HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 84)

84 2 - C ONFIGURING THE HP EFS WAN A CCELERATOR
‹ Local Mode. Provides read-write access to a given file share hosted on the
branch-office or remote HP EFS WAN Accelerator. CIFS clients mapping a
Local mode file share have read-write access to that share. Changes made to the
share are sent back and update the origin server. For any remote path, there can
exist only one local share on a HP EFS WAN Accelerator, this prevents
conflicting data from being written to the same path.
NOTE: In Local Mode, the HP EFS WAN Accelerator copy of the data is the master copy, do
not make changes to the shared files from the origin server while in Local mode. Changes are
propagated from the remote office hosting the share to the origin server.
NOTE: When you configure a local share, a text file (._rbt_share_lock. txt), is created on the
origin server that keeps track of which HP EFS WAN Accelerator owns the share. Do not
remove this file. If you remove the ._rbt_share_lock. txt file on the origin file server, PFS will
not function properly.
‹ Stand-Alone Mode. Provides read-write access to data on a branch office HP
EFS WAN Accelerator. There may or may not be an origin server at the data
center with which the share has to synchronize data to. For example, if you want
to load temporary data that does not need to be backed up at a data center, you can
create a share in Stand-Alone mode with or without a remote path.
‹ Global Mode. HP EFS WAN Accelerator optimization without PFS enabled.
When to Use PFS PFS can be configured with any number of file shares in different modes. Shares are
configured into different operating modes based on the use of your data:
‹ For environments seeking to broadcast a set of read-only files to many users at
different sites. Broadcast Mode quickly transmits a read-only copy of a file from
the origin server to your remote offices.
‹ For environments that need to efficiently and transparently copy data created at a
remote site to a central data center, perhaps where tape archival resources are
available to backup the data. Local Mode enables read-write access at remote
offices to update files on the origin file server.
‹ For network environments where it is more effective to maintain a separate copy
of files that are accessed locally by the clients at the remote site. In Stand-Alone
Mode, create a proxy file server at a remote office using the remote office HP
EFS WAN Accelerator, creating extra storage space.
If any of the above advantages can benefit your environment, then enabling PFS in the
HP EFS WAN Accelerator is appropriate.
When to use
Global Mode Deploying the HP EFS WAN Accelerator without PFS is considered global mode. In
global mode, the HP EFS WAN Accelerator performs its standard optimization of data
over the WAN.
Evaluate whether PFS is suitable for your network needs: