philipp.reisner at linbit.com
Tue Mar 14 11:53:51 CET 2006
Finally the time has come to bring the DRBDv8 development code to
a broader audience. Here is the ChangeLog that outlines most improvements:
* Removed support for Linux-2.4.x
* Cleanup of the wire protocol.
* Added optional peer authentication with a shared secret.
* Consolidated state changes into a central function.
* Improved, tunable after-split-brain recovery strategies.
* Always verify all IDs used in the protocol that are used as pointers.
* Introduced the "outdate" disk state, and commands for managing it.
* Introduced the "drbdmeta" command, and require the user to create
* Support for primary/primary (for OCFS2, GFS...)
* Replaced the sync-groups with the sync-after mechanism.
* The "common" section in the configuration file.
* Replaced the generation counters (GCs) with data-generation-UUIDs
* Improved performance by using Linux-2.6's BIOs with up to 32k per
IO request. Before we transferred only up to 4k per IO request.
* A Warning if the disk sizes are more than 10% different.
* A connection teardown packet to differentiate between a crash
of the peer and a peer that is shut down gracefully.
* External imposable SyncPause states, to serialize DRBD's resynchronisation
with the resynchronisation of backing storage's RAID configurations.
* Backing storage can be hot added to disk less nodes.
* Prepared for advanced integration to Heartbeat-2.0
* Changed internal APIs so that missed writes of the meta-data super
block are reported as they happen.
* The http://usage.drbd.org sub project.
* Rewrote the scanner/parser of drbd.conf. 10 times smaller/faster and
easier to maintain.
* Asynchronous meta-data IO [ Code drop from the DRBD+ branch ]
Of course there is no documentation for DRBDv8 yet, nor it is feature
complete. But the still outstanding features are only minor changes.
So it is time for you to start testing this code on your testing
and staging clusters.
* stress tests
IO pressure, memory pressure etc...
* coverage tests
Try to test all possible failure and recovery scenarios.
* Performance comparison tests between drbd-0.7.x and drbd-8.0.x
* Put OCFS2 / GFS on top of it (still untested from my side)
Please send _usefull_ reports to drbd-dev at lists.linbit.com . Please note
that that list is moderated, and we try to keep the traffic there
Send random observations regarding DRBD-8 to drbd-user at lists.linbit.com
: Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH Fax +43-1-8178292-82 :
: Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :
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