Correcting EVA6000 Enclosure Address Bus (EAB) Cabling

[swazilee]

Hi,

I have inherited an EVA 6000 that was upgraded from a 2C4D to a 2C8D and ID Port 5 and 7 were used for the new drive enclosures when the Enclosure Address Bus (EAB) Cabling was done. ID Port 9 was used for the controllers. It seems to be working but I understand that this is incorrect and an unsupported config. I have some maintenance to do on the system soon and was wondering what impact changing the EAB cabling to the correct config would have on my data? Would I lose data because the Drive Enclosures would be on a different port after the change?

Thanks

Lee.

[Sebastian.Koehler · Accepted solution]

Don't worry. I had to do this one or two times. Just shutdown the array and turn of the shelfs as well. Correct the cables, turn on the shelfs and verify EAB addresses first. Turn on the controllers if the addresses are as expected. The system will find all the drives, metadata and start the system without any issues. Are you aware of the IDs that should be used?

Regards,
Sebastian

[swazilee]

Thanks for the reply Sebastian.

As i understand it, ID 5 and 7 should not be used, they supposed to be for the controllers. So in my case the first 4 enclosures will keep there ID's, the top 4 will change there ID's.

And hopefully restores wont be required. ;-)

Thanks again.

Regards

Lee.

[Sebastian.Koehler]

I've attached a picture for your reference. Use ID 5 for the controllers and do not use ID 7.

Regards,

Sebastian

[swazilee]

Very helpful.
Thanks.

[swazilee]

By the way, any idea what terrible things are supposed to happen if you use ID 5 and 7. This EVA had enclosures on 5 and 7 and seemed to be running ok?

[Sebastian.Koehler]

Based on the ID of an enclosure AL_PAs are assigned to devices. This is true for the controllers and drives. ID 7 causes the highest available AL_PAs to be assigned to the attached devices. To ensure the controller is able to remove misbehaving drives from the loop, they need to have the highest AL_PA on the backend loop. As long there is no faulty drive in the EVA, you will not see any negative effect.

Regards,
Sebastian

[swazilee]

Thanks for your time.

[Sebastian.Koehler]

You're welcome. Don't forget to assign a kudo or two. :)