OpenStack + Rados Block Device(RBD)
OpenStack 連携
☆ OpenStack + Ceph 連携 - ジェダイさんのブログ
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☆ Welcome to Ceph — Ceph Documentation
MAASとJujuでつくるOpenStack環境構築入門 IceHouse対応版 - OpenStack最新情報セミナー 2014年10月
不具合
On Horizon UI in Admin/Hypervisors, Disk Usage shows incorrect value.
Bug #1359989 “Hypervisor summary shows incorrect total storage” : Bugs : Mirantis OpenStack
まだ修正されてない
live migration failed due to no shared storage when using rbd imagebackend
→ Junoで修正
librbd Cache チューニング
Note: Kernel modules can use Linux page caching. For librbd-based applications, Ceph supports RBD Caching.
http://ceph.com/docs/v0.80.5/rbd/rbd-config-ref/
v0.80.5 は rbd cache は Default: false
[client] rbd cache = trueで有効になる。
v0.80.9 は Default: true
[client] rbd cache = true rbd cache size = 536870912☆ Optimize Ceph cluster (kernel, osd, rbd) — CEPH Filesystem Users
Default: 32 MiB → 536870912 (512 MiB)
The cache is in memory on the client, and each RBD image has its own.
Welcome to Ceph — Ceph Documentation
RBD image ごと
total amount of ram = (number of virtual disks) X (rbd cache size)
