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RAJ54

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71 Posts

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July 2nd, 2021 14:00

Global hotspare with two lsi raid controllers

I have two LSI raid controllers on my Dell Server.    They both show up on my MegaRaid Storage Manager.  

4 Drive Raid 10 on each controller (one is a external drive box)

I take it I would need one HOT spare per controller.

Also why would I want a dedicated spare over a global? 

Lets say I have two raid 10  4 drive sets on a controller.   A Global would cover either raid 10 set right?   If I chose dedicated then one raid gets left out. 

For just a one raid 10 4 drive set how is dedicated any different than global?   They both would auto take over in case of a failure on the array.    Seem they would be the same in this situation.  Or maybe not.   I've not tested it in action yet.

Just trying to understand what will actually happen in each situation if I have a drive failure.  Thanks

 

 

DELL-Young E

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5.4K Posts

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July 4th, 2021 17:00

  1. A global spare disk is a redundant disk that can automatically take the place of a failed disk in any volume.

->the disk can be used for the controller’s all VDs.

 

  1. A dedicated hot spare is a hot spare disk that can only be used for one redundant virtual disk. And automatically replaces a failed physical disk only in the selected disk group which the hot spare is part of. A dedicated hot spare is used before a global hot spare is used.

->the disk can only be used for Assigned VD.

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