TSM doesn't do compression on the server side other then what the tape
drives themselves are capable of. And in that case the compression (and
decompression) is done by the hardware on the tape drives and therefore has
no impact on your TSM server. Thus points 1 and 2 below aren't valid..
Points 3 and 4 are valid though and in my opinion the main "pros" of doing
client-side compression. Add to those points the fact that less data is
transferred over the network which might be desirable if a network is
already fairly loaded (usually not the case) or slow (mobile backups via the
internet and whatnot).
The con's of doing client-side compression are primarily that they impact
the client computers a great deal (in my experience). Particularly NT
systems.. It also significantly impacts overall backup and restore times
which for the most part is unacceptable in my opinion.
Keep client-side compression off unless you have a valid reason to have it
on.. my two cents
Gerald Wichmann
RS Engineer
Sansia System Solutions
408-844-8893 work
408-844-9801 fax
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Joe
Faracchio
Sent: Friday, October 06, 2000 4:13 PM
To: [EMAIL PROTECTED]
Subject: Re: compression
I say client.
<Begin Religious Argument>
Here's why:
1) outboard the cycles
My ADSM server has enough to do. If it get someoneelse to do
the work so be it. (Can you say SETI! :) )
2) less work when reclamating, no?
Doesn't a compressed on the tape / compress by the server
file have to be un-compressed during data movement?
3) better/accurate reporting of tape utilization
I like the fact that my tapes report native amounts of
utilization. I know a 90% util tape is 90% and not 45%
4) less disk space.
The compression occurs on the tape so before that its wasted
space.
<End Religion>
... joe.f.
Joseph A Faracchio, Systems Programmer, UC Berkeley
On Thu, 5 Oct 2000, Selva, Perpetua wrote:
> Is it better to compress data from the client or from the server.
>
> Please let me know
> Thanks
>
> Perpetua Selva
> ARBC Dominion Securities Inc.
> Technical Analyst
> Global Markets
> Tel: (416-842-4528)
> Fax:(416-842-4335)
>
