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IDS Forum

Re: Informix and thin provisioning

Posted By: Andreas Legner1
Date: Wednesday, 13 December 2017, at 11:21 a.m.

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

Hi Luis,

not sure I fully understand what you mean/want:

You've logically emptied these sbspaces, i.e. deleted their sblob content
using SQL means, so now ... you want some of the chunks' space returned to
the OS?
Or would you want to have all those freed sbspace pages zeroed so some
storage magic would be able to 'thin provision', i.e. re-use, the space
underneath?

For obvious performance reasons, freeing space in Informix always was a
logical-only operation, so the space only gets 'unassigned' from an object,
but otherwise is left alone and its content untouched.
So are you asking for getting FREE space zeroed out? So storage layer can
re-purpose such unused areas to other users while Informix' chunks remain
fully configured and available to Informix?

Sounds interesting. I'd say one for our RFE list, please provide more
details on this 'think provisioning'.

Still having to find again in how far 'sparse files' had hurt us (we don't
want them and make sure we don't have them) and in how far similar problems
could arise with such thin provisioning.

BR,
Andreas

From: "LUIS VENTURA" <luisventurap@gmail.com>
To: ids@iiug.org
Date: 12/13/2017 04:07 PM
Subject: Informix and thin provisioning [40366]
Sent by: ids-bounces@iiug.org

Hi all:

We have several huge sbspaces in one of our instances (12.10FC7). After
deleting almost all the blob rows contained in it Informix is showing the
sbspaces as almost empty. But, from the storage point of view, no changes
have
been shown.

As per aour tests, the problem is that Informix is not zeroing the free
space
of the sbspaces, so our storage array is not being able to use the "thin
provisioning" capability.

Our chunks are based on raw devices con SUSE linux, so we cannot interact
with
them directly from the OS.

Anybody knows if there is any method to release this free space in the
storage
array?

Thank you in advance and best regards.

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

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