In message <[email protected]>,
Manu Fernandes <[email protected]> writes
Hi,
Under Universe/Linux we use Data Replication Block Device. www.drbd.com (open
source linux product)
A low level software called between logical partition and hdd partition.
Cluster over LAN.
We define it on partitions where Universe db is installed (including universe
himself).
On the hot-standby server, the same partition is created and not mounted
(universe is not started ~ for this raison, we don't need IBM's license)
On fail-over, we switch the ip adress to the hot-standby server, we mount the
partition, we boot uv and users can work ... 2 minutes.
One restriction, we don't use DYNAMIC files because the headers are not
permanently flushed when write occurs files.
I believe (iirc) IBM have confirmed that, as of the latest versions of
UV, the headers are flushed when they are updated so dynamic files are
now safe ...
Coupled with Universe Transaction Logger set on strategic files to ensure "record
update integrity".
My two pence.
Manu
Cheers,
Wol
--
Anthony W. Youngman <[email protected]>
'Yings, yow graley yin! Suz ae rikt dheu,' said the blue man, taking the
thimble. 'What *is* he?' said Magrat. 'They're gnomes,' said Nanny. The man
lowered the thimble. 'Pictsies!' Carpe Jugulum, Terry Pratchett 1998
Visit the MaVerick web-site - <http://www.maverick-dbms.org> Open Source Pick
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