Managing Segments; Migrating Segments - HP IBRIX X9720 Administrator's Manual

Tuning StoreAll clients locally
Linux clients. Use the ibrix_lwhost command to tune host parameters. For example, to set the
communications protocol:
ibrix_lwhost --protocol -p {tcp|udp}
To list host tuning parameters that have been changed from their defaults:
ibrix_lwhost --list
See the ibrix_lwhost command description in the
other available options.
Windows clients. Click the Tune Host tab on the Windows StoreAll client GUI. Tunable parameters
include the NIC to prefer (the default is the cluster interface), the communications protocol (UDP
or TCP), and the number of server threads to use. See the online help for the client if necessary.

Managing segments

When a file system is created, the servers accessing the file system are assigned ownership of the
storage segments used for the file system. Each server is responsible for managing the segments
it owns.
When the cluster is expanded, the StoreAll software attempts to maintain proper load balancing
and utilization in the following ways:
When servers are added, ownership of the existing segments is redistributed among the
available servers.
When storage is added, ownership of the new segments is distributed among the available
servers.
Occasionally you may need to manage the segments manually:
Migrate segments. This operation transfers ownership of segments to other servers. For example,
if a server is overloaded or unavailable, you can transfer its segments to another server that
can see the same storage.
Rebalance segments. This operation redistributes files across segments and can be used if
certain segments are filling up and affecting file system performance. See "Maintaining file
systems" in the for more information.
Evacuate segments. This operation moves the data in a segment to another segment. It is
typically used before removing storage from the cluster.

Migrating segments

Segment migration transfers segment ownership but it does not move segments from their physical
locations in the storage system. Segment ownership is recorded on the physical segment itself, and
the ownership data is part of the metadata that the Fusion Manager distributes to file serving nodes
and StoreAll clients so that they can locate segments.
To migrate segments on the GUI, select the file system on the Filesystems panel, select Segments
from the lower Navigator, and then click Ownership/Migration on the Segments panel to open
the Segment Ownership Migration Wizard.
HP StoreAll OS CLI Reference Guide
Managing segments 107
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