> Qs. IF THE DATABASE CRASHES IN THE PRIMARY STORAGE ARRAY BOX , WILL IT
> BE COPIED TO THE 2nd REPLICATION ARRAY THEREBY CAUSING IT TOO HOLD A
> CRASHED COPY OF THE DATABASE TOO ?
Yes, if the filesystem replication is synchronous then the target system will have the EXACT same problems as the source. It is a direct block level replication. So even datafile corruption errors will be propagated.
SRDF is a very good backup to actual hardware failure... such as a CPU going bad.
Nick
-----Original Message-----
From: VIVEK_SHARMA [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 03, 2001 1:26 AM
To: Multiple recipients of list ORACLE-L
Subject: Disaster Recovery Fallback Sites
MY Qs. IN CAPITALS BELOW :-
Storage-Array/OS fail-over :-
--------------------------
Storage-array vendors, most notably EMC, have taken the concept of
operating system fail-over one step further. Noting the drawbacks of
clustered hardware in the area of disaster recovery and rolling
upgrades, they have taken the basic fail-over mechanism at the operating
system level, and replaced the clustered hardware concept with the idea
of replicated storage-arrays.
So, instead of clustered nodes sharing the data by sharing the same
physical disk drives, vendors such as EMC introduced storage-array
replication.
All transactions written to one storage-array would be replicated almost
instantaneously to another storage-array.
Qs. IF THE DATABASE CRASHES IN THE PRIMARY STORAGE ARRAY BOX , WILL IT
BE COPIED TO THE 2nd REPLICATION ARRAY THEREBY CAUSING IT TOO HOLD A
CRASHED COPY OF THE DATABASE TOO ?
These two storage-arrays can be geographically separated, though the
network between them must be extremely large (i.e. OC3 or higher). The
computers, then, are not clustered, and do not require the additional
hardware and operating system software to achieve clustering.
Products include EMC Symmetrix Data Replication Facility (SDRF), and
Oracle Support has white papers describing certification testing
performed using SDRF at Oracle.
> -----Original Message-----
> From: VIVEK_SHARMA
> Sent: Sunday, September 02, 2001 3:12 PM
> To: '[EMAIL PROTECTED]'; '[EMAIL PROTECTED]';
> '[EMAIL PROTECTED]'
> Subject: Disaster Recovery Fallback Sites
>
>
> Disaster Recovery Fallback Sites :-
> --------------------------------
> What are the Different Solutions/methodologies implemented ?
> Is Standby Database the best Solution ?
> What are the Harware/O.S. Solutions available ?
> Which would be better using Oracle or O.S. Solutions ?
> Any papers , Links , best practices ?
>
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--
Author: VIVEK_SHARMA
INET: [EMAIL PROTECTED]
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