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 th=
e
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
> -----Urspr=FCngliche Nachricht-----
> Von: Sotonyi Attila [mailto:sotonyi AT MAVINFORMATIKA DOT HU]
> Gesendet: Mittwoch, 9. Januar 2002 12:29
> An: ADSM-L AT VM.MARIST DOT EDU
> 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.
>
> =DCdv,
> S=F3tonyi Attila
mailto:sotonyi AT mavinformatika DOT hu
Certified TSM 4.1 admin
M=C1V Informatika Kft.
Tel.:06(1)457-9372
------------------------------------------------------------
> Hi.
> 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 backup=
s
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 i=
t
is
> definitely the TSM compression that is taking up the time (TSM tracin=
g
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
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