Re: AIX to Linux

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Tue, 27 Oct 2015 09:27:50 -0600

Shameless plug follows, but hey! it's definitely relevant...

Delphix data virtualization also supports (and improves upon) cross-platform provisioning (a.k.a. UNIX-to-Linux or "U2L").

Cross-platform provisioning has an initial validation step that requires the use of the DBMS_TDB.CHECK_DB procedure against a READ ONLY database. Since I'm betting that you can't set your production database to READ ONLY even for a moment, this would necessitate creating a copy of that 100TB database so that you can do so. Creating a 100TB virtual database is a whole lot faster and easier than creating a 100 TB physical database, and setting that virtual database to READ ONLY has no impact on production.

In the same way, after the validation (presumably) succeeds and during conversion, Delphix automates the steps of creating a virtual database to act as a READ ONLY source and then also automates and orchestrates the transportable tablespace (TTS) operations for the RMAN CONVERT DATAFILE to create a virtual Linux database. Both virtual databases (i.e. source and target) take up practically no space even with the endian-conversion, but the two longest-running operations are the TTS metadata export/import (which is single-threaded through Data Pump) and the RMAN CONVERT DATAFILES themselves, which are parallelized but still involve copying every bytes of database from source to target.

Data virtualization works really well for creating test images of the converted Linux database to test the migrated application. For doing the final cutover of AIX to Linux, data virtualization can also "re-hydrate" a physical copy from the converted virtual copy, but for some requirements this may be an overly lengthy process.




On 10/26/15 23:58, Oracle List (Redacted sender sharmakdeep_oracle for DMARC) wrote:

What are some of the options of migrating version 11.2.0.4 DB, 100TB sized
database from AIX to Linux. This question relates to only Storage element, like
Endian conversion.

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