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vxdmptune, vxvoltune - display and change values of VxVM and DMP tunable parameters
vxdmptune
[-H]
[dmp_parameter]
vxdmptune
[-H]
dmp_parameter
value
vxvoltune
[-H]
[vxvm_parameter]
vxvoltune
[-H]
vxvm_parameter
value
The vxvoltune and vxdmptune utilities can be used to display
and change the values of Veritas Volume Manager (VxVM) and Dynamic Multipathing
(DMP) tunable parameters.
If no arguments are specified,
the commands display the currently defined values of all tunables
that have values specified in the configuration file. If the name of a tunable
parameter is specified, only its value is displayed. If a value is specified as
an additional argument, this is used to update the setting in the configuration
file. Any changes to this file are not applied until the system is shut down
and rebooted. The changes are persistent across reboots of the system.
-
-H
-
Displays detailed help on the usage of the command.
Display the current value of the vol_maxkiocount VxVM parameter:
vxvoltune vol_maxkiocount
Set the value of vol_maxkiocount to 8192:
vxvoltune vol_maxkiocount 8192
-
/etc/vx/vxdmp_tunables
-
Configuration file for DMP tunables.
-
/etc/vx/vxvm_tunables
-
Configuration file for VxVM tunables.
The following tunables may be set using vxdmptune:
-
dmp_enable_restore_daemon
-
-
dmp_failed_io_threshold
-
-
dmp_pathshitch_blks_shift
-
-
dmp_restore_daemon_cycles
-
-
dmp_restore_daemon_interval
-
-
dmp_restore_daemon_policy
-
-
dmp_retry_count
-
The following tunables may be set using vxvoltune:
-
maxiosize
-
-
vol_checkpt_default
-
-
vol_default_iodelay
-
-
vol_fmr_logsz
-
-
vol_max_nmpool_sz
-
-
vol_max_rdback_sz
-
-
vol_max_wrspool_sz
-
-
vol_max_volumes
-
-
vol_maxioctl
-
-
vol_maxkiocount
-
-
vol_maxparallelio
-
-
vol_min_lowmem_sz
-
-
vol_rvio_maxpool_sz
-
-
volcvm_smartsync
-
-
voldrl_max_drtregs
-
-
voldrl_max_seq_dirty
-
-
voldrl_min_regionsz
-
-
voliomem_chunk_size
-
-
voliomem_maxpool_sz
-
-
voliot_errbuf_dflt
-
-
voliot_iobuf_default
-
-
voliot_iobuf_limit
-
-
voliot_iobuf_max
-
-
voliot_max_open
-
-
volpagemod_max_memsz
-
-
volraid_minpool_size
-
vxintro(1M)
See the
Veritas Volume Manager Administrator's Guide
and
Veritas Volume Replicator Administrator's Guide
for a description of these tunables.
Last updated: 17 Jul 2008
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