Thanks for the fast reply. Am 26.02.2012 14:37, schrieb Alasdair G Kergon: > As we've mentioned to others, try increasing > /sys/block/<devices>/queue/nr_requests > significantly (e.g. see if 50,000 has any impact). > > Or experiment with these patches: > http://people.redhat.com/mpatocka/patches/kernel/dm-crypt-paralelizace/current/ > (at your own risk, of course). As I mentioned before, I chose a smaller chunk size for my RAID to solve this problem. As I am not interested in rebuilding a 6TB RAID again, I cannot verify if your suggestions increase write throughput with greater chunk size. I would suggest that the device mapper should set default values that give maximum performance for the default values other kernel subsystems use. As the RAID subsystem seems to use 512k chunks by default, the device mapper should use settings by default that allow maximum performance for this chunk size. Greets, Dennis _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
