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How many individually functioning EBS drives ( non-raided ) can I connect to a single Amazon EC2 server running Linux CentOS? I can't find a value in the EC2 or EBS manuals. Are there any other drive limitations I should be aware of with EBS?

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Some people have been able to attach 40 EBS devices to the same instance using RAID (see http://alestic.com/2009/06/ec2-ebs-raid)

You could probably attach more than 40, but be aware of the device names limitations, since according to EC2 documentation these are the only devices available for external EBS drives on Linux instances running xvd drivers:

/dev/sd[f-p]
/dev/sd[f-p][1-6]
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The current device attachment limits are described at http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html and for the currently most typical HVM instance types they include:

/dev/sd[a-z]
/dev/xvd[b-c][a-z]

Meaning the limit is way beyond what it was in 2012.

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