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Brian Behlendorf 2959d94a0a Add FAILFAST support 
ZFS works best when it is notified as soon as possible when a device
failure occurs.  This allows it to immediately start any recovery
actions which may be needed.  In theory Linux supports a flag which
can be set on bio's called FAILFAST which provides this quick
notification by disabling the retry logic in the lower scsi layers.

That's the theory at least.  In practice is turns out that while the
flag exists you oddly have to set it with the BIO_RW_AHEAD flag.
And even when it's set it you may get retries in the low level
drivers decides that's the right behavior, or if you don't get the
right error codes reported to the scsi midlayer.

Unfortunately, without additional kernels patchs there's not much
which can be done to improve this.  Basically, this just means that
it may take 2-3 minutes before a ZFS is notified properly that a
device has failed.  This can be improved and I suspect I'll be
submitting patches upstream to handle this.
2010-10-12 14:55:02 -07:00
cmd Add FAILFAST support 2010-10-12 14:55:02 -07:00
config Add FAILFAST support 2010-10-12 14:55:02 -07:00
etc Add FAILFAST support 2010-10-12 14:55:02 -07:00
include Add FAILFAST support 2010-10-12 14:55:02 -07:00
lib Add FAILFAST support 2010-10-12 14:55:02 -07:00
man Add FAILFAST support 2010-10-12 14:55:02 -07:00
module Add FAILFAST support 2010-10-12 14:55:02 -07:00
patches Add build system 2010-08-31 13:41:27 -07:00
scripts Add FAILFAST support 2010-10-12 14:55:02 -07:00
.gitignore Ignore unsigned module build products 2010-03-09 14:14:09 -08:00
AUTHORS Add AUTHORS to master branch 2010-05-18 14:55:01 -07:00
autogen.sh Minor packaging fixes 2010-09-01 15:42:32 -07:00
ChangeLog Add build system 2010-08-31 13:41:27 -07:00
configure Add FAILFAST support 2010-10-12 14:55:02 -07:00
configure.ac Add [-m map] option to zpool_layout 2010-09-17 11:02:19 -07:00
COPYING Relocate COPYING+COPYRIGHT, remove README cruft 2008-12-01 15:34:53 -08:00
COPYRIGHT Update COPYRIGHT to reference zpios CDDL exceptions. 2010-05-18 14:25:28 -07:00
DISCLAIMER Update COPYRIGHT and DISCLAIMER. 2010-05-18 10:32:23 -07:00
Makefile.am Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
Makefile.in Add FAILFAST support 2010-10-12 14:55:02 -07:00
META Prep for zfs-0.5.1 tag 2010-09-01 16:00:15 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix markdown rendering 2010-09-15 09:09:37 -07:00
zfs_config.h.in Add FAILFAST support 2010-10-12 14:55:02 -07:00
zfs-modules.spec.in Use top level object directory in zfs-module.spec 2010-09-10 12:33:31 -07:00
zfs-script-config.sh.in Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
ZFS.RELEASE Update to onnv_147 2010-08-26 14:24:34 -07:00
zfs.spec.in Support custom build directories and move includes 2010-09-08 12:38:56 -07:00

README.markdown

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

Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org