This document discusses using the flashcache block cache with DRBD for high availability and performance. It provides an example of setting up a clustered flashcache configuration using DRBD for replication and outlines some limitations including using out-of-tree kernel code, packaging challenges, and the need for an OCF resource agent. Additional information and ways to provide feedback on the talk are provided at the end.

1. Storage Replication
in High-Performance
High-Availability Environments
Florian Haas
hastexo

2. flashcache
A general-purpose write-back block
cache for Linux

3. "Facebook" and the Facebook logo are registered trademarks of Facebook, Inc.

5. +

6. dm
+

7. App
DRBD
dm dm
+ +
"DRBD" and the DRBD logo are registered trademarks of LINBIT Information Technologies GmbH.

8. App
dm
DRBD DRBD
+

9. So, how does this help us?

10. https://github.com/fghaas/
flashcache/tree/ocf-ra

11. primitive p_drbd
ocf:linbit:drbd
params drbd_resource="flashcache"
op monitor role="Master" interval="10"
op monitor role="Slave" interval="20"
clone cl_drbd p_drbd
meta notify=true
primitive p_flashcache_drbd
ocf:flashcache:flashcache
params name="fcdrbd"
device="/dev/drbd0"
cache_device="/dev/drbd1"
primitive p_fs_flashcache
ocf:heartbeat:filesystem
params device="/dev/mapper/fcdrbd"
directory="/srv/whatever"
fstype="xfs"

12. So, everything is wonderful?
Well, not quite.

13. Out-of-tree kernel code

14. Flashcache packaging

15. OCF resource agent

17. Further Information
http://www.hastexo.com
http://twitter.com/hastexo

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