Re: Question about Load Source (V5R4) misbehaviour. (Rene K.)

*It Depends* :-)

I can't recall the line in the silicon where this changed but it has not always been so. Perhaps Sue Baker has the official line.

For a 2726, 2740 or 2741 card I believe the correct answer is: "Got backups?" But somewhere between those cards and today the system can be IPLed from 'The Stripe' (I like that designation) and of course it will be slow and a rebuild can then be initiated.

I'm thinking perhaps it was the 2757 that was first able to do this but fuzzy memory on that.

We worked through this on at least two customer issues in the model 6xx days which is when those older cards were around and reloads were required.


- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 7/10/2014 4:23 PM, Monty G. James wrote:

The short answer is no you are not screwed.

This is the sort version:

For a failed load source and a powered off system.

If you are mirrored removed the failed load source and move its mirror to the load source position, insert new disk in mirrored position power on system and resume mirror.

If you are raided replace the failed disk, power on system, wait for an extremely long IPL, you will be IPLing from the stripe, perform rebuild of raid.

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message: 1
date: Thu, 10 Jul 2014 06:46:01 -0700
from: "Rene K." <kraats@xxxxxxxxx>
subject: Question about Load Source (V5R4) misbehaviour.

Hi all,

After Googling and reading PDF's, I'm still not clear on the LS recovery subject.
It seems that, no matter if you use parity, mirroring or what have you, load source disks are the Achilles heel of (older) i platforms.


I've read somewhere (this forum probably) that I'm not supposed to shutdown the system when the load source disk fails.
I've a 9406-800 running V5R4 at home which (I think) doesn't support hot-swapping disks (the cage should have an optional feature for that I think).

Does that mean that, for such a robust platform as OS400/i5OS/IBM i, I'm screwed when that disk fails? Would I need to reinstall from tape? Why bother with offering a RAID option for said machine then in the first place?


Could be that I'm misinterpreting information, but I haven't found a satisfying explanation yet.

If I were to power up my machine (it's at home, so I don't run it 24/7) and experience a broken disk, Is there a possibility to swap the broken disk, IPL the system nonetheless and rebuild the protection from there?


Regards,

Rene.


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