RE: Falconstor/IPStor with Clariion, EMC Timefinder with Symmetrix

  • From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Wed, 24 Mar 2004 12:27:01 +0100

Carel-Jan,

the *one and only* reason why you need to put Oracle data files in backup
mode is to avoid fractured blocks -- that is, ending up with Oracle blocks
(spanning multiple OS blocks) with the header and footer out of sync.
I don't know the technology of "snapshotting" all data files in a single
atomic action -- sounds interesting to me... how do they do this? be
careful, this might be marketing language, with some vipers under the grass
;-)

anyway, if it is really true that they can guarantee this "atomic
snapshotting" you would be able to do hot backups without the need to put
your tablespaces or data files in backup mode. By the way, you don't really
need it at the database level; at the data file level it is good enough.

Whether this is supported, that's another story.

Cheers,
Lex.

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Carel-Jan Engel
Sent: woensdag 24 maart 2004 10:12
To: oracle-l@xxxxxxxxxxxxx
Subject: Falconstor/IPStor with Clariion, EMC Timefinder with Symmetrix


Hi list,

Does anyone know these products for HA-solutions? Especially, is it
possible/certified to snapshot databases without putting the database in
backup mode?

The idea behind it is that all datafiles (incl. control and online
redolog) are snapshotted in one single atomic action. The snapshot is
stored at a local mirror, and asynchronously transferred to the DR-site.
Failover can be performed by starting and (auto)recovering the database at
the DR site. Because all files were copied in the state they were in one
point in time, starting the database at the remote site should be the same
as starting a database after a power failure.

I'm not interested in all kinds of other HA solutions, the site I'm
currently working for has implemented these solutions, but needs
verification. It's hard to get commitment from the vendors that their
products are certified for Oracle, although they advised and sold the
solution :-(.


Thanks, Carel-Jan

===
If you think education is expensive, try ignorance. (Derek Bok)
===


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