dmesg errors

[gobi23]

seen some dmesg errors. what could this mean??? please help

Dec 28 14:36
...
700 Recovered.
LVM: VG 64 0x010000: PVLink 31 0x0a0100 Recovered.
LVM: VG 64 0x010000: PVLink 31 0x080100 Recovered.
LVM: VG 64 0x020000: PVLink 31 0x0a3300 Recovered.
LVM: VG 64 0x020000: PVLink 31 0x083300 Recovered.
LVM: VG 64 0x020000: PVLink 31 0x0a1100 Recovered.
LVM: VG 64 0x020000: PVLink 31 0x081100 Recovered.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the diaglogd daemon is not active, use the Daemon Startup command
in stm to start it.
If the diaglogd daemon is active, use the logtool utility in stm
to determine which I/O subsystem is logging excessive errors.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 2 I/O error entries were lost.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the diaglogd daemon is not active, use the Daemon Startup command
in stm to start it.
If the diaglogd daemon is active, use the logtool utility in stm
to determine which I/O subsystem is logging excessive errors.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 1 I/O error entries were lost.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the diaglogd daemon is not active, use the Daemon Startup command
in stm to start it.
If the diaglogd daemon is active, use the logtool utility in stm
to determine which I/O subsystem is logging excessive errors.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 3 I/O error entries were lost.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 0 I/O error entries were lost.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the diaglogd daemon is not active, use the Daemon Startup command
in stm to start it.
If the diaglogd daemon is active, use the logtool utility in stm
to determine which I/O subsystem is logging excessive errors.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 4 I/O error entries were lost.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the diaglogd daemon is not active, use the Daemon Startup command
in stm to start it.
If the diaglogd daemon is active, use the logtool utility in stm
to determine which I/O subsystem is logging excessive errors.
LVM: Performed a switch for Lun ID = 0 (pv = 0x0000000258794000), from raw device 0x1f062200 (with priority: 0, and current flags: 0x40) to raw device 0x1f082200 (with priority: 1, and current flags: 0x0).
LVM: VG 64 0x030000: PVLink 31 0x062200 Failed! The PV is still accessible.
LVM: Performed a switch for Lun ID = 0 (pv = 0x0000000258794000), from raw device 0x1f082200 (with priority: 1, and current flags: 0x0) to raw device 0x1f062200 (with priority: 0, and current flags: 0x80).
LVM: VG 64 0x030000: PVLink 31 0x062200 Recovered.
DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility is no longer receiving excessive
errors from the I/O subsystem. 8 I/O error entries were lost.

[Dennis Handly]

Are you still seeing them in syslog.log?

[gobi23]

yes what could this mean? thanks

[Bill Hassell]

Something went wrong with one of the links between your computer and your disk. It appears that you have at least one alternate link and HP-UX switched to working link. Has someone removed a cable?

[basant]

Threse error comes , when there is some issue with physical disk 

1. check for I/O error in /var/adm/syslos/syslog.log

2.  check no_hw in following command output

      # ioscan -fnC disk | grep -i no_hw

3. # vgdisplay -v

     in the output check  for disk showing unavailable.