How the Live Update Administration Utility (LUAU) 1.5.x works

Article:TECH104351  |  Created: 2008-01-06  |  Updated: 2013-10-24  |  Article URL http://www.symantec.com/docs/TECH104351
Article Type
Technical Solution


Issue



You want to know more about the legacy LUAU 1.x tool and the Definitions being downloaded.

Symptoms
This article is limited to SAV 10.x - 32-bit Definitions only. SEP and/or 64-bit versions will work in a similar manner, but use different file sizes and file names.

 


Solution



1. Settings:
Per default, LUAU is set to only download "New Definitions".
Would it be set to download "old and new Defs" it will increase the amount of files downloaded each LUAU run.
This is not recommended unless for troubleshooting reasons.

2. Behaviour:
LUAU will always download 3 Files with each run. These are the "livetri.zip", the "symtri.zip" & the "symtri16.zip".
From these it will be able to determine if the already existing Defs are up-to-date or if newer ones are available for download.

3. Definitions consist of the following:

1203005079 > describes the changing Sequence of the Defs, the bigger the newer

The monthly Defs (A):
1203005079jtun_sav10enn01m25.m25
1203005079jtun_sav10enn02m25.m25
1203005079jtun_sav10enn03m25.m25
1203005079jtun_sav10enn04m25.m25
1203005079jtun_sav10enn05m25.m25
1203005079jtun_sav10enn06m25.m25
1203005079jtun_sav10enn07m25.m25
1203005079jtun_sav10enn08m25.m25
1203005079jtun_sav10enn09m25.m25
1203005079jtun_sav10enn10m25.m25
1203005079jtun_sav10enn11m25.m25
1203005079jtun_sav10enn12m25.m25

The full Defs, Client only (B):
1203005079jtun_sav10ennful25.m25

The incremental since the last monthly Defs (C):
1204386072jtun_sav10enncur25.m25

The incremental weekly and daily Defs (D):
1204386072jtun_sav10en80213023.m25
1204386072jtun_sav10en80215021.m25
1204386072jtun_sav10en80220003.m25
1204386072jtun_sav10en80225003.m25
1204386072jtun_sav10en80226002.m25
1204386072jtun_sav10en80227003.m25
1204386072jtun_sav10en80228003.m25
1204386072jtun_sav10en80229003.m25

The full Defs, Server only (E):
1204386072jtun_sav10_ennluxdb.x86

4. Facts:
a) LUAU cannot "compile" any Files or Updates apart from the Livetri.zip.
It is only downloading what Symantec publishes on the LU Servers.
As such, any updated files need to be downloaded and cannot be re-created from the existing Deltas.
b) LUAU only keeps a years worth of monthly Defs (C). The typical configuration of LUAU will delete unused files (files not in the livetri.zip)
c) The longer back the incremental Defs go the bigger they get.
d) If no incremental Defs are available to span the Defs between the currently installed and the current available Defs, the Defs (B) & (C) will be used.
e) LU Client will always download the incremental since the last monthly Defs (C) if the Weekly or Daily Defs (D) are not enough.
If it downloads (C) it will also download the smallest available monthly incremental Defs (A) it needs to span the currently installed and the current available Defs.
Should the Defs from (A) have a problem or the set is not within a year, SAV will use (B) & (C).
f) All Defs older than the current month need to point to the same date (the day the monthly Defs (A) are updated)
g) As the current incremental since the last monthly Defs (C) is updated daily and covers the time until the monthly Defs (A) and full Defs (B), the monthly Defs (A) and the full Defs (B) do not need to be updated daily.


5. Download Intervals:
LUAU will only download the Defs (A & B) monthly (this usually happens towards the End of each month).
LUAU will download the Defs (C & D & E) daily.

6. Purpose:
The monthly Defs (A):
...cover the period from the oldest available Date (one year back) until the last monthly Defs update.

The full incremental Defs (B):
...cover the period from more than one year back until the last monthly Defs update.

The incremental since the last monthly Defs (C):
...cover the period from the last monthly Defs update until the current daily Defs.

The incremental weekly and daily Defs (D):
The incremental weekly Defs cover the period from the last monthly Defs until the last current daily Defs.
The incremental daily Defs cover the period from the last weekly Defs until the last current daily Defs.

The full (non-incremental) Defs (E):
The full (non-incremental) Defs are needed for the SAV Servers only.

7. Size:
[Estimated based on current Definitions Feb. 2008, this will increase daily with new Defs]
The monthly Defs (A):
The Monthly Defs have a overall Size of around 140 MB
Each monthly has a slightly different size as it needs to cover a different Time Span.
The file for the current month is usually empty (1-2KB) as this is covered in the Defs (C & D).
The Files from last and first months are slightly smaller as well as they together kind of cover a full month again (due to the fully available 1 year back Defs based on days, not months).
The oldest monthly Defs have around 16 MB, the younger around 11MB

The full incremental Defs (B):
The full incremental Defs have around 26 MB.

The incremental since the last monthly Defs (C):
...is growing daily by about 100KB

The incremental weekly and daily Defs (D):
...have between 100 KB & 1 MB

The full (non-incremental) Defs (E):
...have around 30 MB




Technical Information
For SAV 10.x, 32 Bit, we can say that LUAU 1.5 will download daily around 35 MB.

Additionally once per month it will download another 170 MB.

For a full month LUAU will download:
(35*30)+170=1220

So around 1.3 GB.




Legacy ID



2008030613163548


Article URL http://www.symantec.com/docs/TECH104351


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