log, data .......
> (2) created a new table in the chunk, started a looping script that
> just kept inserting new row into the table
> (3) pulled out the two disk driver cables( physically cut the disk
> connection, so NO DISK available now!) that bridged Disk to EMC
> Powerpath. The RedHat connected to EMC powerpath. IDS was not impacted,
> stayed online as normal.
> (4) we saw the loop script job paused for around 20 seconds...., then
> resumed doing the inserting job perfectly......
> (5)IDS keep working continuously without any sense of disk failure during
> the whole procedure. ( Logical log completed one by one.....)
>
> So, we think the IDS was cheated somehow... and data was taken by a
> Middleman..... So, we are looking for the Middleman...
>
> Thanks,
> Frank
>
> On Wed, Oct 13, 2010 at 7:45 PM, Art Kagel <art.kagel@gmail.com> wrote:
>
> > Frank,
> >
> > The problem is not your RAW device definitions, it is your understanding
> of
> > what Informix is doing and how it does transactions. Remember that
> Informix
> > ONLY works on data pages that are in its cache, so as long as the data
> that
> > is being modified by your transactions is already in cache (or would be
> on
> > a
> > new page and so only written initially to cache) Informix will not be
> > modifying the chunks on disk and will not realize that the disk has gone
> > bad. Dirty pages are flushed to disk when the lru_min/max_dirty
> thresholds
> > are reached or during or after a checkpoint. There is one exception.
> > Logical and physical log pages are immediately written to disk. You could
> > try destroying the raw partition or physically removing the disk drive
> for
> > the logical logs and see what happens, but that's not going to get you
> > quicker responses for the other chunks.
> >
> > Also, is it possible that the engine is actually still able to write to
> the
> > device after you disabled the device drivers? Perhaps the OS is
> maintaining
> > the path to the raw device even with the device driver removed because a
> > process has the device open. Your test may not be valid. Try physically
> > removing or powering down the drive itself.
> >
> > Art
> >
> > Art S. Kagel
> > Advanced DataTools (www.advancedatatools.com)
> > IIUG Board of Directors (art@iiug.org)
> >
> > Disclaimer: Please keep in mind that my own opinions are my own opinions
> > and
> > do not reflect on my employer, Advanced DataTools, the IIUG, nor any
> other
> > organization with which I am associated either explicitly, implicitly, or
> > by
> > inference. Neither do those opinions reflect those of other individuals
> > affiliated with any entity with which I am affiliated nor those of the
> > entities themselves.
> >
> > On Wed, Oct 13, 2010 at 6:44 PM, FRANK <yunyaoqu@gmail.com> wrote:
> >
> > > Thanks, Andreas.
> > > I give more detailed on this problem.
> > >
> > > We are setting up the IDS11.50 FC7 of RedHat Linux 5, using EMC
> Clariion
> > > disk.
> > > The Sysadmin defined the raw disk (character device), and Logical
> > Volumes.
> > >
> > > We did the test to make sure the data would not be buffered(should be
> > > written to disk immediately) when the transaction is committed.
> > >
> > > But, the result is that, after we disabled the disk drivers, IDS keeps
> > > running and committing transactions.... So , the committed data is
> > > buffered somewhere....
> > >
> > > We want to know what is the problem, wrong character device defined?
> Red
> > > Hat and EMC?, or other?......
> > >
> > > Basically, How to setup Redhat/EMC raw character device to make sure it
> > > does not buffer data when there is a disk problem , so IDS can abort
> the
> > > job immediately.
> > >
> > > Thanks
> > > Frank
> > >
> > > On Wed, Oct 13, 2010 at 5:08 AM, Andreas Breitfeld <
> abreitfe@de.ibm.com
> > > >wrote:
> > >
> > > > On Tuesday 12 October 2010 19:30:59 FRANK wrote:
> > > > > Folks,
> > > > >
> > > > > IDS11.50 FC7, Redhat Linux5
> > > > >
> > > > > Our sysadmin is working on Logical volume definition for our new
> EMC
> > > > > Clarion ... Disk.
> > > > > We saw http://www.informix-zone.com/node/38 is a good paper for
> > > getting
> > > > > a Character device ( not Block device) in Suse Linux.
> > > > > Just, want to check if there is more such type of info ... on
> Redhat
> > > ...
> > > > If O_DIRECT is an option for you:
> > > >
> > > >
> > >
> >
> http://dbaspot.com/forums/informix/147617-how-setup-block-devices-o_direct-
> > > > rhel5.html
> > > >
> > > > Thanks,
> > > > Andreas
> > > >
> > > > >
> > > > > Thanks,
> > > > > Frank
> > > > >
> > > > > --001485f274e2cfbabd04926ed644
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
> ***************************************************************************
> > > > > **** Forum Note: Use "Reply" to post a response in the discussion
> > > forum.
> > > > >
> > > >
> > > > --
> > > > Andreas Breitfeld; Informix Development Munich
> > > > IBM Deutschland Research & Development GmbH; Vorsitzender des
> > > > Aufsichtsrats:
> > > > Martin Jetter; Geschaeftsfuehrung: Dirk Wittkopp; Sitz der
> > Gesellschaft:
> > > > Boeblingen; Registergericht: Amtsgericht Stuttgart, HRB 243294
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > >
> > > --001485f1e44090f7b8049287541a
> > >
> > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --0016361e81deaa5bc10492883076
> >
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --001485f03cac6f58c504928a6acd
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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