• Subject: Re: Backup on another machine - Remote Journal
  • From: Larry Bolhuis <lbolhui@xxxxxxx>
  • Date: Mon, 27 Sep 1999 10:14:30 -0400
  • Organization: Arbor Solutions, Inc


 This will depend largely on the transaction volumn.  If you have a 500Krec
inventory file where every record gets touched during an MRP run for example 
you will swamp that 64K for a looong time just for that one program.  On the
other hand if this is a small 170 or 150 with 4 or 5 users doing some inquiries
and completing packing slips in a remote warehouse then it might be no problem. 

 FInding out is really quite simple. Turn on journalling for a normal business
day.  (Remember you will probably want before AND after records in your journal
to facilitate proper updates)  Then at the end of the day see how big it is do
the math.   Remember to allow for normal traffic on the line as well.

 - Larry

Dale Pascual B Jose wrote:
> How  feasible is remote journal on a 64K line? Has anyone in this community 
> implemented it before?  Or is better to perform copying of journal receivers 
> tape regularly and restore it to a secondary system?  I understand that you 
> to have a user-written program to update the files on the secondary system 
> jrnrcvs.
> |
> Larry Bolhuis <lbolhui@ibm.net> on 09/27/99 01:13:18 AM
> I think that you will find that 64K is simply not enough bandwidth to get much
> backup done.  BEST throughput is about 50MB/Hour WITH 2 to 1 compression.  You
> can use remote journals (probably the only viable option) to get data over
> wire.   You will find that attempting to move any volumn of data, even via 
> will be DRAMATICALLY slower than almost any tape drive (yes even reel tape).
> Also if you want to keep the data in Sync between the systems you WILL need 
> of the tools.  You cannot afford to write and maintain it yourself unless you
> are
> doing very limited replication.
>  - Larry
> Dale Pascual B Jose wrote:
> >
> > What choices do I have if I want to backup my AS/400 system to another 
> > AS/400, without using expensive High Availability Solutions (such as Mimix,
> > Vision, etc.)?  The two AS/400s are connected via 64Kbps leased line.  I'd
> still
> > prefer to backup on QIC though since it is much faster, and then to 
> > restore on the other machine.  What do you think?
Larry Bolhuis         | What do You want to Reload today?
Arbor Solutions, Inc  |
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