Changing the VVR tunables
VVR provides you with a number of tunable parameters that can be tuned to a specific value, according to your requirements. For a detailed explanation of the VVR tunables, see the Veritas Volume Replicator Planning and Tuning Guide.
The following table provides you with a quick reference to the tunables that can be modified using the vxtune utility.
All tunables can be modified using the system-specific method.
Table: VVR Tunables
|
Tunable Name
|
Modifying Tunables Using the vxtune Utility |
Values |
|
vol_rvio_maxpool_sz
|
Yes
|
bytes
|
|
vol_min_lowmem_sz
|
Yes
|
bytes
|
|
vol_max_rdback_sz
|
Yes
|
bytes
|
|
vol_max_nmpool_sz
|
Yes
|
bytes
|
|
vol_max_wrspool_sz
|
Yes
|
bytes
|
|
vol_dcm_replay_sz
|
No
|
bytes
|
|
vol_nm_hb_timeout
|
No
|
bytes
|
|
voliomem_chunk_size
|
No
|
bytes
|
|
vol_vvr_use_nat
|
No
|
0 or 1
|
|
volpagemod_max_memsz
|
Yes
|
bytes
|
Note: |
The volpagemod_max_memsz is a VxVM tunable that is used to specify the amount of memory, measured in kilobytes, required for caching FastResync and cache object metadata. For more information on using this tunable, refer to "Performance Tuning and Monitoring" in the Veritas Volume Manager Administrator's Guide. |
You must reboot the system for the changes to take effect.
