[Bug 288226] Re: DRBD 8.0.11 is unusably slow

[Florian Hackenberger]

Chuck: 8.0.13 is a bugfix release, please see the following changelog.
Furthermore, please consider that DRBD is completely useless in a
production environment as of version 8.0.11. Every recent server has a
battery backed write cache for it's disks and I don't see the point of
forcing LTS users to take a slowdown of an order of magnitude (~3KB/s vs
~3MB/s) for applications writing in tiny increments (think INSERT
statements of a database).

From: http://git.drbd.org/?p=drbd-8.0.git;a=blob_plain;f=ChangeLog;hb=HEAD
8.0.13 (api:86/proto:86)
--------
 * Fixed online resizing if there is application IO on the fly when the
   resize is triggered.
 * Fixed online resizing if it is triggered from the secondary node.
 * Fixed a possible deadlock in case "become-primary-on-both" is used, and
   a resync starts
 * Fixed the invocation of the pri-on-incon-degr handler
 * Fixed the exit codes of drbdsetup
 * sock_create_lite() to avoid a socket->sk leak
 * Auto-tune socket buffers if sndbuf-size is set to zero
 * Made it to compile on Linux-2.6.26

8.0.12 (api:86/proto:86)
--------
 * Corrected lock-out of application IO during bitmap IO.
   (Only triggered issues with multi-terrabyte volumes)
 * If an attach would causes a split-brain,
   abort the attach, do not drop the connection
 * A node without data (no disk, no connection) only accepts data
   (attach or connect) if that data matches the last-known data
 * Fixed various race conditions between state transitions
 * Various bugfixes to issues found by using the sparse tool
 * Corrected the exit codes of drbdsetup/drbdadm to match
   the expectations of dopd (drbd-outdate-peer-daemon)
 * Corrected the online changing of the number of AL extents while
   application IO is in flight.
 * Two new config options no-disk-flushes and no-md-flushes to disable
   the use of io subsystem flushes and barrier BIOs.
 * Make it compile on Linux-2.6.25
 * Support for standard disk stats
 * Work on stalling issues of the resync process
 * drbdsetup /dev/drbdX down no longer fails for non-existing minors
 * Added wipe-md to drbdadm

-- 
DRBD 8.0.11 is unusably slow
https://bugs.launchpad.net/bugs/288226
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