We are using client compression for backup of a 1,5 TByte NAS system.(F760) (reason is to have apparently larger disk storage pools) Backup is done using 5 different nodes on the same machine (Dual 1 GHz P3) to have the opportiunity to restore with 5 sessions. During backup i can see about 3-4 MByte per second on the network to the TSM-server on MVS. Restoretests for the netapp system seem to have a limit with this compressed data at 8-9 MB per second. (only if tapes 3590-B a filled well) At this speed (can be observed over a longer period) TSM client and NAS system have nearly 100% CPU load. The data a typical userdata - many small and some large
Regards, Stefan Holzwarth > -----Ursprüngliche Nachricht----- > Von: Sotonyi Attila [mailto:[EMAIL PROTECTED]] > Gesendet: Mittwoch, 9. Januar 2002 12:29 > An: [EMAIL PROTECTED] > Betreff: Re: Client Compression question > > > HI, > > With many small files this performance is not quite bad, but I think > you should tuning you system. What kind of library you're using? Is > compression set to enabled at drive and client level? If yes do not > use this. > > Üdv, > Sótonyi Attila mailto:[EMAIL PROTECTED] Certified TSM 4.1 admin MÁV Informatika Kft. Tel.:06(1)457-9372 ------------------------------------------------------------ > Hi. > I have been testing Novell backups and restores using a Compaq proliant 8500 as > the client > box. > We have been seeing ok performance of approx 10 gb an hour for backups and > restores, > of 1 million objects. > This applies both to Netware compressed and Netware uncompressed volumes. > However when I try TSM client compression on a backup of a netware uncompressed > volume, the performance drops to 1 gb. an hour. > It is not a resource problem the compaq cpu is hardly stirring, but it is > definitely the TSM compression that is taking up the time (TSM tracing shows it > as 89% of the total time) > I always believed in the past that slow performance with client compression was > down to > lack of cpu on the client box, but there is cpu to spare with this > configuration. > My question is :- > Is 1 gb an hour the best performance I that I can expect using TSM compression > or can anyone think of reasons why that is all I am achieving ? > thanks > ********************************************************************** > The information in this E-Mail is confidential and may be legally > privileged. It may not represent the views of Scottish and Southern > Energy plc. > It is intended solely for the addressees. Access to this E-Mail by > anyone else is unauthorised. If you are not the intended recipient, > any disclosure, copying, distribution or any action taken or omitted > to be taken in reliance on it, is prohibited and may be unlawful. > Any unauthorised recipient should advise the sender immediately of > the error in transmission. > Scottish Hydro-Electric, Southern Electric, SWALEC and S+S > are trading names of the Scottish and Southern Energy Group. > **********************************************************************
