Can you do the following and re-post with what you have set for the following?

smitty devices -> SSA disks -> SSA Logical Disks -> Change/Show
Characteristics of an SSA Logical Disk -> select hdiskxx (where xx is the
hdisk where you are defining the volume)

Look at the following fields:

        1. queue depth.      This should be set to (# of disks in array-1)*3

        2. max_coalesce   This should be set to (# of disks in array
-1)*65536, converted to hex.

You may have trouble setting these devices  - they may report "device is
busy" if you try and change them. If so, re-post and I'll suggest ways to
get around this. We had one customer report numerous errors like this and
after changing these values, the errors went away.


At 03:58 PM 1/15/2003 -0500, you wrote:

Just tried formatting a new storage pool volume on the above system. First
time since upgrading to 5.1.5.x.

Seeing lots of errors:  LVDD LVM_IO_FAIL is the message.

Nothing in ERRPT but these errors. Nothing to point to a specific hardware
failure. Physically checked the drives (SSA) and can see any physical
indication of problems.

Tried searching IBMLINK with no success.


Anyone else seen this ?

Dave Canan
TSM Performance
IBM Advanced Technical Support
ddcanan AT us.ibm DOT com