I am having a little bit of confussing in raid(Redundant array of Inexpensive disks). The basic idea of RAID was to combine multiple small, inexpensive disk drives into an array of disk drives which yields performance exceeding that of a Single Large Expensive Drive.In Linux how internally it will do?. Can I call this as hardware cluster.Can any one plz help me regarding this.
Thanx in advance.
That's a tall order! I bet u haven't burned the midnight oil so I will just give u some pointers.
1. Read the HOWTO's. Look up LDP.
2. RAID levels
L0 = Stripping, min. 2 nos HDD, Redundancy none, Space utilization 100%, Write speed normal, Read speed more.
L1 = Mirror, min. 2 nos HDD, Redundancy Yes, Space utilization 50%, Write speed normal, Read speed more.
L3 = Stripping w/ dedicated parity, min. 3 nos HDD, Redundancy some, Space utilization 2/3, Write speed normal, Read speed more.
L5 = Stripping w/ distributed parity, min. 3 nos HDD, Redundancy max, Space utilization 2/3, Write speed normal, Read speed normal.
Combinations of the above can also be implemented depending on the capabilities of the RAID controller. The main idea is to provide redundancy and L5 gives you the best. In some cases where read speed has to be maximum L0 is used.
3. OS implementations
Linux, WinNT & others can implement L1 & L5. This is called software RAID but puts a load on the CPU processing power. In Linux you have to create RAID during installation and then mount the partitions. A dedicated RAID card gives u better performance but costs more. Using a RAID card u have to create the RAID through it's control panel and then install the OS.
I hope that should get u going.
Regards
Ami
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