6.2 HP IBRIX 9000 Storage CLI Reference Guide (TA768-96070, December 2012)

ibrix_host_tune
Sets and lists tuning parameters for file serving nodes and IBRIX 9000 clients.
Description
CAUTION: The default values for the host tuning parameters are suitable for most cluster
environments. Because changing parameter values can alter file-system performance, HP
recommends that you exercise caution before implementing any changes, or do so only under the
guidance of HP technical support.
Host tunings are immediately executed for file serving nodes. For IBRIX 9000 clients a tuning
intention is stored in the Fusion Manager. When HP services start on a 9000 client, the client
obtains its settings from the Fusion Manager and implements them. If HP services are already
running on IBRIX 9000 clients when new parameter values are set, you can force the clients to
query the Fusion Manager for the settings by running ibrix_client or ibrix_lwhost --a
on the IBRIX 9000 clients, or by rebooting them.
To locally override host tunings on a single 9000 client, run ibrix_lwhost. All of the Fusion
Manager commands for tuning hosts include an -h HOSTLIST option that can take one or more
host groups. Setting host tunings on a host group is a convenient way to tune a set of IBRIX 9000
clients all at once. To set the same host tunings on all IBRIX 9000 clients, specify the built-in clients
host group.
Synopsis
Set tunings on file serving nodes and IBRIX 9000 clients:
ibrix_host_tune -S {-h HOSTLIST|-g GROUPLIST} -o OPTIONLIST
The command sets host tunings (OPTIONLIST) on specified file serving nodes and IBRIX 9000
clients (HOSTLIST), or on specified host groups (GROUPLIST). For example, to set host tunings
on all IBRIX 9000 clients, use -g clients.
Reset host tunings to their default values:
ibrix_host_tune -U {-h HOSTLIST|-g GROUPLIST} -n OPTIONS
The host tunings (OPTIONS) are reset on the specified file serving nodes and IBRIX 9000 clients
(HOSTLIST), or on specified host groups (GROUPLIST). For example, to set host tunings on all
IBRIX 9000 clients, use -g clients. The values that are restored depend on what is supplied to
the HOSTLIST option:
• File serving nodes: The default host tunings are restored.
• host groups: The host tunings that are in effect for the parent of the specified host groups are
restored.
• IBRIX 9000 clients: The host tunings that are in effect for the default clients host group are
restored.
Lists host tunings for the specified file serving nodes, IBRIX 9000 clients, and host groups:
ibrix_host_tune -l [-h HOSTLIST] [-n OPTIONS]
Only settings that differ from the default values are listed. To list settings for specific parameters,
include the -n OPTIONS option.
To list settings for all file serving nodes and IBRIX 9000 clients, omit the -h HOSTLIST option.
List host tunings for the specified groups:
ibrix_host_tune -l {-g GROUPLIST | –G }[-n OPTIONS]
Only settings that differ from the default values are listed. To list settings for specific parameters,
include the -n OPTIONS option.
ibrix_host_tune 91