RE: Disaster Recovery

["MITTELHEISSER Jean Claude" <MITTELJC@xxxxxxx>]

Hi David,

We have 92 GB usable disks filled to more than 50 %. That means our whole 
system size is closed to 50 GB. What is the size of your system ?

Thanks
Jean-Claude

-----Message d'origine-----
De : midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]De la part de
DCharmatt@xxxxxxxxxxxxx
Envoyé : mercredi 15 septembre 2004 15:43
À : Midrange Systems Technical Discussion
Objet : RE: Disaster Recovery


JCM,

What is the size of your system?  I'm curious because it would take us at 
least 14 hours to run a Save-21 using 3590 tape drives (and this is per 
partition...we have 3).  Are LTO tapes that much faster??


Thanks,

David 



"MITTELHEISSER Jean Claude" <MITTELJC@xxxxxxx> 
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09/15/2004 09:29 AM
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Subject
RE: Disaster Recovery






Hi Dan,

I agree with you if backup system is close to production one. My Save-21 
takes about 45 minutes (50 GB to a Ultrium-1 tape unit), much shorter than 
14 hours. But in my case backup system will be 400 miles away. So I have 
13 hours to sent tape to backup. It's to short. But as we have no backup 
system today, we do every night SAVSECDTA, SAVCFG and SAVLIB *ALLUSR.

Thanks.
JCM

-----Message d'origine-----
De : midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]De la part de Dan Bale
Envoyé : mercredi 15 septembre 2004 14:49
À : Midrange Systems Technical Discussion
Objet : RE: Disaster Recovery


If you've got 14-hour window every night and if a Save-21 doesn't require
any operator intervention to change tapes, why not just do a Save-21 every
night?  Or at least the SAVLIB *ALLUSR, SAVDLO, & SAV sets?  You'll have a
FAR better recovery experience than if you have to rely on restoring up to
several SAVCHGOBJ sets.  Oh, and if you use SAVCHGOBJ, you need to 
consider
what happens when objects are deleted after the last full save.  In
recovery, you'd restore the last full save, which restores the object you
deleted, but restoring the SAVCHGOBJ sets won't tell the system about the
fact that the object was deleted, will it?  Al?  Others?

Again, I just think that you'd make it much more harder on yourself if you
go with SAVCHGOBJ when you've got the time & resources to do full saves.

Just my .02,
db

> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx / MITTELHEISSER Jean Claude
> Sent: Wednesday, September 15, 2004 8:20 AM
>
> We are currently thinking about solutions to recover one or more
> AS/400. We will probably buy a new AS/400, but we don't want to
> use mirroring or external software. Knowing that AS/400 has no
> activity between 6 p.m. and 8 a.m., I'd thought using following method :
> - A total system safe ("go save" 21) on tape once a week on
> saturday morning. A copy of the tape will be sent to the backup
> by postal mail.
> - At end of each production day, save all modified objects
> (SAVCHGOBJ) and send it to backup by using file transfer.
> - 4 or 5 times a day, save the JRN files and send it to backup by
> using file transfer too.
>
> Do you think that this solution will work ? I don't have too much
> doubt about the first 2 safes, it's only a matter of volume of
> data and of network speed. But is it possible to save JRN files
> without stopping corresponding tasks and to restore them on
> backup side ? Our OS is a V4R5 on a 820 and we will surely
> migrate to a new 520 in V5R3 of course. 820 will become our
> backup machine. Does V5R3 offer new possibilities in saving and
> restoring ? Pehaps by making the things easier ?
>
> Thanks for your assistance.
> Jean-Claude Mittelheisser

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