Dear DRBD-users,
This is release candidate one of drbd-9.1.13 and drbd-9.2.2. In the
number of changed lines, the work on improving quorum is the most
significant change in this upcoming release. Here is a minor example
that highlights the improvement.
Consider nodes A, B, and C with ascending node IDs.
C | C is diskless
/ \ | A is Secondary and has a backing disk
A---B | B is Secondary, having a backing disk
Step 1: A does a graceful disconnect from B
C | C is diskless and has quorum
/ \ | A is Secondary with disk and has quorum
A B | B is Secondary with disk and has quorum
Step 2: A disconnects unexpectedly from C (with --force or crash)
C | C is with quorum since it is part of 2 out of 3
\ | A is **without** quorum
A B | B is with quorum since it is part of 2 out of 3
Step 3: C disconnects unexpectedly from B (with --force or crash)
C | C is without quorum
| A is without quorum
A B | B is ...
With earlier versions of DRBD B had lost quorum as well. Starting
with drbd-9.1.13 (drbd drbd-9.2.2) DRBD keeps quorum in this situation.
It can do that because it knows that A can not have quorum.
**Important news regarding drbd-9.2:**
We fixed all known regressions of drbd-9.2.0. drbd-9.2 has heavily
improved resync behavior when coordinating between application I/O and
resync I/O, and handling resyncs of thinly provisioned backing
storage. It has improved latency for all write requests.
Please help test the release candidates.
9.1.13-rc.1 (api:genl2/proto:110-121/transport:17)
--------
* when calculating if a partition has quorum, take into account if
the missing nodes might have a quorum
* fix forget-peer for diskless peers
* clear the resync_again counter upon disconnect
* also call the unfence handler when no resync happens
* do not set bitmap bits when attaching to an up-to-date disk (late)
* work on bringing the out-of-tree DRBD9 closer to DRBD in the upstream
kernel; Use lru_cahche.ko from the installed kernel whenever possible
9.2.2-rc.1 (api:genl2/proto:110-121/transport:18)
--------
* fix spurious PingAck timeout a second time; we need to use a drbd
owned workqueue to guarantee the required low-latency replies
* Fix connection abort during resync with log message
"Unexpected resync write ack at ..." a regression of drbd-9.2
* merged changes from drbd-9.1.13
- when calculating if a partition has quorum, take into account if
the missing nodes might have a quorum
- fix forget-peer for diskless peers
- clear the resync_again counter upon disconnect
- also call the unfence handler when no resync happens
- do not set bitmap bits when attaching to an up-to-date disk (late)
- work on bringing the out-of-tree DRBD9 closer to DRBD in the upstream
kernel; Use lru_cahche.ko from the installed kernel whenever possible
https://pkg.linbit.com//downloads/drbd/9/drbd-9.1.13-rc.1.tar.gz
https://pkg.linbit.com//downloads/drbd/9/drbd-9.2.2-rc.1.tar.gz
https://github.com/LINBIT/drbd/commit/4b882c56cfe8095bff585605c227356562ef8e44
https://github.com/LINBIT/drbd/commit/66e12539362b98d7d0b7bfb9f3b36af846457363
-Phil
_______________________________________________
drbd-announce mailing list
drbd-announce@lists.linbit.com
https://lists.linbit.com/mailman/listinfo/drbd-announce
This is release candidate one of drbd-9.1.13 and drbd-9.2.2. In the
number of changed lines, the work on improving quorum is the most
significant change in this upcoming release. Here is a minor example
that highlights the improvement.
Consider nodes A, B, and C with ascending node IDs.
C | C is diskless
/ \ | A is Secondary and has a backing disk
A---B | B is Secondary, having a backing disk
Step 1: A does a graceful disconnect from B
C | C is diskless and has quorum
/ \ | A is Secondary with disk and has quorum
A B | B is Secondary with disk and has quorum
Step 2: A disconnects unexpectedly from C (with --force or crash)
C | C is with quorum since it is part of 2 out of 3
\ | A is **without** quorum
A B | B is with quorum since it is part of 2 out of 3
Step 3: C disconnects unexpectedly from B (with --force or crash)
C | C is without quorum
| A is without quorum
A B | B is ...
With earlier versions of DRBD B had lost quorum as well. Starting
with drbd-9.1.13 (drbd drbd-9.2.2) DRBD keeps quorum in this situation.
It can do that because it knows that A can not have quorum.
**Important news regarding drbd-9.2:**
We fixed all known regressions of drbd-9.2.0. drbd-9.2 has heavily
improved resync behavior when coordinating between application I/O and
resync I/O, and handling resyncs of thinly provisioned backing
storage. It has improved latency for all write requests.
Please help test the release candidates.
9.1.13-rc.1 (api:genl2/proto:110-121/transport:17)
--------
* when calculating if a partition has quorum, take into account if
the missing nodes might have a quorum
* fix forget-peer for diskless peers
* clear the resync_again counter upon disconnect
* also call the unfence handler when no resync happens
* do not set bitmap bits when attaching to an up-to-date disk (late)
* work on bringing the out-of-tree DRBD9 closer to DRBD in the upstream
kernel; Use lru_cahche.ko from the installed kernel whenever possible
9.2.2-rc.1 (api:genl2/proto:110-121/transport:18)
--------
* fix spurious PingAck timeout a second time; we need to use a drbd
owned workqueue to guarantee the required low-latency replies
* Fix connection abort during resync with log message
"Unexpected resync write ack at ..." a regression of drbd-9.2
* merged changes from drbd-9.1.13
- when calculating if a partition has quorum, take into account if
the missing nodes might have a quorum
- fix forget-peer for diskless peers
- clear the resync_again counter upon disconnect
- also call the unfence handler when no resync happens
- do not set bitmap bits when attaching to an up-to-date disk (late)
- work on bringing the out-of-tree DRBD9 closer to DRBD in the upstream
kernel; Use lru_cahche.ko from the installed kernel whenever possible
https://pkg.linbit.com//downloads/drbd/9/drbd-9.1.13-rc.1.tar.gz
https://pkg.linbit.com//downloads/drbd/9/drbd-9.2.2-rc.1.tar.gz
https://github.com/LINBIT/drbd/commit/4b882c56cfe8095bff585605c227356562ef8e44
https://github.com/LINBIT/drbd/commit/66e12539362b98d7d0b7bfb9f3b36af846457363
-Phil
_______________________________________________
drbd-announce mailing list
drbd-announce@lists.linbit.com
https://lists.linbit.com/mailman/listinfo/drbd-announce