>> On Thu, 10 Sep 2009 16:35:07 +0200, Remco Post <r.post AT PLCS DOT NL> said:


> On 10 sep 2009, at 15:48, Gennadiy Khramov wrote:

>> Hi, may someone tells - is any differences between TSM HSM (for
>> Windows) and TSM for Space Management (for Unix) in work with
>> files/filesystems?

> From the perspective of the filesystem, and the user there is very
> little difference. Oddly, from the perspective of TSm there is a
> huge difference. Where HSM for Unix uses the HSM interface to TSM,
> all windows HSM clients use TSM archiving.



Search the archives for my rants on this.

I think the Windows HSM product is misnamed and horrible.

You'll back up new versions of your files every time a file is
retrieved.

You'll re-archive files every time a file is "migrated to tape".

You'll re-backup files every time a file is migrated to tape: this
means that your active backup copy is the stub, not the full file.


Consequently, if you fotch your archive settings, the backup is no
good: you'd have a backup of a stub which could have itself fallen off
the end of archive retention.  Way to silently lose all your data.




- Allen S. Rout