QUESTION:
My customer recently put in an additional 128 MB of memory on a 590.
When they rebooted, they received a 404 on the LED. It hung on this
values which I could not find in the Problem Solving Guide and Ref..
They proceeded to reboot the system and everything was fine. What does
this undocumented LED code mean? Also at about the same time has the
reboot there several of the following errors in the error log.
ERROR LABEL: DISK_ERR4
ERROR ID: 1581762B
Date/Time: Mon Mar 28 11:11:55
Sequence Number: 144837
Machine Id: 000011187000
Node Id: 000011187000
Class: H
Type: TEMP
Resource Name: hdisk0
Resource Class: disk
Resource Type: 1000mb
Location:
VPD:
Error Description
DISK OPERATION ERROR
ERROR LABEL: SCSI_ERR2
ERROR ID: C14C511C
Sequence Number: 144836
Machine Id: 000011187000
Node Id: 000011187000
Class: H
Resource Name: scsi0
Resource Class: adapter
Resource Type: hscsi
Location: 00-08
We have several of the SCSI_ERR2, but everything seems to be fine.
The machine is up and running in Multiuser mode. Should we be
concerned?
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A: 404 LED / SCSI / DISK errors
It would appear you have two, possibly three, unrelated problems.
If the 404 occurred immediately on powering up, it means that a power
supply problem was present. The chart on page 2-1520-2 of the 7013
POWERstation and POWERserver Installation and Service Guide
(SA23-2622-07) details these conditions.
A 4 in the first position means that the fan connected to the P49C
connector failed. The 0 in the second position does not represent a
power failure. The 4 in the third position means that there was a
power failure inside the power supply. Since the machine came up
fine after it was rebooted, no actual hardware faults appears present.
Rather, it seems that the power to the RISC was interrupted or not
conditioned properly for a very brief period of time.
If the 404 happened later during the IPL sequence (during the 100 or
200 series of IPL codes), then the answer is not so readily found.
If this is the case, please contact Hardware Services.
The error codes you have included in your item might or might not be
related. However, they are not serious. The DISK_ERR4 is a bad block
error and is fully recoverable. This error happens when AIX attempts
to write to a disk and finds a bad spot at the write destination. AIX
marks this block as unusable and recovers by writing the data in an
alternate area reserved for such errors. This situation is generally
no cause for alarm - about 95% of a disk is actually useable. Bad
blocks account for the remaining 5 . However, if you start noticing
an increasing frequency of error 158172B, this could mean that you are
getting low on disk space.
The DISK_ERR4 message could also arise from SCSI bus cabling and/or
termination problems. In this case, the DISK_ERR4 message is directly
tied to the SCSI_ERR2 (C14C511C) error - (both are SCSI errors).
These errors can result from improperly terminated SCSI buses. They
can also arise from bad cables, loose connectors, and SCSI buses that
exceed the maximum supported bus lengths.
To resolve these errors, make sure that the proper terminator is on
the SCSI bus (for example, a SCSI-1 bus requires a SCSI-1 terminator.
In addition, a single-ended terminator will not work on a differential
bus - and differential terminator will not work on a single-ended
bus).
Also, make sure all cables are firmly connected and are within
supported SCSI bus lengths. The supported SCSI bus lengths are:
SCSI-1 Single-ended - 6m
SCSI-2 Single-ended - 3m
SCSI-2 Differential - 19m
You may also wish to verify that the cables themselves are
functioning properly. One way to do this is to locate a cable that
you are sure is not defective. Then, systematically replace each
cable in the SCSI chain and see if you can duplicate the SCSI errors.
(Note: be sure to power down the system when plugging and unplugging
adapters and devices. "Hot plugging" SCSI devices or cables is not
supported and can easily damage both the SCSI adapters and devices).
Note: if you feel that the DISK_ERR4 errors are not related to the
above SCSI errors, you may wish to certify the disk drive. This can
be done through the diagnostic Service Aids. The disk certification
should report on whether or not the drive is in good condition.
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This item was created from library item Q658314 CRFLR
Additional search words:
CRFLR HARDWARE IX LED MAY94 OZNEW REBOOT RECEIVE RECEIVED RISCSYSTEM
RISCSYSU SYS SYSTEM UNIT UPON 404 590
WWQA: ITEM: RTA000041910 ITEM: RTA000041910
Dated: 10/1996 Category: RISCSYSU
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