While the file system is mounted, any I/O parameters canbe changed using the vxtunefs command which can have tunables specified onthe command line or can read them from the /etc/vx/tunefstab file.See the vxtunefs(1M) and tunefstab(4) manual pages.The vxtunefs command can be used to print the current values of the I/Oparameters.To print the values, type the following command:# vxtunefs -p /mnt1The following is an example tunefstab file:/dev/vx/dsk/userdg/netbackupread_pref_io=128k,write_pref_io=128k,read_nstream=4,write_nstream=4/dev/vx/dsk/userdg/metasaveread_pref_io=128k,write_pref_io=128k,read_nstream=4,write_nstream=4 ![]() The tunefstab file overrides any valuesobtained from VxVM. The mount command reads the /etc/vx/tunefstab file and downloadsany parameters specified for a file system. Typically, datastreaming applications that access large files see the largest benefit from tuningthe file system.Veritas Volume Manager queriesVeritas Volume Manager (VxVM) receives the following queries duringconfiguration:■The file system queries VxVM to determine the geometry of the underlyingvolume and automatically sets the I/O parameters.Note: When using file systems in multiple volume sets, VxFS sets the VxFStunables based on the geometry of the first component volume (volume 0) inthe volume set.■The mount command queries VxVM when the file system is mounted anddownloads the I/O parameters.If the default parameters are not acceptable or the file system is being used withoutVxVM, then the /etc/vx/tunefstab file can be used to set values for I/Oparameters. ![]() ![]() 50VxFS performance: creating, mounting, and tuning file systemsTuning I/OTuning VxFS I/O parametersVxFS provides a set of tunable I/O parameters that control some of its behavior.These I/O parameters are useful to help the file system adjust to striped or RAID-5volumes that could yield performance superior to a single disk.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |