| mr_mehraboon |
Posted: Apr 28, 2007 07:42:31 PM |
Total Post: 7
Joined: Feb, 2007
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Hi guys,
Can someone help me on getting my head around the concept of shared disk in clustering environment!
First of all I know what RAID and file server are...
Q: when we say we have oracle RAC accessing shared disk like veritas, does this mean shared disk is physically attached to one of the oracle servers or any other box like a file server on the network? If yes then will oracle instance be consuming the CPU & Memory of that server every time it writes or read data from files on the shared disk?
What is direct read write?
The main question is: its possible for the sever hosting shared disk to be a bottleneck? And how can we cluster more than one OS to host the shared disk?
thanks |
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 Vigyan |
| Posted: Apr 28, 2007 11:06:17 PM |  |
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Total Post: 386
Joined: May, 2001
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Shared file system can be a SAN or NAS. Think about a NFS file system that is mounted on your database servers and your database server has all the data, control and redo log files.
The filesystem I/O play a very important role in a cluster environment. Oracle does not accept 20 ms for tablespace I/O.
Hope it helps.
Thanks,
Vigyan
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| mr_mehraboon |
| Posted: Apr 29, 2007 08:14:19 AM | |
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Total Post: 7
Joined: Feb, 2007
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can hard disk/shared disk be connected to more than one OS ? and both have direct access to it ?
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| mr_mehraboon |
| Posted: Apr 29, 2007 08:21:58 AM | |
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Total Post: 7
Joined: Feb, 2007
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check the link below, look at the image where it says Cluster File System
how are those boxes connected to the disk physically ? all 3 have direct access to all ? or that disk is pyisically connected to one box ?
how do they inform each other about who is writing what to the disk ? ist through network card?
http://www.stalker.com/notes/SFS.html
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| Vigyan |
| Posted: Apr 30, 2007 07:10:18 AM | |
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Total Post: 386
Joined: May, 2001
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These are IP based using network card.
Thanks,
Vigyan
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