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LUKS/ dm-crypt/ ext4 appears to be single threaded


Thread moved from debian-user.

Please comment.



I have a 1.5 TB SATA hard drive I use for back-up's.  It has a single
large partition encrypted with LUKS/ dm-crypt and formatted with ext4.
I've noticed what appears to be single-threaded behavior when one
process is performing a long-lived write to the disk (notably 'ssh
user@host tar ... > backupfile.tar.gz') and another process attempts to
access the disk (either read or write). This is tolerable for a back-up application, but would not be acceptable for multi-user, multi-process, and/or multi-threaded applications (file server, terminal server, web server, etc.).

Is this a fundamental limitation of LUKS, dm-crypt, and/or ext4, or
something I've configured/ misconfigured?

If a fundamental limitation, is there something I can substitute to
eliminate the problem?

Some manufacturers make hard drives with built-in encryption. Are these supported by Debian, Linux, or BSD?


Any other comments or suggestions?



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