VERITAS Volume Manager 4.1 Release Notes (5900-0591, March 2010)

VERITAS Volume Manager 4.1 Release Notes
Known Problems and Workarounds
Chapter 1 33
have the same private region, and VxVM allows you to import only one of them;
by default, it chooses P-Vol. If you want, however, you can import the split BC
(S-Vol) onto a secondary host.
VxVM and Older Quantum Disk Drives
• Problem: The VxVM makes use of the kernel-to-kernel pass through ioctl SCSI
command feature in HP-UX. VxVM issues SCSI inquiry commands to devices on the
system to recognize individual disks and sort out host to device connection pathways.
Some older Quantum disks (models PD210S and PD425S) do not respond properly to
SCSI inquiry command when the device is in certain states. As a consequence, these
devices are not recognized by VxVM and, as such, cannot be used as disks for VxVM. A
vxdisk command may list the device in error state or may not list at all.
• Workaround: Do not attempt to define the device for VxVM.
Adding Swap Space Using VxVM Volumes
The HP System Administration Manager (SAM) currently does not have the capability to add
swap space using VxVM volumes. Please refer to the VERITAS File System (HP
OnlineJFS/JFS) 4.1 and VERITAS Volume Manager 4.1 Installation Guide for more
information and workarounds for this problem.
Enclosure-based Naming on Persistent Simple or Nopriv Disks
On a system that has persistent simple or nopriv disks, these disks may be put into an error
state if you change to enclosure-based naming. To recover these disks, run the vxdarestore
command. For more information, refer to Issues Regarding Persistent Simple/Nopriv Disks
with Enclosure-Based Naming in the VERITAS Volume Manager 4.1 Administrator’s Guide
and the vxdarestore(1M) manual page.
Unsupported Disk Arrays
To ensure that DMP is set up correctly on a multiported JBOD or other disk array that is not
supported by VxVM, use the procedure given in Adding Unsupported Disk Arrays to the
DISKS Category" in the Administering Disks chapter of the VERITAS Volume Manager
Administrator’s Guide. Otherwise, VxVM treats the independent paths to the disks as
separate devices, which can result in data corruption.
Hitachi Arrays in Active/Active Mode
When Hitachi DF400 and DF500 arrays are configured in Active/Active mode, performance is
degraded.