openstack/cinder
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Dell EMC SC: dell-storagecenter-driver docs updated

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Document has been updated to include direct connect support. The
Dell EMC SC driver can be configured to point at a Storage Center
directly rather than through a DSM aggregator. This addresses
minimum requirements and limitation.

Change-Id: I0a0095235685c8f6dc6d9cd88b27d454641da387
This commit is contained in:
Tom Swanson 2018-04-02 15:31:51 -05:00
parent 9e283258fe
commit 4cfdbc3f5f
1 changed files with 28 additions and 10 deletions
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38
doc/source/configuration/block-storage/drivers/dell-storagecenter-driver.rst
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@ -5,11 +5,22 @@ Dell EMC SC Series Fibre Channel and iSCSI drivers
The Dell EMC Storage Center volume driver interacts with configured Storage
Center arrays.
The Dell EMC Storage Center driver manages Storage Center arrays through
the Dell EMC Storage Manager (DSM). DSM connection settings and Storage
Center options are defined in the ``cinder.conf`` file.
The Dell EMC Storage Center driver manages a Storage Center array via the
Dell EMC Storage Manager (DSM) Data Collector or by directly connecting to
the Storage Center at the cost of replication and Live Volume functionality.
Also note that the directly connecting to the Storage Center is only
supported with Storage Center OS 7.1.1 or later. Any version of Storage
Center OS supported by DSM is supported if connecting via the Data
Collector.
Prerequisite: Dell EMC Storage Manager 2015 R1 or later must be used.
Driver configuration settings and Storage Center options are defined in the
``cinder.conf`` file.
Prerequisites:
- Storage Center OS version 7.1.1 or later and OpenStack Ocata or later
must be used if connecting directly to the Storage Center.
- Dell EMC Storage Manager 2015 R1 or later if connecting through DSM.
Supported operations
~~~~~~~~~~~~~~~~~~~~
@ -27,8 +38,9 @@ volume operations:
- Create, delete, list and update a consistency group.
- Create, delete, and list consistency group snapshots.
- Manage an existing volume.
- Failover-host for replicated back ends.
- Create a replication using Live Volume.
- Replication (Requires DSM.)
- Failover-host for replicated back ends. (Requires DSM.)
- Create a replication using Live Volume. (Requires DSM.)
Extra spec options
~~~~~~~~~~~~~~~~~~
@ -36,7 +48,7 @@ Extra spec options
Volume type extra specs can be used to enable a variety of Dell EMC Storage
Center options. Selecting Storage Profiles, Replay Profiles, enabling
replication, replication options including Live Volume and Active Replay
replication.
replication. (Replication options are available when connected via DSM.)
Storage Profiles control how Storage Center manages volume data. For a
given volume, the selected Storage Profile dictates which disk tier
@ -171,7 +183,7 @@ Use the following instructions to update the configuration file for iSCSI:
volume_backend_name = delliscsi
# The iSCSI driver to load
volume_driver = cinder.volume.drivers.dell_emc.sc.storagecenter_iscsi.SCISCSIDriver
# IP address of DSM
# IP address of the DSM or the Storage Center if attaching directly.
san_ip = 172.23.8.101
# DSM user name
san_login = Admin
@ -206,7 +218,7 @@ channel:
# The FC driver to load
volume_driver = cinder.volume.drivers.dell_emc.sc.storagecenter_fc.SCFCDriver
# IP address of the DSM
# IP address of the DSM or the Storage Center if attaching directly.
san_ip = 172.23.8.101
# DSM user name
san_login = Admin
@ -251,6 +263,8 @@ to use the secondary. It will continue to use the secondary until the volume
service is restarted or the secondary fails at which point it will attempt to
use the primary.
Note: Requires two DSM Data Collectors.
Replication configuration
~~~~~~~~~~~~~~~~~~~~~~~~~
@ -271,6 +285,10 @@ slow things down, however.
A volume is only replicated if the volume is of a volume-type that has
the extra spec ``replication_enabled`` set to ``<is> True``.
Warning: replication_device requires DSM. If this is on a backend that
is directly connected to the Storage Center the driver will not load
as it is unable to meet the replication requirement.
Replication notes
~~~~~~~~~~~~~~~~~
@ -314,7 +332,7 @@ This option allows one to set a default Server OS type to use when creating
a server definition on the Dell EMC Storage Center.
When attaching a volume to a node the Dell EMC Storage Center driver creates a
server definition on the storage array. This defition includes a Server OS
server definition on the storage array. This definition includes a Server OS
type. The type used by the Dell EMC Storage Center cinder driver is
"Red Hat Linux 6.x". This is a modern operating system definition that supports
all the features of an OpenStack node.