Overview of Seamless Stubbing and the Retrieval Service
The Retrieval Service is a Windows Server agent that must be deployed on
all file servers front-ending the storage you plan to tier to the cloud
with the 'seamless stubbing' option. With the Retrieval Service
installed, connectors can be configured in the HubStor Connector Service
that use the 'seamless stubbing' option. Any stub policies in such
connectors will then generate seamless stubs that transparently retrieve
for any application or user request to open the item. Seamless stub
look like this:
You can identify a seamless stub in two ways:
- The file icon is slightly faded in appearance, and
- The size on disk is only a few bytes and shows as zero bytes.
NOTE: In a DFS configuration, all file servers
should have the Retrieval Service installed. As well, in a failover
site, file servers should have the Retrieval Service installed so that
seamless stubs continue to work as expected in a failover scenario.
The Retrieval Service is exclusively used for seamless stubbing and performs the following functions:
- Intercepts the 'file open' command to see if an item is a seamless stub.
- If a requested item is a seamless stub, the Retrieval Service will
try to retrieve it from its local cache. If not in the cache, it will
download the item from HubStor and provide it in the request stream.
- If a local cache setting is configured, any retrieved content will
be temporarily kept in the cache for a configured time period to
optimize any subsequent opens of the same items.
- Cleans items from the local cache according to the retention setting.
: The Retrieval Service includes a feature
whereby you can exclude certain applications/processes from triggering
retrieval from your HubStor tenant. For example, file browsers,
antivirus, backup, and other programs that enumerate files can cause
performance issues if they make programmatic requests to open items
since they will invoke seamless stubs to perform retrievals. To learn
how to configure this setting, see HOW TO INSTALL AND CONFIGURE THE RETRIEVAL SERVICE
How to Install and Configure the Retrieval Service
The HubStor Retrieval Service can be downloaded from the HubStor Admin Portal, under 'Administration' and then 'Tools & Utilities'. Step 1 -- Run the Installer NOTE: The account you are logged in as on the machine to which you are installing the ...
Overview of Link-based Stubbing
HubStor's link-based stubbing method is intended for use with CIFS/NFS-based storage, such as NetApp or EMC Celerra. It can also work with Windows-based file shares. With HubStor's link-based stubbing, you can perform simple and effective ...
What permissions does the service account of the Connector Service require for seamless stubbing?
If your Connector Service is configured with file connectors that will create seamless stubs, the service account of the Connector Service will need to have local machine admin rights on the target file servers where seamless stubs will be created.
How to Install and Configure Link-based Stubbing
This article describes the steps necessary to configure link-based stubbing. Below are the high-level steps involved: Select a Windows Server to act as the Retrieval Server. This server can an existing Windows Server or a provisioned virtual ...
Security of Link-based Stubbing and Stub Share Permission
This article discusses the security aspects of the link-based stubbing feature. The 'Everyone' Permission on the Stub Share You will need to manually add the 'Everyone' group to the stub share with read/write permission, but then remove the NTFS ...