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
See the Veritas Volume Manager Administrator's Guide.