IBM FlashSystem volume driver¶
The volume driver for FlashSystem provides OpenStack Block Storage hosts with access to IBM FlashSystems.
Supported operations¶
These operations are supported:
- Create, delete, attach, and detach volumes.
- Create, list, and delete volume snapshots.
- Create a volume from a snapshot.
- Copy an image to a volume.
- Copy a volume to an image.
- Clone a volume.
- Extend a volume.
- Get volume statistics.
- Manage and unmanage a volume.
Configure FlashSystem¶
Configure storage array¶
The volume driver requires a pre-defined array. You must create an array on the FlashSystem before using the volume driver. An existing array can also be used and existing data will not be deleted.
Note
FlashSystem can only create one array, so no configuration option is needed for the IBM FlashSystem driver to assign it.
Configure user authentication for the driver¶
The driver requires access to the FlashSystem management interface using
SSH. It should be provided with the FlashSystem management IP using the
san_ip flag, and the management port should be provided by the
san_ssh_port flag. By default, the port value is configured to be
port 22 (SSH).
Note
Make sure the compute node running the cinder-volume driver has SSH
network access to the storage system.
Using password authentication, assign a password to the user on the FlashSystem. For more detail, see the driver configuration flags for the user and password here: Enable IBM FlashSystem FC driver or Enable IBM FlashSystem iSCSI driver.
There are some common configuration options for either driver:
| Flag name | Type | Default | Description |
|---|---|---|---|
san_ip |
Required | Management IP or host name | |
san_ssh_port |
Optional | 22 | Management port |
san_login |
Required | Management login user name | |
san_password |
Required | Management login password |
IBM FlashSystem FC driver¶
Data Path configuration¶
Using Fiber Channel (FC), each FlashSystem node should have at least one
WWPN port configured. If the flashsystem_multipath_enabled flag is
set to True in the Block Storage service configuration file, the driver
uses all available WWPNs to attach the volume to the instance. If the flag is
not set, the driver uses the WWPN associated with the volume’s preferred node
(if available). Otherwise, it uses the first available WWPN of the system. The
driver obtains the WWPNs directly from the storage system. You do not need to
provide these WWPNs to the driver.
Note
Using FC, ensure that the block storage hosts have FC connectivity to the FlashSystem.
Enable IBM FlashSystem FC driver¶
Set the volume driver to the FlashSystem driver by setting the
volume_driver option in the cinder.conf configuration file,
as follows:
volume_driver = cinder.volume.drivers.ibm.flashsystem_fc.FlashSystemFCDriver
To enable the IBM FlashSystem FC driver, configure the following options in the
cinder.conf configuration file:
| Configuration option = Default value | Description |
|---|---|
flashsystem_connection_protocol = FC |
(String) Connection protocol should be FC. (Default is FC.) |
flashsystem_multihostmap_enabled = True |
(Boolean) Allows vdisk to multi host mapping. (Default is True) |
IBM FlashSystem iSCSI driver¶
Network configuration¶
Using iSCSI, each FlashSystem node should have at least one iSCSI port configured. iSCSI IP addresses of IBM FlashSystem can be obtained by FlashSystem GUI or CLI. For more information, see the appropriate IBM Redbook for the FlashSystem.
Note
Using iSCSI, ensure that the compute nodes have iSCSI network access to the IBM FlashSystem.
Enable IBM FlashSystem iSCSI driver¶
Set the volume driver to the FlashSystem driver by setting the
volume_driver option in the cinder.conf configuration file, as
follows:
volume_driver = cinder.volume.drivers.ibm.flashsystem_iscsi.FlashSystemISCSIDriver
To enable IBM FlashSystem iSCSI driver, configure the following options
in the cinder.conf configuration file:
| Configuration option = Default value | Description |
|---|---|
flashsystem_connection_protocol = FC |
(String) Connection protocol should be FC. (Default is FC.) |
flashsystem_iscsi_portid = 0 |
(Integer) Default iSCSI Port ID of FlashSystem. (Default port is 0.) |
flashsystem_multihostmap_enabled = True |
(Boolean) Allows vdisk to multi host mapping. (Default is True) |
Note
On the cluster of the FlashSystem, the iscsi_ip_address column is the
seventh column IP_address of the output of lsportip.
Note
On the cluster of the FlashSystem, port ID column is the first
column id of the output of lsportip,
not the sixth column port_id.
Limitations and known issues¶
IBM FlashSystem only works when:
open_access_enabled=off
Note
The flashsystem_multihost_enabled setting allows the driver to map a
vdisk to more than one host at a time. This scenario occurs during
migration of a virtual machine with an attached volume; the volume is
simultaneously mapped to both the source and destination compute hosts. If
your deployment does not require attaching vdisks to multiple hosts,
setting this flag to False will provide added safety.
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