We use compression nearly on every node.
With TSM 4.? there seems to be a significant speedgain in the compression
code.
We doing backup of a 2 TByte NAS System over GBE to a 2 Processor Compaq NT
Server (as TSM Client 4.2.1.20 - with 5 TSM nodes defined on )to MVS TSM
Server (4.1.4.2).
We reach during normal incremental 6-8 MB/sec and sometimes
during processing larger files on the filer up to 12-16 MB/sec (with
compression).
The main advantage is, that the primary diskpools on MVS are used more
efficent, since the data are compressed at about 23%. Also there is 23% less
I/O on the server.
Regards Stefan Holzwarth
> -----Ursprüngliche Nachricht-----
> Von: Gerald Wichmann [mailto:gwichman AT ATTBI DOT COM]
> Gesendet: Mittwoch, 10. April 2002 22:15
> An: ADSM-L AT VM.MARIST DOT EDU
> Betreff: Re: Compression
>
>
> Its rare we ever used client compression..
>
> Generally speaking the only time it makes sense to use client side
> compression is when you have network bandwidth concerns and want to
> reduce the load on the network (i.e. you have limited
> throughput between
> the client and server.. a laptop backing up through the internet or a
> server having to go through a slower firewall).
>
> I could also see maybe using it if your disk storage pool was
> limited in
> size and nightly backups were causing migrations to kick off
> because you
> don't have enough disk storage to hold your backups. Turning on client
> compression would pre-compress the data and would help with that.
>
> Ultimately the amount of space it uses on the tapes is going
> to be about
> the same.
>
> Gerald
>
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]
> On Behalf Of
> Spearman, Wayne
> Sent: Wednesday, April 10, 2002 12:36 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Compression
>
> Do you guys use client compression, hardware compression, or
> both? Were
> trying to decide if it's worth turning compression on at the client
> level.
> I'd think sending a compressed file to a tape drive with hardware
> compression would make the file grow, but I don't have a way of
> confirming
> that...
>
> Wayne Spearman
> Information Technology - Software Systems Engineer
> Novant Health - Central Services
> Charlotte, NC
> Phone: 704-384-7019
> Fax: 704-316-9936
> email: wmspearman AT novanthealth DOT org
>
>
>
>
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