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What can I do to attempt to recover the files? Stop what you are doing. Power off the server. Remove the hard drives and ship them off to a professional data recovery shop. Period, full stop. You haven't a clue how exactly it was configured before, and anything more you do to it will cause further issues. I've had an idea of reconfiguring the RAID ...


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In terms of sequential performance, for both read and write, RAID10 of four drives behaves exactly as RAID0 of two drives. You are seeing that yourself with just two drives blinking. That is the expected behavior. It is so, because RAID1 in standard configuration does not increase sequential read speed. (been wondering about the same thing about 11 years ...


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If you want safety then don't use RAID 0, software RAID 0 will survive system crash. More important question is how file system integrality will look like after crash, for example under default configuration ext4 with journal and write barriers is quite safe. During unexpected reboot it's possible that you will lose not committed data (so called dirty pages ...



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