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IDS Forum

Re: Logical Log Sizing

Posted By: Martin Fuerderer1
Date: Wednesday, 16 August 2017, at 11:34 a.m.

In Response To: Logical Log Sizing (DAN MUELLER)

Hi,

I'd think you can make the logs bigger. So big that you have "only"

about

100 logical logs (providing the same total log space you have now).

That

way the percentage calculations (e.g. for the high watermarks) still

work

reasonably accurate.

If you worry about loosing logical log records due to a disk problem,

you may consider mirroring the dbspace(s) that contain the logical

logs (using plain old Informix mirroring or some other method e.g. on

a

file system level).

Regards, Martin

--

Martin Fuerderer

Informix Development Germany

HCL Technologies Germany GmbH

Frankfurter Ring 17

80807 Munich, Germany

e-mail: martin.fuerderer1@de.ibm.com

[1]http://www.hcltech.com/de

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From: "DAN MUELLER" <ddmueller@west.com>

To: ids@iiug.org

Date: 08/15/2017 11:51 PM

Subject: Logical Log Sizing [39714]

Sent by: ids-bounces@iiug.org

_________________________________________________________________

Hey Folks,

IDS 11.70.FC8XC4

AIX 7.2

The short of it is that I am looking for some logical log sizing

suggestions.

Let me explain what I am facing

I have 644 logical logs sized at 100Mg each. On most days I will use

approx.

200 of these. On peak days, I will use 600 thus the total number of

logs that

I can go a day w/o backing up.

I also just swapped from TSM to NBU storage managers. During peak

times, I

will go through 4 logs a minute and the storage manager (NBU) cannot

keep up

with backing them up. On Sunday, I had > 300 that needed to be backed

up.

Backups of the logs were happening however a lot slower than I was

using them.

They were backing up at about 25 - 30 seconds per log. Coincidentally,

TSM

never experienced this lag.

Working with the storage manager folks here, they tell me that this is

the

best they can do and that I need to use larger logs because this size

is not

efficient. It takes longer for the storage manager overhead than it

does to

actually back up the log.

Finally, I have always been apprehensive about very large logical logs

because

if I lose that disk, I lose more data.

So, is anyone using very large logical logs? If so, what size are you

using?

Also, for any NBU users out there. Are there any magic bullets you

could throw

my way or any "suggested" sizes I should be thinking about?

Sorry for the long winded issue,

Dan

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References

1. http://www.hcltech.com/de

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