What do you mean by "prefer"? if you are talking about the time taken to get
the data on to tape, then yes, large objects generally steam better than
small ones, which is why ADSM supports the concept of storage pools and
migration pools.

However, this is also a consideration of how you want to restore objects. If
you need to restore only a small amount generally (say a customers details)
then why restore a whole batch of customers? So it really comes down to what
you are trying to achieve.

We have a program (DB*Archiver) which extracts logical objects from
relational database for long term archival. At present, it does this using a
single large archive file for each run. What we are in the process of doing
is changing this to use a much smaller file for each logical grouping of
objects (say a group of customers, and all their related data). This is so
we can make use of high speed tape devices such as the 3590 with its mid
point load capability.

So, in fact, for applicatio reasons we are going to smaller objects!

_________________________________________________________________________
Adrian P Challinor                                 Osiris Consultants Ltd
                                        The Database Archival Specialists
e-mail: Adrian.Challinor AT osiris.co DOT uk
www: http://www.osiris.co.uk

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Bill Colwell
> Sent: 29 April 1998 17:24
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Which is better?
>
>
> I am submitting this for the person named below.  He is having
> trouble accessing the list.
>
>  Hi Group,
>
>  We have a dilemma(sp)...
>  I hear that ADSM prefers fewer larger objects rather than many smaller
> ones.
>  If our system design requires that we backup many many small files
> throughout
>  the day, what are the issues???
>  Please advise to group or for faster response email me directly to id
> below.
>
>  Thanks,
>  Mario Jones
>  FedEx EDI Network
>  marioj AT fedex DOT com
>  901-224-9175
>