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karthik_m03
1 Copper

Hello everyone ,

I Wonder if someone could give me  good insights about ho the RAIN concept works in  ISILON X410 Nodes & HD 400 Nodes.

am unclear about the how the RAIN works in  nodes when for a instance (node failure , HDD failure ).


0 Kudos
2 Replies

Re: Hello everyone ,

RAIN?  RAIN is a reference to an old Centera term, it has no relation to how Isilon protects data. 

It stood for:

Redundant

Array

of

Independent

Nodes

So you would say that data on Centera was protected with RAID (within each node) + RAIN (vertically across nodes), with either CPM or CPP protection (Mirroring or Parity). 

All of that said, data on Isilon is protected with Erasure coding.  To learn more about erasure coding, look up Reed-Solomon and/or Erasure Coding.  You might want to take an Isilon basic admin class to learn more.

https://en.wikipedia.org/wiki/Erasure_code

~Chris

Peter_Sero
3 Zinc

Re: Hello everyone ,

In addition to Chris' explanation, you might find this white paper useful:

https://www.emc.com/collateral/hardware/white-papers/h10588-isilon-data-availability-protection-wp.p...

-- Peter

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