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IDS Forum

Re: Informix and thin provisioning

Posted By: Andreas Legner1
Date: Wednesday, 13 December 2017, at 12:12 p.m.

In Response To: Re: Informix and thin provisioning (LUIS VENTURA)

Well, there might be an easier solution for this:

before running those big updates, on sblob columns, create a new small
sbspace, modify those sblob columns to use this new sbspace, then run the
update. Your dummy sblob(s) now should reside in new sbspace and old ones
should be completely unused so you can drop them entirely.

Maybe too simple a thought ?

From: "LUIS VENTURA" <luisventurap@gmail.com>
To: ids@iiug.org
Date: 12/13/2017 06:01 PM
Subject: Re: Informix and thin provisioning [40372]
Sent by: ids-bounces@iiug.org

Hi Andreas:

Exactly, what we need is zeroing the free part of the chunks to make this
space available from the storage array point of view.

I know it could sound weird, but I know that this space won't be needed by
Informix. I'll post the full picture to help you understand the exact
situation:

- This is a test environment used to do full restores of our production
database (which actually has 9Tb of blobs)
- Once restored, we run a stored procedure which updates almost all of
these
blobs to the same binary file. Due to the smart blobs way of work this
creates
million of pointers to one file, and free the most of the sbspace area. So,

after running this procedure, we have nine sbspaces with 12Tb reserved
space
but only 300Gb of used space. At the storage array level, I can see 9Tb
occupied, as it has been used during the restore.
- At this point, I would like to return all this free space to the storage
array, as I know that this space won't be used again.

As this is a test environment, we have tried to move all the blobs to the
first sbspace to get the rest dropped and recreated after doing a dd
if=/dev/zero of=/dev/anydev, but for some reason we are not able to
completely
move all the objects (I've opened a case with Tech Support for this, as it
seems that we have some kind of orphaned blobs...)

So, as I cannot drop the chunks, I'd need a way to free this space without
dropping the chunks...

*******************************************************************************

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