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 > -----Urspr�ngliche Nachricht----- > Von: Gerald Wichmann [mailto:[EMAIL PROTECTED]] > Gesendet: Mittwoch, 10. April 2002 22:15 > An: [EMAIL PROTECTED] > 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:[EMAIL PROTECTED]] > On Behalf Of > Spearman, Wayne > Sent: Wednesday, April 10, 2002 12:36 PM > To: [EMAIL PROTECTED] > 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: [EMAIL PROTECTED] > > > > > This message and any included attachments are from NOVANT HEALTH INC. > and are intended only for the addressee(s). The information contained > herein may include trade secrets or privileged or otherwise > confidential > information. Unauthorized review, forwarding, printing, copying, > distributing, or using such information is strictly prohibited > and may be unlawful. If you received this message in error, or have > reason to believe you are not authorized to receive it, > please promptly > delete this message and notify the sender by e-mail. > > Thank you. >
