[dm-crypt] md + dm-crypt + lvm2: I/O slows down system, I/O schedule ineffective

Alasdair G Kergon agk at redhat.com
Thu Feb 23 12:54:36 CET 2012


Check everything is aligned properly.

Maybe test this dm-crypt performance proposal too:
  http://people.redhat.com/mpatocka/patches/kernel/dm-crypt-paralelizace/current/series.html

The last couple of patches in particular are 'unexpected'.

Also experiment with the queue depth of the devices:
  nr_requests (/sys/block/<dev>/queue) is often far too small by default.

Alasdair


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