openstack
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sahara
Code Issues Proposed changes

Updated volumes section in docs 

Improved description for cinder volumes usage mechanism.
Described the volumes backed by distributed storage case.

Change-Id: Ie5a436daaca9e5ed009aa131cf6487be3057182a
Closes-bug: #1371360
This commit is contained in:
Nikita Konovalov 2016-03-15 15:30:48 +03:00
parent e6ff7d17ea
commit 1af4701b85
1 changed files with 12 additions and 0 deletions
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doc/source/userdoc/features.rst
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@ -42,6 +42,18 @@ A user can set how many volumes will be attached to each instance in a
node group and the size of each volume. All volumes are attached during
cluster creation and scaling operations.
If volumes are used for the HDFS storage it's important to make sure that
the linear read-write operations as well as IOpS level are high enough to
handle the workload. Volumes placed on the same compute host provide a higher
level of performance.
In some cases cinder volumes can be backed by a distributed storage like Ceph.
In this type of installation it's important to make sure that the network
latency and speed do not become a blocker for HDFS. Distributed storage
solutions usually provide their own replication mechanism. HDFS replication
should be disabled so that it does not generate redundant traffic across the
cloud.
Cluster scaling
---------------