openstack/openstack-manuals
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small changes to module003-ch007-swift-cluster-architecture

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added that - more capacity in the access layer that will
added “a” between words
changed to Object Storage
10-gigabit network hyphen added

Change-Id: Ie3ed5c5746c2cffe9a85a8f00ab0f82728a98e9e
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shillasaebi 2014-03-26 00:57:36 -04:00
parent eaee19793c
commit a6f40ff165
1 changed files with 16 additions and 16 deletions
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doc/training-guides/module003-ch007-swift-cluster-architecture.xml
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@ -8,10 +8,10 @@
xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xlink="http://www.w3.org/1999/xlink"
version="5.0" version="5.0"
xml:id="module003-ch007-cluster-architecture"> xml:id="module003-ch007-cluster-architecture">
<title>Cluster Arch</title> <title>Cluster architecture</title>
<para><guilabel>Access Tier</guilabel></para> <para><guilabel>Access Tier</guilabel></para>
<figure> <figure>
<title>Swift Cluster Architecture</title> <title>Object Storage cluster architecture</title>
<mediaobject> <mediaobject>
<imageobject> <imageobject>
<imagedata fileref="figures/image47.png"/> <imagedata fileref="figures/image47.png"/>
@ -24,33 +24,33 @@
moves data in and out of the system. This tier is composed moves data in and out of the system. This tier is composed
of front-end load balancers, ssl- terminators, of front-end load balancers, ssl- terminators,
authentication services, and it runs the (distributed) authentication services, and it runs the (distributed)
brain of the object storage system — the proxy server brain of the Object Storage system — the proxy server
processes.</para> processes.</para>
<para>Having the access servers in their own tier enables <para>Having the access servers in their own tier enables
read/write access to be scaled out independently of read/write access to be scaled out independently of
storage capacity. For example, if the cluster is on the storage capacity. For example, if the cluster is on the
public Internet and requires ssl-termination and has high public Internet and requires SSL-termination and has high
demand for data access, many access servers can be demand for data access, many access servers can be
provisioned. However, if the cluster is on a private provisioned. However, if the cluster is on a private
network and it is being used primarily for archival network and it is being used primarily for archival
purposes, fewer access servers are needed.</para> purposes, fewer access servers are needed.</para>
<para>As this is an HTTP addressable storage service, a load <para>A load balancer can be incorporated into the access tier,
balancer can be incorporated into the access tier.</para> because this is an HTTP addressable storage service.</para>
<para>Typically, this tier comprises a collection of 1U <para>Typically, this tier comprises a collection of 1U
servers. These machines use a moderate amount of RAM and servers. These machines use a moderate amount of RAM and
are network I/O intensive. As these systems field each are network I/O intensive. It is wise to provision them with
incoming API request, it is wise to provision them with two high-throughput (10GbE) interfaces, because these systems
two high-throughput (10GbE) interfaces. One interface is field each incoming API request. One interface is
used for 'front-end' incoming requests and the other for used for 'front-end' incoming requests and the other for
'back-end' access to the object storage nodes to put and 'back-end' access to the Object Storage nodes to put and
fetch data.</para> fetch data.</para>
<para><guilabel>Factors to Consider</guilabel></para> <para><guilabel>Factors to consider</guilabel></para>
<para>For most publicly facing deployments as well as <para>For most publicly facing deployments as well as
private deployments available across a wide-reaching private deployments available across a wide-reaching
corporate network, SSL will be used to encrypt traffic corporate network, SSL is used to encrypt traffic
to the client. SSL adds significant processing load to to the client. SSL adds significant processing load to
establish sessions between clients; more capacity in establish sessions between clients; it adds more capacity to
the access layer will need to be provisioned. SSL may the access layer that will need to be provisioned. SSL may
not be required for private deployments on trusted not be required for private deployments on trusted
networks.</para> networks.</para>
<para><guilabel>Storage Nodes</guilabel></para> <para><guilabel>Storage Nodes</guilabel></para>
@ -63,14 +63,14 @@
</mediaobject> </mediaobject>
</figure> </figure>
<para>The next component is the storage servers themselves. <para>The next component is the storage servers themselves.
Generally, most configurations should have each of the Generally, most configurations should provide each of the
five Zones with an equal amount of storage capacity. five Zones with an equal amount of storage capacity.
Storage nodes use a reasonable amount of memory and CPU. Storage nodes use a reasonable amount of memory and CPU.
Metadata needs to be readily available to quickly return Metadata needs to be readily available to quickly return
objects. The object stores run services not only to field objects. The object stores run services not only to field
incoming requests from the Access Tier, but to also run incoming requests from the Access Tier, but to also run
replicators, auditors, and reapers. Object stores can be replicators, auditors, and reapers. Object stores can be
provisioned with single gigabit or 10 gigabit network provisioned with a single gigabit or a 10-gigabit network
interface depending on expected workload and desired interface depending on expected workload and desired
performance.</para> performance.</para>
<para>Currently, a 2&nbsp;TB or 3&nbsp;TB SATA disk delivers <para>Currently, a 2&nbsp;TB or 3&nbsp;TB SATA disk delivers