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Bug 1281651, added sizing guidelines for etcd service nodes #3448

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10 changes: 8 additions & 2 deletions install_config/install/prerequisites.adoc
Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ ifdef::openshift-enterprise[]
* Base OS: RHEL 7.3 or later with "Minimal" installation option, or RHEL Atomic
Host 7.3.2 or later. RHEL 7.2 is also supported using Docker 1.12 and its dependencies.
endif::[]
* NetworkManager 1.0 or later
* NetworkManager 1.0 or later.
* 1 vCPU.
* Minimum 8 GB RAM.
* Minimum 15 GB hard disk space for the file system containing *_/var/_*.
Expand All @@ -79,7 +79,13 @@ back end; see xref:configuring-docker-storage[Configuring Docker Storage]
below.

|External etcd Nodes
|Minimum 20 GB hard disk space for etcd data.
a|* Minimum 20 GB hard disk space for etcd data.
* Consult
link:https://github.com/coreos/etcd/blob/master/Documentation/op-guide/hardware.md#hardware-recommendations[Hardware
Recommendations] to properly size your etcd nodes.
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The information in this link is great, however I don't think it looks good for us to point customers at github wiki page to define such an important concept.

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@timothysc thoughts?

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@timothysc Please see this comment from @sferich888 . How should we move forward? Thanks!

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I don't thinks it's a concern at this time. My 0th concern is getting the information in the hands of those who need it, and it staying current, and this is the easiest way to do that.

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I'm going to merge what we have. We can continue to iterate on this as it evolves.

* Currently, {product-title} stores image metadata in etcd. You must periodically
prune old images. If you are planning to leverage a large number of images,
place etcd on machines with large amounts of memory and fast SSD drives.
|===

[IMPORTANT]
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