Veritas File System 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

For file data read and write errors, VxFS sets the VX_DATAIOERR flag in the
super-block. For metadata read errors, VxFS sets the VX_FULLFSCK flag in the
super-block. For metadata write errors, VxFS sets the VX_FULLFSCK and
VX_METAIOERR flags in the super-block and may mark associated metadata as bad
on disk. VxFS then prints the appropriate error messages to the console.
See “File system response to problems” on page 211.
You should stop the file system as soon as possible and repair the condition causing
the I/O error. After the problem is repaired, run fsck and mount the file system
again. Select nodisable if you want to implement the policy that most closely
resembles the error handling policy of the previous VxFS release.
The wdisable and mwdisable policies
If wdisable (write disable) or mwdisable (metadata-write disable) is selected, the
file system is disabled or degraded, depending on the type of error encountered.
Select wdisable or mwdisable for environments where read errors are more likely
to persist than write errors, such as when using non-redundant storage. mwdisable
is the default ioerror mount option for local mounts.
See the mount_vxfs(1M) manual page.
The mdisable policy
If mdisable (metadata disable) is selected, the file system is disabled if a metadata
read or write fails. However, the file system continues to operate if the failure is
confined to data extents. mdisable is the default ioerror mount option for cluster
mounts.
The largefiles|nolargefiles option
The section includes the following topics :
■ Creating a file system with large files
■ Mounting a file system with large files
■ Managing a file system with large files
VxFS supports files larger than 2 gigabytes. The maximum file size that can be
created is 2 terabytes.
Note: Applications and utilities such as backup may experience problems if they
are not aware of large files. In such a case, create your file system without large
file capability.
35VxFS performance: creating, mounting, and tuning file systems
Mounting a VxFS file system