Data migration 
Author Message
 Data migration


Quote:

>I am going to move a 300G+ Informix database from one system to another,
>and due to several constraints (that I am not pleased about but must
>deal with), I am thinking of doing a dd copy from one set of disks to
>another. Has anyone ever done this before and survived?

Don't even think about it.

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Wed, 18 Jun 1902 08:00:00 GMT
 Data migration

Why not?
I (used to) have 1 raw partition of 1G on 2G scsi disk on solaris 2.5 when
boot disk crashed.
That was development environment so I didn't have last backup.
I just dd that partition to file on another machine (other solaris, other
DS, other disk...)
and do some hacking (I forgot what) and I was able to save ALL of data.
JS



Quote:


> >I am going to move a 300G+ Informix database from one system to another,
> >and due to several constraints (that I am not pleased about but must
> >deal with), I am thinking of doing a dd copy from one set of disks to
> >another. Has anyone ever done this before and survived?

> Don't even think about it.

____________________________________________________________________________
_________
Quote:
> Get more from the Web.  FREE MSN Explorer download :

http://explorer.msn.com


Wed, 18 Jun 1902 08:00:00 GMT
 Data migration

Bully for you.


Quote:

>Why not?
>I (used to) have 1 raw partition of 1G on 2G scsi disk on solaris 2.5 when
>boot disk crashed.
>That was development environment so I didn't have last backup.
>I just dd that partition to file on another machine (other solaris, other
>DS, other disk...)
>and do some hacking (I forgot what) and I was able to save ALL of data.

You forget what, eh?

Quote:



> > >I am going to move a 300G+ Informix database from one system to
>another,
> > >and due to several constraints (that I am not pleased about but must
> > >deal with), I am thinking of doing a dd copy from one set of disks to
> > >another. Has anyone ever done this before and survived?

> > Don't even think about it.

>____________________________________________________________________________
>_________
> > Get more from the Web.  FREE MSN Explorer download :
>http://explorer.msn.com

_____________________________________________________________________________________
Get more from the Web.  FREE MSN Explorer download : http://explorer.msn.com


Wed, 18 Jun 1902 08:00:00 GMT
 Data migration


Quote:

>Why not?

"Mwahahahahahahahahahahahaha!!!"

...is what Tech Support will say if anything goes wrong and you call them
up, is about the best reason I can think of.

Quote:
>I (used to) have 1 raw partition of 1G on 2G scsi disk on solaris 2.5 when
>boot disk crashed.
>That was development environment so I didn't have last backup.
>I just dd that partition to file on another machine (other solaris, other
>DS, other disk...)
>and do some hacking (I forgot what) and I was able to save ALL of data.
>JS




> > >I am going to move a 300G+ Informix database from one system to
>another,
> > >and due to several constraints (that I am not pleased about but must
> > >deal with), I am thinking of doing a dd copy from one set of disks to
> > >another. Has anyone ever done this before and survived?

> > Don't even think about it.

>____________________________________________________________________________
>_________
> > Get more from the Web.  FREE MSN Explorer download :
>http://explorer.msn.com

_____________________________________________________________________________________
Get more from the Web.  FREE MSN Explorer download : http://explorer.msn.com


Wed, 18 Jun 1902 08:00:00 GMT
 Data migration


Quote:


> >Why not?

> "Mwahahahahahahahahahahahaha!!!"

> ...is what Tech Support will say if anything goes wrong and you call
them
> up, is about the best reason I can think of.

Why would they laugh?  Using dd seems to be a perfectly legitimate way
to move the data if it is done competently.

If I have a set of disks set up so I can swing them over to another
machine and bring up the instance would they laugh then?  How is this
different?

I can understand you saying whether or not you are competent enough to
use dd is not Informix Tech support's responsibility, and I will agree.
 But as long as your media is good and you set up your other server
properly, dd will work fine and in some situations might even be
appropriate.

Will

Sent via Deja.com http://www.deja.com/
Before you buy.



Wed, 18 Jun 1902 08:00:00 GMT
 Data migration


Quote:




> > >Why not?

> > "Mwahahahahahahahahahahahaha!!!"

> > ...is what Tech Support will say if anything goes wrong and you call
>them
> > up, is about the best reason I can think of.

>Why would they laugh?  Using dd seems to be a perfectly legitimate way
>to move the data if it is done competently.

Mmmm...sure. I think the key is "if it is done competently". Which is
outside Informix's control.

Quote:
>If I have a set of disks set up so I can swing them over to another
>machine and bring up the instance would they laugh then?  How is this
>different?

>I can understand you saying whether or not you are competent enough to
>use dd is not Informix Tech support's responsibility, and I will agree.
>  But as long as your media is good and you set up your other server
>properly, dd will work fine and in some situations might even be
>appropriate.

Well, I spend my life with customers for whom "supportability" is mandatory.
If you don't care, you can do whatever you like.
_____________________________________________________________________________________
Get more from the Web.  FREE MSN Explorer download : http://explorer.msn.com


Wed, 18 Jun 1902 08:00:00 GMT
 Data migration


Quote:





> > > >Why not?

> > > "Mwahahahahahahahahahahahaha!!!"

> > > ...is what Tech Support will say if anything goes wrong and you
call
> >them
> > > up, is about the best reason I can think of.

> >Why would they laugh?  Using dd seems to be a perfectly legitimate
way
> >to move the data if it is done competently.

> Mmmm...sure. I think the key is "if it is done competently". Which is
> outside Informix's control.

> >If I have a set of disks set up so I can swing them over to another
> >machine and bring up the instance would they laugh then?  How is this
> >different?

> >I can understand you saying whether or not you are competent enough
to
> >use dd is not Informix Tech support's responsibility, and I will
agree.
> >  But as long as your media is good and you set up your other server
> >properly, dd will work fine and in some situations might even be
> >appropriate.

> Well, I spend my life with customers for whom "supportability" is
mandatory.
> If you don't care, you can do whatever you like.

________________________________________________________________________
_____________
Quote:
> Get more from the Web.  FREE MSN Explorer download :

http://explorer.msn.com

Supportability is mandatory.  If dd doesnt work, I will go to the O/S
vendor.  If I am not competent enough to use dd, then it is my own
problem.

If I using a hot swappable disk array, and I end up getting an I/O error
when swapping out the drives, I do not expect informix to support that
either.  It is transparent to informix, so why involve them?  Doesn't
mean I won't let drives be hot swapped on my system, or that swapping
the drives hot is unsupported.

Will

Sent via Deja.com http://www.deja.com/
Before you buy.



Wed, 18 Jun 1902 08:00:00 GMT
 Data migration


Quote:


>Supportability is mandatory.  If dd doesnt work, I will go to the O/S
>vendor.  If I am not competent enough to use dd, then it is my own
>problem.

  Some customer will say it is Informix's problem and that Informix
  does not work!

Quote:
>If I using a hot swappable disk array, and I end up getting an I/O error
>when swapping out the drives, I do not expect informix to support that
>either.  It is transparent to informix, so why involve them?  Doesn't

  The error message comes from informix so users assume Informix
  is at fault.

Quote:
>mean I won't let drives be hot swapped on my system, or that swapping
>the drives hot is unsupported.

>Will

>Sent via Deja.com http://www.deja.com/
>Before you buy.

--
David Williams


Sat, 24 May 2003 08:32:40 GMT
 Data migration


Quote:





> >Supportability is mandatory.  If dd doesnt work, I will go to the O/S
> >vendor.  If I am not competent enough to use dd, then it is my own
> >problem.

>   Some customer will say it is Informix's problem and that Informix
>   does not work!

> >If I using a hot swappable disk array, and I end up getting an I/O error
> >when swapping out the drives, I do not expect informix to support that
> >either.  It is transparent to informix, so why involve them?  Doesn't

>   The error message comes from informix so users assume Informix
>   is at fault.

> >mean I won't let drives be hot swapped on my system, or that swapping
> >the drives hot is unsupported.

It's like anything really. Informix might think that Will is perfectly
capable of running tbzero for himself. Does that mean Informix should
support any user running tbzero?

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Wed, 18 Jun 1902 08:00:00 GMT
 Data migration

Jim,

We just migrated 1.1 TB from an EMC3700 to an EMC8730 using dd without
incident.

Scott H.

Quote:
> -----Original Message-----

> Sent:      Thursday, November 30, 2000 5:29 PM

> Subject:   Data migration

> I am going to move a 300G+ Informix database from one system to another,
> and due to several constraints (that I am not pleased about but must
> deal with), I am thinking of doing a dd copy from one set of disks to
> another. Has anyone ever done this before and survived?

> Examples of constraints: one tape drive (very long back/restore time),
> don't have a set of disks large enough to hold the DB for the
> intermediate step of dbexport/dbimport.

> Sent via Deja.com http://www.deja.com/
> Before you buy.



Wed, 18 Jun 1902 08:00:00 GMT
 
 [ 10 post ] 

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