Help with failed Microcode...

Posted on 2008-10-22
Last Modified: 2013-11-17
Just ran an microcode update out of the web-based system manager and needed two updates. One on my tape drive (rmt0) and the other on my raid card. The card worked perfect, but the tape drive one failed? Now I can no longer see my tape drive.

lsdec -Cc tape

rmt0 Defined 04-08-00-0,0 LVD SCSI Tape Drive
rmt1 Available 06-08-00-2,0 Other SCSI Tape Drive

Is there a way to undo the microcode on that tape drive?

The internal tape drive is a VXA 320
The server is a pseries model 520

Any help would be great.. Many, many thanks in advance.
Question by:jlinde
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
LVL 10

Expert Comment

ID: 22783561
Can you access the unit as rmt0? ie. try to rewind a tape. mt -f /dev/rmt1 rewind.

I don't see confirmed that you only have one tape drive but it looks like you didn't remove and readd the tape drive after the update.

Try this

rmdev  -l 'rmt1' '-d'
rmdev  -l 'rmt0' '-d'
mkdev  -l 'rmt0'

Then try to update microcode again.
LVL 10

Expert Comment

ID: 22783562
Sorry I meant to write: can you access the unit as rmt1?

Author Comment

ID: 22785496
Ok, so I have an internal tape drive (rmt0) and an external tape drive (rmt1).

I ran the commands you posted:
rmdev  -l 'rmt0' '-d'
mkdev  -l 'rmt0'

This now has completely removed the internal tape drive (rmt0). How do I get that back now?

Many Thanks Again -
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

LVL 10

Expert Comment

ID: 22804711
This should've brought back the tape unit. Probably the failed microcode upload made the drive unusable. Best chance is to contact IBM support and have the drive replaced if it's still in warranty.
LVL 62

Accepted Solution

gheist earned 500 total points
ID: 22821240
Did you update using microcode on media or over SCSI.
What diagnostics does tape LCD show?
Does powering it off and on change that?
You can ask IBM for microcode tape, or create one using diag on other AIX system with compatible drive, or using ITDT on windows.

Run errpt -a to see unattended  CRC errors leading to failure.

Author Comment

ID: 22830743
Powering the unit all the way down then back on cleared any of the issues taking place. I was able to see the tape drive after this and the microcode was updated? Not to sure why it got so funky after the failed microcode and a simply reboot did not clear any of the issues.

Thanks for all who posted.

LVL 62

Expert Comment

ID: 22830855
Modern tape drives are computers on their own. When you reinstall their OS they may need that magic touch.
Verify if it has new microcode and next time use attended method with microcode tape...

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In tuning file systems on the Solaris Operating System, changing some parameters of a file system usually destroys the data on it. For instance, changing the cache segment block size in the volume of a T3 requires that you delete the existing volu…
A metadevice consists of one or more devices (slices). It can be expanded by adding slices. Then, it can be grown to fill a larger space while the file system is in use. However, not all UNIX file systems (UFS) can be expanded this way. The conca…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.
Suggested Courses

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question