On Wed, Oct 07, 2009 at 11:07:42AM +0200, Hermann Lauer wrote: > On Wed, Oct 07, 2009 at 12:03:01AM +0200, Wouter Verhelst wrote: > > > with the raid1 setup below if the nbd-server stops nbd-client dies too, > > > the /dev/nbd0 device > > > disappears > > > > What do you mean by 'the device disappears'? The device node will not go > > away; do you just mean to say that the connection is lost? > > Sorry, I mean disappearing from /proc/partitions.
Okay. > > What happens if you wait "timeout" seconds and try to read from the > > device manually (e.g., by doing "dd if=/dev/nbd0 of=/dev/zero count=1")? > > The nbd-client dies, and the partition is no longer in /proc/partitions. > > # dd if=/dev/nbd0 of=/dev/zero count=1 > 0+0 records in > 0+0 records out > 0 bytes (0 B) copied, 3.9789e-05 s, 0.0 kB/s > > dd on a never used /dev/nbd* device reports the same. Hm. Looks like the kernel no longer produces an error when trying to read from a not-connected NBD device. Not immediately sure what's going on here; will have to do some debugging. I'll let you know when I know more. -- The biometric identification system at the gates of the CIA headquarters works because there's a guard with a large gun making sure no one is trying to fool the system. http://www.schneier.com/blog/archives/2009/01/biometrics.html -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
