Veritas 5.0.1 Installation Guide, HP-UX 11i v3, First Edition, November 2009

nodes in the cluster. Distributing the recovery tasks is desirable in some situations so that
the CVM master can avoid an I/O or CPU bottleneck.
• Campus Cluster enhancements
The campus cluster feature provides the capability of mirroring volumes across sites, with
hosts connected to storage at all sites through a Fibre Channel network. In this release, the
following enhancements have been made to the campus cluster feature:
— Site Tagging of disks or Enclosures
— Automatic Site Tagging
— Site Renaming
• Estimated Required Time Displayed During Volume Conversion
During a volume conversion operation, before the conversion is committed, the
vxvmconvert command displays the estimated time required.
• The vxsited daemon Renamed to vxattachd
The vxsited daemon is renamed as the vxattachd daemon. The vxattachd daemon
now also handles automatic reattachment and resynchronization for plexes.
• Automatic Plex Attachment
When a mirror plex encounters irrecoverable errors, VxVM detaches the plex from the
mirrored volume. By default, VxVM automatically reattaches the affected mirror plexes
when the underlying failed disk or LUN becomes visible.
VxVM 5.0.1 on HP–UX 11i v3
For more information on features that VxVM 5.0.1 supports on HP-UX 11i v3, see the Veritas
Volume Manager 5.0.1 Release Notes, at http://www.docs.hp.com.
Architecture of VxVM
VxVM operates as a subsystem between the HP-UX operating system and other data management
systems, such as file systems and database management systems. VxVM is layered on top of the
operating system and is dependent on it for the following:
• Physical access to disks
• Device handles
• VM disks
• Multipathing
VxVM Daemons
VxVM relies on the following daemons for its operation:
• vxconfigd – The VxVM configuration daemon maintains disk and disk group configuration
information, communicates configuration changes to the kernel, and modifies the
configuration information stored on the disks.
• vxiod – The VxVM I/O daemon provides extended I/O operations without blocking the
calling processes.
• vxrelocd – The hot-relocation daemon monitors VxVM for events that affect redundancy,
and performs hot-relocation to restore redundancy.
• vxattachd – The vxattachd daemon handles automatic reattachment and
resynchronization for plexes.
16 Introduction