VxVM 5.1 SP1 does not support snapshots of RAID 5 volumes.

Dirty Region Logging

Dirty Region Logging (DRL) keeps track of the regions that have been changed because I/O writes to a mirrored volume. The DRL uses this information to recover only those portions of the volume that need to be recovered, thereby speeding up recovery after a system crash.

SmartMove™ Feature

SmartMove reduces the time and I/O required to attach or reattach a plex to an existing VxVM volume, in the specific case where a VxVM volume has a VxFS file system mounted on it. The SmartMove feature uses the VxFS information to detect free extents and avoids copying them.

Enhancements to the Dynamic Multipathing Feature

This release provides a number of enhancements to the DMP features of VxVM. These enhancements simplify administration and improve display of detailed information about the connected storage. Following are the enhancements to the DMP feature:

Dynamic multipathing attributes are now persistent

Improved dynamic multipathing device naming

Default behavior modified for I/O throttling

Specifying a minimum number of active paths

Enhanced listing of subpath

Enhanced I/O statistics

Making DMP restore options persistent

New log file location for DMP events

Extended device attributes displayed in the vxdisk list command

Displaying the use_all_paths attribute for an enclosure

Viewing information about the ASLs installed on the system

Displaying the number of LUNs in an enclosure

Displaying the LUN serial number

Displaying HBA details

New exclude and include Options for the vxdmpadm command

New command for reporting DMP node information

Setting attributes for all enclosures

Support for ALUA JBOD devices

VxVM Powerfail Timeout (PFTO) feature disabled in the HP-UX Native Multipathing Devices

By default, the use of PFTO is now disabled in the HP-UX native multipathing devices. As a result, the native multipathing disk I/O can consume additional service time to complete an I/O successfully. In case of DMP devices, the use of PFTO is enabled by default.

For information on recommendations to maintain high levels of I/O robustness, refer to “I/O Robustness Recommendations” (page 62).

Support for LVM version 2 Volume Groups

The LVM version 2 volume groups are now partially supported. VxVM now identifies and protects the LVM version 2 volume groups. However, the LVM version 2 volume groups cannot be initialized or converted.

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HP Serviceguard Storage Management Suite for VERITAS manual Veritas Volume Manager VxVM