RE: Compressing BPCS Data

["Gary Ackland" <ackland@xxxxxxxxxxxxxxx>]

It is possible to compress data on the AS/400, but you need to have a couple
conditions:

1) The compression is done at the IOP/adapter level, so the IOP and OS/400
level (V3R7 and above) must have the capability of compressing.

2) All data below the adapter are compressed, not on a library or record
level.

3) Best implementation is done in a separate ASP (Auxiliary Storage Pool).


Performance is not bad, most new AS/400 disk technology has 4-6ms (thousand
of a second) response time, with compression, the disk performance slows to
8-10ms.  Much faster than tape or optical. The compression for disk is the
same compression technology used in the 3590 tape drives, so you should get
a 1:2-1:3 compression rate. And yesterday IBM cut their Disk prices on the
AS/400 by 30%.

This is a good solution if you regularly go back into older year's
transaction data.  Move that year's entire library into the secondary ASP
and compress it.  Keep year 2-7 on compressed disk, while keeping newer data
on the higher performing disk.

I think IBM was brought or will bring to BRMS (Back-up & Recovery Media
Services), the ability to track data moved to a secondary ASP's too.

-----Original Message-----
From: owner-bpcs-l@midrange.com [mailto:owner-bpcs-l@midrange.com]On
Behalf Of Chick Doe
Sent: Thursday, October 19, 2000 5:12 PM
To: BPCS-L@midrange.com
Subject: Re: Compressing BPCS Data


i have no idea about the cost, or whether it would even work on your as/400.
The as/400 has hardware compression capabilities. if you segregated the
files that you wanted compressed you can specify that they be placed on
'compressed drives' versus normally uncompressed drives. again, i do not
know the specifics of what hardware /software / operating system is
required?

>>> RickCarter@holley.com 10/19/00 12:40PM >>>
BPCS 6.1 Mixmode  AS400
Is anyone running inexpensive compression software on their AS400.  Due to
access reasons, I have some archived BPCS data that I would like to leave
on the system but would like to zip it up or compress it someway.  I've
looked at PKZIP AS400 but it is quite expensive for my limited need.  Any
other suggestions other than moving to a savefile and / or saving to tape.

Thanks

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