On Wed, Oct 27, 2010 at 10:10 AM, Arno Wagner <arno@xxxxxxxxxxx> wrote: > Currently there are kernel issues with write synchronisation. > These may affect a combination of any filesystem with LUKS/dm-crypt > more strongly than the filesystem alone. Fortunately (after a very > long time ignoring it) the kernel developpers have started to do > something about this issue. It is basically the same thing you get > when writing a very large file to disk and everything starts to > crawl. Or a smaller file to a slow device and dm-crypted/LUKSed > devices are slower. > > 2.6.36 is already a lot more responsive under these circumstances, > at least for the large file situation. > 2.6.37 is expected to improve the situation further. Where can I learn more about the specifics and implications of these issues? I posted a few weeks ago about some performance issues that sound a lot like the symptoms you describe. I've got an LUKS device on a 2TB Ethernet SAN drive (ATA over Ethernet) that is painfully slow when initializing and mkfs'ing; last try took 4+ days after a couple crashes due to what appear to be an out-of-memory condition in the kernel somewhere. Once it finished, I tried copying a 1TB file to it and that too ran for days before it mysteriously stalled after about 300GB. Paul -- Paul Dugas â Dugas Enterprises, LLC â Computer Engineer Paul@xxxxxxxxxxxxxxxxxxxx â +1.404.932.1355 _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
