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authorAlexander Motin <mav@FreeBSD.org>2015-09-10 12:40:31 +0000
committerAlexander Motin <mav@FreeBSD.org>2015-09-10 12:40:31 +0000
commit7ac58230ea37d1b0a2095ff19bea8e928fd79bfc (patch)
tree21fdd7752fb9d89cacedc1ad0f81075a34353a18 /sys/cam/ctl/ctl_backend.h
parentfb606ebabc5ead6411f33056f830fa3c9131a83c (diff)
downloadsrc-7ac58230ea37d1b0a2095ff19bea8e928fd79bfc.tar.gz
src-7ac58230ea37d1b0a2095ff19bea8e928fd79bfc.zip
Reimplement CTL High Availability.
CTL HA functionality was originally implemented by Copan many years ago, but large part of the sources was never published. This change includes clean room implementation of the missing code and fixes for many bugs. This code supports dual-node HA with ALUA in four modes: - Active/Unavailable without interlink between nodes; - Active/Standby with second node handling only basic LUN discovery and reservation, synchronizing with the first node through the interlink; - Active/Active with both nodes processing commands and accessing the backing storage, synchronizing with the first node through the interlink; - Active/Active with second node working as proxy, transfering all commands to the first node for execution through the interlink. Unlike original Copan's implementation, depending on specific hardware, this code uses simple custom TCP-based protocol for interlink. It has no authentication, so it should never be enabled on public interfaces. The code may still need some polishing, but generally it is functional. Relnotes: yes Sponsored by: iXsystems, Inc.
Notes
Notes: svn path=/head/; revision=287621
Diffstat (limited to 'sys/cam/ctl/ctl_backend.h')
-rw-r--r--sys/cam/ctl/ctl_backend.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/cam/ctl/ctl_backend.h b/sys/cam/ctl/ctl_backend.h
index e7d544a9fc5c..f5bfd83666c2 100644
--- a/sys/cam/ctl/ctl_backend.h
+++ b/sys/cam/ctl/ctl_backend.h
@@ -308,6 +308,12 @@ int ctl_lun_offline(struct ctl_be_lun *be_lun);
int ctl_lun_online(struct ctl_be_lun *be_lun);
/*
+ * Called on LUN HA role change.
+ */
+int ctl_lun_primary(struct ctl_be_lun *be_lun);
+int ctl_lun_secondary(struct ctl_be_lun *be_lun);
+
+/*
* Let the backend notify the initiator about changed capacity.
*/
void ctl_lun_capacity_changed(struct ctl_be_lun *be_lun);