On Tue, 30 Sep 2003 11:14:21 +0100
David McClelland <David.McClelland AT REUTERS DOT COM> wrote:

> Hi list,
>
> Understandably, one of our customers is concerned about the impact of
> enabling TSM journaling on his customer-facing performance-critical
> production file-server - he asks:
>
> >> Do you know if there is any risk of performance degradation (i.e.
> slower read/write of files)
> >> resulting from the interaction between the journaling daemon and the
> Win32 API?
>
> Does anyone have any comments, experiences or statistics that I can get
> back to him with on this? I can understand that there might be a
> performance hit, what with the extra file I/O and writes to the journal
> file, but is this significant or quantifiable, and should he be
> concerned?
>

I think there should not be a real problem. On a number of selectable events
(Delete, File Size, last modification timestamp, last access timestamp,
Atributes, NTFS security) a event is logged in the TSM journal. The default
settings seem logical, and will not give you a lot of overhead. Having the
TSM journals on a separate disk will of course help if you have a really
busy server...

It is not true that on every access to a file an event is logged, so you
need not worry to much....


> Many thanks,
>
> David McClelland
> Management Systems Integrator
> Global Management Systems
> Reuters
> 85 Fleet Street
> London EC4P 4AJ
>
> E-mail  david.mcclelland AT reuters DOT com
> Reuters Messaging       david.mcclelland.reuters.com AT reuters DOT net
>
>
>
>
> -------------------------------------------------------------- --
>         Visit our Internet site at http://www.reuters.com
>
> Get closer to the financial markets with Reuters Messaging - for more
> information and to register, visit http://www.reuters.com/messaging
>
> Any views expressed in this message are those of  the  individual
> sender,  except  where  the sender specifically states them to be
> the views of Reuters Ltd.


--
Met vriendelijke groeten,

Remco Post

SARA - Reken- en Netwerkdiensten                      http://www.sara.nl
High Performance Computing  Tel. +31 20 592 8008    Fax. +31 20 668 3167

"I really didn't foresee the Internet. But then, neither did the computer
industry. Not that that tells us very much of course - the computer industry
didn't even foresee that the century was going to end." -- Douglas Adams