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Brian Behlendorf
9dcb971983
There have been reports of ZFS deadlocking due to what appears to be a lost IO. This patch addes some debugging to determine the exact state of the IO which neither 1) completed, 2) failed, or 3) timed out after zio_delay_max (30) seconds. This information will be logged using the ZFS FMA infrastructure as a 'delay' event and posted to the internal zevent log. By default the last 64 events will be kept in the log but the limit is configurable via the zfs_zevent_len_max module option. To dump the contents of the log use the 'zpool events -v' command and look for the resource.fs.zfs.delay event. It will include various information about the pool, vdev, and zio which may shed some light on the issue. In the context of this change the 120 second kernel blocked thread watchdog has been disabled for synchronous IOs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #930
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
To copy the kernel code inside your kernel source tree for builtin compilation:
$ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
$ ./copy-builtin /usr/src/linux-...
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org