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RAID controller on board and Card

Last Modified: 2016-12-08
we have come to know that some limitation on the RAID  controller pick from the onboard and card based

we have done the test on our few servers to check the RAID is working on the define Standard . we have realized that two servers didn't work after removing one  hard disk from the RAID 1 setup  server . When I check with the vendor and replay to me that server has the entry level RAID control card and without fixing the second hard disk will not going to work . So it means it will take some to rebuild the second hard disk . till that time server not in the online mode

if I want to go with the realizable RAID .we need to have the enterprise raid controller with hot shapeable HDDs  

please comment on the above with your expertise knowledge
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