HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 (September 2011)

0xe00000013121c120 slvmp_process_bad_reply+0x280
0xe000000000ee19f0 invoke_callouts_for_self+0x460
0xe000000000ec6070 soft_intr_handler+0x1c0
Oxe000000000eed820 external_interrupt+Ox4b0
Oxe000000001e66780 bubbledown+OxO
Oxe000000000e9cba1 idle+Ox7b1
Severity: Critical
Corrective Action: Currently, none.
LVM snapshot shows sync'ed even if the disk is disabled
Defect ID: QXCR1001132689
Problem: Logical volume status of fully allocated snapshot is shown as
available/sync'ed when the disk where the snapshot is present is not
accessible.
Severity: Serious
Corrective Action: Currently, none.
Limitations
This section provides a list of limitations as known to HP at time of publication.
• Logical volumes that have snapshots associated with them might experience an increase in
latencies associated with writes. This is also applicable for writes on (writable) snapshots
themselves.
• With the HP-UX 11i v3 September 2010 Update release, when the number of extents remaining
in a space-efficient snapshot logical volume’s pre-allocated pool falls beyond a certain internally
computed threshold, by default, LVM tries to increase the pre-allocated pool size by threshold
value. This does not guarantee that snapshot will not become over-commit. For example, if
the I/O rate is faster than auto pre-allocation, the snapshot becomes over-commit.
If auto pre-allocation is manually disabled, a message is logged in the syslog. This message
is displayed to inform you that further unsharing of data between the snapshot and its successors
might end up depleting the extents in the pre-allocated pool and lead to the snapshot and its
predecessors being marked as inoperative. As soon as you see this message in the syslog,
you must increase the pre-allocated extent pool size for the snapshot logical volume.
• For more limitations on snapshots, see the Using LVM Logical Volume Snapshots white paper.
Installation requirements
This section describes the installation requirements for this release.
Required hardware
LVM and MirrorDisk/UX have no hardware requirements beyond the requirements of the HP-UX
11i v3 operating system. Both products run on all supported HP 9000 and HP Integrity servers.
Required software
Because LVM is installed with the HP-UX 11i v3 operating environment, there are no software
requirements beyond the requirements of the HP-UX 11i v3 operating system. MirrorDisk/UX
requires the BaseLVM™ product.
Required patches
In HP-UX 11i v3, LVM and MirrorDisk/UX do not require any software patches.
For each of the following subsystems, you can download patches from the following website:
Installation requirements 7