[dm-crypt] dm-crypt + mdadm

Adam Boyhan adamb at medent.com
Fri Nov 22 17:29:57 CET 2013

Doing allot of testing with dm-crypt and mdadm. Running into an issues which is killing me. We run a standard CentOS6 load with kernel "2.6.32-358.23.2.el6.x86_64" 

Scenario #1: mdadm raid10 -> dm-crypt -> ext4 
Scenario #2: dm-crypt -> mdadm raid10 -> ext4 

Scenario #1 has no issues and runs reliably but takes a significant hit in performance due to the single threaded nature of kryptd. I read quite a bit about people instead encrypting each block device then putting software encryption on that. This all goes well until I start to benchmark. The writing process of the benchmark goes well, as soon as I hit the read portion of the test, the machine panics and locks up. I initially tested this idea with raid0 and I don't have this panic, it seems that only raid10 causes the panic. At this point I am stumped as to what I can do. I am feel this is more an issue with mdadm than dm-crypt but I figured it was worth getting others opinions. I appreciate any or all help, if I am missing any details let me know and I will provide them. 

Adam Boyhan 

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