Veritas Volume Manager maximum I/O size

When using VxFS with Veritas Volume Manager (VxVM), VxVM by default breaks up I/O requests larger than 256K. When using striping, to optimize performance, the file system issues I/O requests that are up to a full stripe in size. If the stripe size is larger than 256K, those requests are broken up.

To avoid undesirable I/O breakup, you can increase the maximum I/O size by changing the value of the vol_maxio parameter in the /etc/modprobe.conf file.