One very basic question on Shared Storage

For setting up 11GR2 in Sun 5.10 SPARC, our sys admins have allocated block devices in shared storage and they sent us a mail mentioning the disks. This is what their mail looks like
Storage attached to Node1
/dev/rdsk/c4ikdzs3
/dev/rdsk/c4ikdzs4
.Storage attached to Node2
/dev/rdsk/c5ikdzj2
/dev/rdsk/c5ikdzj5
.When i logged in to Node1:/dev/rdsk , i can only see
/dev/rdsk/c4ikdzs3
/dev/rdsk/c4ikdzs4
.as they have mentioned. Same for Node2
But, all the raw devices mentioned above should be visible from either node's /dev/rdsk. Right? Isn't that whole point of RAC; Shared storage ?

resistanceIsFruitful wrote:
But, all the raw devices mentioned above should be visible from either node's /dev/rdsk. Right? Isn't that whole point of RAC; Shared storage ?Not exactly if you are referring to device names..
Each kernel will do a h/w discovery when booting. When dealing with LUNs via a HBA (or similar), there's absolutely no guarantee that the kernels will detect the LUNs in the same sequence and assign the same scsi device names to these. A LUN can be called device-foo-1 on one server and device-foo-21 on another.
Also, many HBAs will be dual port and running dual fibre channels. So not only is the same LUN seen as a different scsi device by each kernel, but it is seen more than once. So device-foo-1 and device-foo-33 can be the same physical LUN on server 1.
To deal with this a logical device name is needed. This will be the same device name on all servers - and it will in turn transparently support the multiple I/O paths to the LUN. This is done by "special driver" software looking at the scsi disk's unique signature - called a WWID or World Wide Name. With that unique signature, the s/w can uniquely recognise a specific LUN, irrespective of which server the s/w runs on.
This s/w is called Multipath on Linux, Powerpath by EMC and so on. I would expect that you will have something similar on your servers.
The actual scsi device mapped by the kernel to the LUN is not used. In the case of multipath for example, one will use the relevant +/dev/mpath/mpath<n>+ devices. In the case of Powerpath, these will be +/dev/emcpower<driveletter>+ devices.
These are the device names that you will use for 11g Grid Infrastructure and Oracle ASM and RAC setup and configuration as shared storage.

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Can any one please explain why we are using inheritance instead of creating object of base class????

SumitThokal wrote:
One very basic question about inheritance.
Why we need inheritance?
the benefit of inheritance also achieve by creating instance of base class using it in other class instead of extending the base class.
Can any one please explain why we are using inheritance instead of creating object of base class????What did you find out when you looked on Google?
One example of inheritance comes in the form of a vehicle. Each vehicle has similarities however they differ in their own retrospect. A car is not a bus, a bus is not a truck, and a truck is not a motorbike. If you can define the similarities between these vehicles then you have a class in which you can extend into either of the previous mentioned vehicles. Resulting in a reusable class, dramatically reduces the size of code, creates a single point of definition, increases maintainability, you name it.
In short there are thousands of benefits from using inheritance, listing the benefits could take a while. A quick Google search should give you a few hundred k if not million links to read.
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G

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http://www.oracle.com/oramag/profit/07-may/p27anniv_timeline.pdf
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