On Thu, Jul 05, 2012 at 05:03:40PM -0400, .. ink .. wrote: > > I am using pclinuxos and "uname -a" gives: > > Linux mtz 3.2.18-pclos2.bfs #1 SMP PREEMPT Thu May 24 04:44:50 CEST > > 2012 i686 i686 i386 GNU/Linux > > > > Using this kernel version: > > > > i created a 2GB file using dd, then i opened a plain mapper on the > > file and then attempted to write 1GB of data through the mapper using > > dd and the system lock up. I tried it 3 times and it lock up 3 times. [...] > just to add to above with test results: > i created a 2GB file, then run the following commands to see where it > would lock up [...] > [root@mtz ink]# dd if=/dev/zero of=/dev/mapper/zzz bs=1024 count=110K > 115343360 bytes (115 MB) copied, 7.15232 s, 16.1 MB/s > [root@mtz ink]# dd if=/dev/zero of=/dev/mapper/zzz bs=1024 count=140K > 146800640 bytes (147 MB) copied, 4.80232 s, 30.6 MB/s > [root@mtz ink]# dd if=/dev/zero of=/dev/mapper/zzz bs=1024 count=200K > 209715200 bytes (210 MB) copied, 9.2493 s, 22.7 MB/s > [root@mtz ink]# dd if=/dev/zero of=/dev/mapper/zzz bs=1024 count=500K > 524288000 bytes (524 MB) copied, 36.333 s, 14.4 MB/s > [root@mtz ink]# dd if=/dev/zero of=/dev/mapper/zzz bs=1024 count=800K > 838860800 bytes (839 MB) copied, 205.896 s, 4.1 MB/s > > The last one locked the system couple of times but it managed to succeed. > > I then attempted to write 900MB to /dev/mapper/zzz and the system > locked up and had to hard power down two hours later.. Hi, just tried this with 3.3.8 (self-compiled from kernel.org) on top of debian Squeeze: R gatewagner:~/f/luks# dd if=/dev/zero of=/dev/mapper/e1 bs=1024 count=500K 524288000 bytes (524 MB) copied, 11.0068 s, 47.6 MB/s R gatewagner:~/f/luks# dd if=/dev/zero of=/dev/mapper/e1 bs=1024 count=800K 838860800 bytes (839 MB) copied, 18.7919 s, 44.6 MB/s R gatewagner:~/f/luks# dd if=/dev/zero of=/dev/mapper/e1 bs=1024 count=900K 943718400 bytes (944 MB) copied, 18.6192 s, 50.7 MB/s R gatewagner:~/f/luks# dd if=/dev/zero of=/dev/mapper/e1 bs=1024 count=2000K 2097152000 bytes (2.1 GB) copied, 44.9154 s, 46.7 MB/s What I notice is that your transfer speeds are awfully low compared to mine. And my set-up is slow with a 3-way RAID 1 on 5400rpm 2.5" disks. Your speed seems to be dropping with larger transfers, something which it should not do (unless you write enough to change disk zones) and which I do not see in my system. I suspect this is a different problem, e.g. a dying and/or overheating controller. It may also be a RAM problem that only hits on large enough transfers. See cryptsetup FAQ on how to test RAM. > first time experience like the one reported here in the second > paragraph: http://www.pclinuxos.com/forum/index.php/topic,106847.msg912803.html#msg912803 That looks like a ZuluCrypt artefact to me, not something you would see with cryptsetup. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision. -- Bertrand Russell _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
