Veritas™ File System 5.0.1 Administrator's Guide

When the file system is frozen, any attempt to use the frozen file system, except

for a VX_THAW ioctl command, is blocked until a process executes the VX_THAW ioctl

command or the time-out on the freeze expires.

Getting the I/O size

VxFS provides the VX_GET_IOPARAMETERS ioctl to get the recommended I/O sizes

to use on a file system. This ioctl can be used by the application to make decisions

about the I/O sizes issued to VxFS for a file or file device.

See the vxtunefs(1M) and vxfsio(7) manual pages.

See “Tuning I/O” on page 51.

VxFS I/O Overview

Getting the I/O size