Stefan, Are those backup/restore speeds you have quoted the total for all 5 nodes or are they what you see for each individual session. Is your network 100 megabits or gigabit. regards John
Stefan Holzwarth <[EMAIL PROTECTED]> on 01/09/2002 11:56:23 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: (bcc: John Naylor/HAV/SSE) Subject: AW: Client Compression question ********************************************************************** 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. **********************************************************************
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. > **********************************************************************
