Modifying and displaying the volpagemod_max_memsz parameter of vxtune
| Article:HOWTO60421 | | | Created: 2011-10-20 | | | Updated: 2012-02-03 | | | Article URL http://www.symantec.com/docs/HOWTO60421 |
You can modify the maximum memory measured in kilobytes that is allocated for cache object metadata. The default value for volpagemod_max_memsz is set to 6144 KB. The value that should be used is determined by the total size of volumes for which instant rollbacks are taken.
To modify the volpagemod_max_memsz parameter of vxtune
To modify the volpagemod_max_memsz parameter of vxtune, enter the following:
System> option modify vxtune volpagemod_max_memsz value
The following formula can be used to calculate the required value of volpagemod_ max_memsz:
size_in_KB=6 * (total_filesystem_size_in_GB) * (64/region_size_in_KB)
region_size can be set to 256 KB by default for large file systems.
For example, to modify the volpagemod_max_memsz parameter of vxtune, enter the following:
System> option modify vxtune volpagemod_max_memsz 12288
To display the value of the vxtune parameters
To display the value of the vxtune parameters, enter the following:
System> option show vxtune
For example, to display the value of the vxtune parameters, enter the following:
System> option show vxtune NODENAME TUNABLE VALUE(KB) -------- ------- --------- sfs_01 volpagemod_max_memsz 12288 sfs_02 volpagemod_max_memsz 12288
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Article URL http://www.symantec.com/docs/HOWTO60421
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