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IDS Forum

Re: Logical Log Sizing

Posted By: BENJAMIN THOMPSON
Date: Thursday, 17 August 2017, at 7:03 a.m.

In Response To: Logical Log Sizing (DAN MUELLER)

Hi Dan,

I don't think your problem is inherent with Netbackup. Just looking at one of our system which uses 200 Mb logs and can fill one of these in well under a minute before calling onbar to send it to Netbackup taking around 12 s to do so.

20:01:40 Logical Log 733193 Complete, timestamp: 0xee4da9cd.
20:01:40 Logical Log 733193 - Backup Started
20:01:52 Logical Log 733193 - Backup Completed

In general it is true that you might need larger logs because there is a "backup set up time" incurred once regardless of the logs you intend to send.

However, I would suggest your NBU system may benefit from tuning especially if network latency could be an issue. Informix side, I think you can only tune:

BAR_NB_XPORT_COUNT 100
BAR_XFER_BUF_SIZE 31

I have shown the settings we use. We don't have a NBU server dedicated to Informix.

Like with Informix, Netbackup performance can be heavily dependent on the storage used for backups.

Finally, on your comment of log size versus data loss. I doubt any business will state acceptable data loss in terms of the maximum size of an Informix logical log. If you want zero or close to zero data loss in the event of the complete loss of a server the best way to do this is to have a HDR or RSS server running at another site. Then to recover logical logs you roll forward with NBU at least as far as a log that is current on your HDR/RSS and do the last logs by pairing up with the HDR/RSS. This process is in the IBM docs somewhere.

Ben.

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