IDS Forum

Re: FLASH: APAR: Adding a space with non-default p

Posted By: Art Kagel
Date: Thursday, 1 September 2016, at 4:35 p.m.

FYI: This is fixed in v12.10.FC7 and later.

An update from the APAR notice pages:

Flash (Alert)

Abstract

On Linux x86_64 (64-bit), if a data storage space with a non-default page
size and an initial chunk size + offset in the new space less than 2GB is
added, after upgrading to Informix Dynamic Server (IDS) 12.10.xC6, the
server may report this message in the online.log: "Assert Failed: Chunk
<number> is being taken OFFLINE".
Content

APAR IT13478
<https://www-304.ibm.com/support/entdocview.wss?rs=630&uid=swg1IC65787> is
used to track this issue. IDS 12.10.FC7 contains the fix for this problem
and is available for download from Fix Central:
http://www-933.ibm.com/support/fixcentral/

This problem occurs if all these conditions are met:

- Product is Informix, version 12.10.FC6, on Linux x86_64 (64-bit).

- The IDS instance is migrated from some prior version.

- A new space is added in 12.10.FC6 with an initial chunk size + offset

in the new space less than 2GB.

- If the new space is created with the default page size (2K), the

defect occurs but only in a very mild form. Data corruption will not

result. The defect will cause page headers in this particular space to be

written in an older format, but otherwise the space will be entirely

usable. IBM would, however, recommend recreating this space once the fixed

IDS version is in place.

- If a new space is created with a page size greater than 2K, the defect

will cause corruption of the data in that particular space. To cure the

problem that space will have to be dropped, and then recreated using the

fixed IDS version.

In both of the cases described above, the first chunk in the space will

be lacking the 'B' flag in an onstat -d output. The 'B' flag means

"Bigchunk Format". Since the first chunk is not in bigchunk format it lacks

this flag. Additional chunks added to this affected space may be in either

the bigchunk or the older format, depending on a couple of factors. The

format of these additional chunks is not important, however. What is

important is that any space described by scenario 2 should be dropped and

recreated with a fixed version of IDS as soon as possible. As mentioned

above, a space that falls into scenario 1 will be healthy but we recommend

that it be recreated anyway once the fix is in place.

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.com

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on 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 Thu, Sep 1, 2016 at 4:30 PM, Art Kagel <art.kagel@gmail.com> wrote:

> See the APAR notice below! Looks serious!
>
> Art
>
> Art S. Kagel, President and Principal Consultant
> ASK Database Management
> www.askdbmgt.com
>
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and do not reflect on 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.
>
>
> ---------- Forwarded message ----------
> From: IBM My Notifications <mynotify@stg.events.ihost.com>
> Date: Thu, Sep 1, 2016 at 4:27 PM
> Subject: FLASH: APAR: Adding a space with non-default page size after
> upgrading to IDS 12.10.FC6 on Linux x86_64 (64-bit), may result in an
> Assertion Failure and data corruption (2016.09.01)
> To: ART.KAGEL@gmail.com
>
>
> Check out the IBM Support <https://ibm.biz/support-pilot> beta [image:
> IBM]
> Here are your updates from IBM My Notifications.
> Contents: Informix Servers : Flashes
> Informix Servers : Flashes
> APAR: Adding a space with non-default page size after upgrading to IDS
> 12.10.FC6 on Linux x86_64 (64-bit), may result in an Assertion Failure and
> data corruption
> <http://www.ibm.com/support/docview.wss?uid=swg21989667&myns=swgimgmt&mynp=OCSSGU8G&mync=E&cm_sp=swgimgmt-_-OCSSGU8G-_-E>
>
> <http://www.ibm.com/support/docview.wss?uid=swg21989667&myns=swgimgmt&mynp=OCSSGU8G&mync=E&cm_sp=swgimgmt-_-OCSSGU8G-_-E>
> On Linux x86_64 (64-bit), if a data storage space with a non-default page
> size and an initial chunk size + offset in the new space less than 2GB is
> added, after upgrading to Informix Dynamic Server (IDS) 12.10.xC6, the
> server may report this message in the online.log: "Assert Failed: Chunk
> <number> is being taken OFFLINE".
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