a45824ea32
Some information need to be added in order to provide a better explanation of the driver configuration. Change-Id: I18023a7e566afc4ee2afffb740b4bc1a82f713ed
632 lines
28 KiB
XML
632 lines
28 KiB
XML
<!DOCTYPE section [
|
|
<!ENTITY % openstack SYSTEM "../../../common/entities/openstack.ent">
|
|
%openstack;
|
|
]>
|
|
<section xml:id="hds-hnas-driver"
|
|
xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
|
|
<title>HDS HNAS iSCSI and NFS driver</title>
|
|
<?dbhtml stop-chunking?>
|
|
<para>This OpenStack Block Storage volume driver provides iSCSI and NFS
|
|
support for
|
|
<link xlink:href="http://www.hds.com/products/file-and-content/network-attached-storage/"
|
|
>Hitachi NAS Platform</link> Models 3080, 3090, 4040, 4060, 4080
|
|
and 4100.</para>
|
|
<section xml:id="hds-hnas-supported-operations">
|
|
<title>Supported operations</title>
|
|
<para>The NFS and iSCSI drivers support these operations:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>Create, delete, attach, and detach volumes.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Create, list, and delete volume snapshots.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Create a volume from a snapshot.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Copy an image to a volume.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Copy a volume to an image.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Clone a volume.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Extend a volume.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Get volume statistics.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
<section xml:id="hds-hnas-storage-reqs">
|
|
<title>HNAS storage requirements</title>
|
|
<para>
|
|
Before using iSCSI and NFS services, use the HNAS configuration and
|
|
management GUI (SMU) or SSC CLI to create storage pool(s), file system(s),
|
|
and assign an EVS. Make sure that the file system used is not
|
|
created as <literal>replication targets</literal>. Additionally:
|
|
</para>
|
|
<variablelist>
|
|
<varlistentry><term><emphasis>For NFS:</emphasis></term>
|
|
<listitem>
|
|
<para>
|
|
Create NFS exports, choose a path for them (it must
|
|
be different from "/") and set the <guilabel>Show
|
|
snapshots</guilabel> option to <literal>hide and disable
|
|
access</literal>.
|
|
</para>
|
|
<para>
|
|
Also, configure the option <literal>norootsquash
|
|
</literal> as <option>"* (rw, norootsquash)",</option> so
|
|
cinder services can change the permissions of its volumes.
|
|
</para>
|
|
<para>
|
|
In order to use the hardware accelerated features of
|
|
NFS HNAS, we recommend setting <literal>max-nfs-version
|
|
</literal> to 3.
|
|
Refer to HNAS command line reference to see how to
|
|
configure this option.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry><term><emphasis>For iSCSI:</emphasis></term>
|
|
<listitem>
|
|
<para>You need to set an iSCSI domain.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</section>
|
|
<section xml:id="hds-hnas-cinder-reqs">
|
|
<title>Block storage host requirements</title>
|
|
<variablelist>
|
|
<varlistentry><term>The HNAS driver is supported for Red Hat, SUSE Cloud
|
|
and Ubuntu Cloud. The following packages must be installed:</term>
|
|
<listitem>
|
|
<orderedlist>
|
|
<listitem>
|
|
<para><package>nfs-utils</package> for Red Hat</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para><package>nfs-client</package> for SUSE</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
<package>nfs-common</package>, <package>libc6-i386</package>
|
|
for Ubuntu (<package>libc6-i386</package> only required on
|
|
Ubuntu 12.04)
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If you are not using SSH, you need the HDS SSC package
|
|
(<package>hds-ssc-v1.0-1</package>) to
|
|
communicate with an HNAS array using the <command>SSC
|
|
</command> command. This utility package is available
|
|
in the RPM package distributed with the hardware
|
|
through physical media or it can be manually
|
|
copied from the SMU to the Block Storage host.
|
|
</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</section>
|
|
<section xml:id="hds-hnas-pkg-install">
|
|
<title>Package installation</title>
|
|
<procedure>
|
|
<para>If you are installing the driver from a RPM or DEB package,
|
|
follow the steps bellow:</para>
|
|
<step><para>Install SSC:</para>
|
|
<para>In Red Hat:</para>
|
|
<screen><prompt>#</prompt> <userinput>rpm -i hds-ssc-v1.0-1.rpm</userinput></screen>
|
|
<para>Or in SUSE:</para>
|
|
<screen><prompt>#</prompt> <userinput>zypper hds-ssc-v1.0-1.rpm</userinput></screen>
|
|
<para>Or in Ubuntu:</para>
|
|
<screen><prompt>#</prompt> <userinput>dpkg -i hds-ssc_1.0-1_all.deb</userinput></screen>
|
|
</step>
|
|
<step><para>Install the dependencies:</para>
|
|
<para>In Red Hat:</para>
|
|
<screen><prompt>#</prompt> <userinput>yum install nfs-utils nfs-utils-lib</userinput></screen>
|
|
<para>Or in Ubuntu:</para>
|
|
<screen><prompt>#</prompt> <userinput>apt-get install nfs-common</userinput></screen>
|
|
<para>Or in SUSE:</para>
|
|
<screen><prompt>#</prompt> <userinput>zypper install nfs-client</userinput></screen>
|
|
<para>If you are using Ubuntu 12.04, you also need to install
|
|
<package>libc6-i386</package></para>
|
|
<screen><prompt>#</prompt> <userinput>apt-get install libc6-i386</userinput></screen>
|
|
</step>
|
|
<step><para>Configure the driver as described in the "Driver
|
|
Configuration" section.</para></step>
|
|
<step><para>Restart all cinder services (volume, scheduler and
|
|
backup).</para></step>
|
|
</procedure>
|
|
</section>
|
|
<section xml:id="hds-hnas-drive-config">
|
|
<title>Driver configuration</title>
|
|
<para>The HDS driver supports the concept of differentiated
|
|
services (also referred as quality of service) by mapping
|
|
volume types to services provided through HNAS.</para>
|
|
<para>HNAS supports a variety of storage options and file
|
|
system capabilities, which are selected through the definition
|
|
of volume types and the use of multiple back ends. The driver
|
|
maps up to four volume types into separated exports or file
|
|
systems, and can support any number if using multiple back
|
|
ends.</para>
|
|
<para>The configuration for the driver is read from an
|
|
XML-formatted file (one per back end), which you need to create
|
|
and set its path in the <filename>cinder.conf</filename> configuration
|
|
file. Below are the configuration needed in
|
|
the <filename>cinder.conf</filename> configuration file
|
|
<footnote xml:id="hds-hnas-no-fixed-location-1">
|
|
<para>The configuration file location may differ.</para>
|
|
</footnote>:
|
|
</para>
|
|
<programlisting language="ini">[DEFAULT]
|
|
enabled_backends = hnas_iscsi1, hnas_nfs1</programlisting>
|
|
<para>For HNAS iSCSI driver create this section:</para>
|
|
<programlisting language="ini">[hnas_iscsi1]
|
|
volume_driver = cinder.volume.drivers.hds.iscsi.HDSISCSIDriver
|
|
hds_hnas_iscsi_config_file = <replaceable>/path/to/config/hnas_config_file.xml</replaceable>
|
|
volume_backend_name = <replaceable>HNAS-ISCSI</replaceable></programlisting>
|
|
<para>For HNAS NFS driver create this section:</para>
|
|
<programlisting language="ini">[hnas_nfs1]
|
|
volume_driver = cinder.volume.drivers.hds.nfs.HDSNFSDriver
|
|
hds_hnas_nfs_config_file = <replaceable>/path/to/config/hnas_config_file.xml</replaceable>
|
|
volume_backend_name = <replaceable>HNAS-NFS</replaceable></programlisting>
|
|
<para>The XML file has the following format:
|
|
</para>
|
|
<programlisting language="xml"><?xml version = "1.0" encoding = "UTF-8" ?>
|
|
<config>
|
|
<mgmt_ip0>172.24.44.15</mgmt_ip0>
|
|
<hnas_cmd>ssc</hnas_cmd>
|
|
<chap_enabled>False</chap_enabled>
|
|
<ssh_enabled>False</ssh_enabled>
|
|
<cluster_admin_ip0>10.1.1.1</cluster_admin_ip0>
|
|
<username>supervisor</username>
|
|
<password>supervisor</password>
|
|
<svc_0>
|
|
<volume_type>default</volume_type>
|
|
<iscsi_ip>172.24.44.20</iscsi_ip>
|
|
<hdp>fs01-husvm</hdp>
|
|
</svc_0>
|
|
<svc_1>
|
|
<volume_type>platinun</volume_type>
|
|
<iscsi_ip>172.24.44.20</iscsi_ip>
|
|
<hdp>fs01-platinun</hdp>
|
|
</svc_1>
|
|
</config></programlisting>
|
|
</section>
|
|
<section xml:id="hds-hnas-xml-config-options">
|
|
<title>HNAS volume driver XML configuration options</title>
|
|
<para>An OpenStack Block Storage node using HNAS drivers can have up to
|
|
four services. Each service is defined by a <literal>svc_n
|
|
</literal> tag (<literal>svc_0</literal>, <literal>svc_1</literal>,
|
|
<literal>svc_2</literal>, or <literal>svc_3</literal>
|
|
<footnote xml:id="hds-hnas-stats-all-hdp">
|
|
<para>There is no relative precedence or weight among these
|
|
four labels.</para>
|
|
</footnote>, for example). These are the configuration options
|
|
available for each service label:
|
|
</para>
|
|
<table rules="all">
|
|
<caption>Configuration options for service labels</caption>
|
|
<col width="25%"/>
|
|
<col width="10%"/>
|
|
<col width="15%"/>
|
|
<col width="50%"/>
|
|
<thead>
|
|
<tr>
|
|
<td>Option</td>
|
|
<td>Type</td>
|
|
<td>Default</td>
|
|
<td>Description</td>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>
|
|
<para><option>volume_type</option></para>
|
|
</td>
|
|
<td><para>Required</para></td>
|
|
<td><para><literal>default</literal></para></td>
|
|
<td>
|
|
<para>
|
|
When a <literal>create_volume</literal> call with
|
|
a certain volume type happens, the volume type will
|
|
try to be matched up with this tag. In each
|
|
configuration file you must define the <literal>
|
|
default</literal> volume type in the service
|
|
labels and, if no volume type is specified, the
|
|
<literal>default</literal> is used. Other labels
|
|
are case sensitive and should match exactly. If no
|
|
configured volume types match the incoming
|
|
requested type, an error occurs in the volume
|
|
creation.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para><option>iscsi_ip</option></para>
|
|
</td>
|
|
<td><para>Required only for iSCSI</para></td>
|
|
<td><para/></td>
|
|
<td>
|
|
<para>
|
|
An iSCSI IP address dedicated to the service.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para><option>hdp</option></para>
|
|
</td>
|
|
<td><para>Required</para></td>
|
|
<td><para/></td>
|
|
<td>
|
|
<para>
|
|
For iSCSI driver: virtual file system label
|
|
associated with the service.
|
|
</para>
|
|
<para>
|
|
For NFS driver: path to the volume
|
|
(<ip_address>:/<path>) associated with
|
|
the service.
|
|
</para>
|
|
<para>
|
|
Additionally, this entry must be added in the file
|
|
used to list available NFS shares. This file is
|
|
located, by default, in
|
|
<filename>/etc/cinder/nfs_shares</filename> or you
|
|
can specify the location in the
|
|
<literal>nfs_shares_config</literal> option in the
|
|
<filename>cinder.conf</filename> configuration file.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<para>
|
|
These are the configuration options available to the
|
|
<literal>config</literal> section of the XML config file:
|
|
</para>
|
|
<table rules="all">
|
|
<caption>Configuration options</caption>
|
|
<col width="25%"/>
|
|
<col width="10%"/>
|
|
<col width="15%"/>
|
|
<col width="50%"/>
|
|
<thead>
|
|
<tr>
|
|
<td>Option</td>
|
|
<td>Type</td>
|
|
<td>Default</td>
|
|
<td>Description</td>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><para><option>mgmt_ip0</option></para>
|
|
</td>
|
|
<td><para>Required</para></td>
|
|
<td><para/></td>
|
|
<td>
|
|
<para>
|
|
Management Port 0 IP address. Should be the IP
|
|
address of the "Admin" EVS.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><para><option>hnas_cmd</option></para>
|
|
</td>
|
|
<td><para>Optional</para></td>
|
|
<td><para>ssc</para></td>
|
|
<td>
|
|
<para>
|
|
Command to communicate to HNAS array.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><para><option>chap_enabled</option></para>
|
|
</td>
|
|
<td><para>Optional (iSCSI only)</para></td>
|
|
<td><para><literal>True</literal></para></td>
|
|
<td>
|
|
<para>
|
|
Boolean tag used to enable CHAP authentication
|
|
protocol.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><para><option>username</option></para>
|
|
</td>
|
|
<td><para>Required</para></td>
|
|
<td><para>supervisor</para></td>
|
|
<td>
|
|
<para>It's always required on HNAS.</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><para><option>password</option></para>
|
|
</td>
|
|
<td><para>Required</para></td>
|
|
<td><para>supervisor</para></td>
|
|
<td>
|
|
<para>Password is always required on HNAS.</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para>
|
|
<option>svc_0, svc_1, svc_2, svc_3</option>
|
|
</para>
|
|
</td>
|
|
<td>
|
|
<para>Optional</para>
|
|
</td>
|
|
<td>
|
|
<para>
|
|
(at least one label has to be defined)
|
|
</para>
|
|
</td>
|
|
<td>
|
|
<para>
|
|
Service labels: these four predefined
|
|
names help four different sets of
|
|
configuration options. Each can specify
|
|
HDP and a unique volume type.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para>
|
|
<option>cluster_admin_ip0</option>
|
|
</para>
|
|
</td>
|
|
<td>
|
|
<para>Optional if <option>ssh_enabled</option>
|
|
is <literal>True</literal></para>
|
|
</td>
|
|
<td>
|
|
</td>
|
|
<td>
|
|
<para>
|
|
The address of HNAS cluster admin.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para>
|
|
<option>ssh_enabled</option>
|
|
</para>
|
|
</td>
|
|
<td>
|
|
<para>Optional</para>
|
|
</td>
|
|
<td>
|
|
<para><literal>False</literal></para>
|
|
</td>
|
|
<td>
|
|
<para>
|
|
Enables SSH authentication between Block Storage
|
|
host and the SMU.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<para>
|
|
<option>ssh_private_key</option>
|
|
</para>
|
|
</td>
|
|
<td>
|
|
<para>Required if <literal>ssh_enabled</literal> is
|
|
<literal>True</literal></para>
|
|
</td>
|
|
<td>
|
|
<para><literal>False</literal></para>
|
|
</td>
|
|
<td>
|
|
<para>
|
|
Path to the SSH private key used to authenticate
|
|
in HNAS SMU. The public key must be uploaded to
|
|
HNAS SMU using <literal>ssh-register-public-key
|
|
</literal> (this is an SSH subcommand). Note that
|
|
copying the public key HNAS using
|
|
<literal>ssh-copy-id</literal> doesn't work
|
|
properly as the SMU periodically wipe out those
|
|
keys.
|
|
</para>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</section>
|
|
<section xml:id="hds-hnas-service-labels">
|
|
<title>Service labels</title>
|
|
<para>
|
|
HNAS driver supports differentiated types of service using the service
|
|
labels. It is possible to create up to four types of them, as gold,
|
|
platinun, silver and ssd, for example.
|
|
</para>
|
|
<para>
|
|
After creating the services in the XML configuration file, you
|
|
must configure one <literal>volume_type</literal> per service.
|
|
Each <literal>volume_type</literal> must have the metadata <literal>
|
|
service_label</literal> with the same name configured in the
|
|
<literal><volume_type></literal> section of that
|
|
service. If this is not set, OpenStack Block Storage will
|
|
schedule the volume creation to the pool with largest available
|
|
free space or other criteria configured in volume filters.
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>cinder type-create 'default'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-key 'default' set service_label = 'default'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-create 'platinun-tier'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-key 'platinun' set service_label = 'platinun'</userinput></screen>
|
|
</section>
|
|
<section xml:id="hds-hnas-multibend-config">
|
|
<title>Multi-back-end configuration</title>
|
|
<para>
|
|
If you use multiple back ends and intend to enable the creation of
|
|
a volume in a specific back end, you must configure volume types to
|
|
set the <literal>volume_backend_name</literal> option to the
|
|
appropriate back end. Then, create <literal>volume_type</literal>
|
|
configurations with the same <literal>volume_backend_name
|
|
</literal>.
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>cinder type-create 'iscsi'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-key 'iscsi' set volume_backend_name = 'HNAS-ISCSI'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-create 'nfs'</userinput>
|
|
<prompt>$</prompt> <userinput>cinder type-key 'nfs' set volume_backend_name = 'HNAS-NFS'</userinput></screen>
|
|
<para>
|
|
You can deploy multiple OpenStack HNAS drivers instances that each
|
|
control a separate HNAS array. Each service (<literal>svc_0, svc_1,
|
|
svc_2, svc_3</literal>) on the instances need to have a volume_type
|
|
and service_label metadata associated with it. If no metadata is
|
|
associated with a pool, OpenStack Block Storage filtering algorithm
|
|
selects the pool with the largest available free space.
|
|
</para>
|
|
</section>
|
|
<section xml:id="hds-hnas-ssh-config">
|
|
<title>SSH configuration</title>
|
|
<para>
|
|
Instead of using <command>SSC</command> on the Block Storage host
|
|
and store its credential on the XML configuration file, HNAS driver
|
|
supports <command>SSH</command> authentication. To configure that:
|
|
</para>
|
|
<procedure>
|
|
<step>
|
|
<para>
|
|
If you don't have a pair of public keys already generated,
|
|
create it in the Block Storage host (leave the pass-phrase
|
|
empty):
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>mkdir -p <replaceable>/opt/hds/ssh</replaceable></userinput>
|
|
<prompt>$</prompt> <userinput>ssh-keygen -f <replaceable>/opt/hds/ssh/hnaskey</replaceable></userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Change the owner of the key to <literal>cinder</literal>
|
|
(or the user the volume service will be run):
|
|
</para>
|
|
<screen><prompt>#</prompt> <userinput>chown -R cinder.cinder <replaceable>/opt/hds/ssh</replaceable></userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Create the directory "ssh_keys" in the SMU server:
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>ssh [manager|supervisor]@<smu-ip> 'mkdir -p /var/opt/mercury-main/home/[manager|supervisor]/ssh_keys/'</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Copy the public key to the "ssh_keys" directory:
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>scp<replaceable> /opt/hds/ssh/hnaskey.pub </replaceable>[manager|supervisor]@<smu-ip>:/var/opt/mercury-main/home/[manager|supervisor]/ssh_keys/</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Access the SMU server:
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>ssh [manager|supervisor]@<smu-ip></userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Run the command to register the SSH keys:
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>ssh-register-public-key -u [manager|supervisor] -f ssh_keys/hnaskey.pub</userinput></screen>
|
|
</step>
|
|
<step>
|
|
<para>
|
|
Check the communication with HNAS in the Block Storage host:
|
|
</para>
|
|
<screen><prompt>$</prompt> <userinput>ssh -i<replaceable> /opt/hds/ssh/hnaskey</replaceable> [manager|supervisor]@<smu-ip> 'ssc <cluster_admin_ip0> df -a'</userinput></screen>
|
|
</step>
|
|
</procedure>
|
|
<para>
|
|
<literal><cluster_admin_ip0></literal> is "localhost" for
|
|
single node deployments. This should return a list of available
|
|
file systems on HNAS.
|
|
</para>
|
|
</section>
|
|
<section xml:id="hds-hnas-xml-config">
|
|
<title>Editing the XML config file:</title>
|
|
<orderedlist>
|
|
<listitem>
|
|
<para>
|
|
Set the "username".
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Enable SSH adding the line <literal>"<ssh_enabled>
|
|
True</ssh_enabled>"</literal> under <literal>
|
|
"<config>"</literal> session.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Set the private key path: <literal>"<ssh_private_key>
|
|
/opt/hds/ssh/hnaskey</ssh_private_key>" </literal>under
|
|
<literal>"<config>"</literal> session.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
If the HNAS is in a multi-cluster configuration set <literal>
|
|
"<cluster_admin_ip0>"</literal> to the cluster
|
|
node admin IP. In a single node HNAS, leave it empty.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
Restart the cinder service.
|
|
</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
</section>
|
|
<section xml:id="hds-hnas-additional-notes">
|
|
<title>Additional notes</title>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>
|
|
The <literal>get_volume_stats()</literal> function always
|
|
provides the available capacity based on the
|
|
combined sum of all the HDPs that are used in these
|
|
services labels.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
After changing the configuration on the storage,
|
|
the OpenStack Block Storage driver must be
|
|
restarted.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
HNAS iSCSI driver, due to an HNAS limitation,
|
|
allows only 32 volumes per target.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>
|
|
On Red Hat, if the system is configured to use SELinux, you
|
|
need to set <option>"virt_use_nfs = on"</option> for NFS
|
|
driver work properly.
|
|
</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
</section>
|