Shelf removal in hardware ownership

[saranraj456]

Hi Folks.

We have planned to move 2 * 300GB DSMK4 shelves from unused FAS 3050( hardware based ownership) to a new controller . We have destroyed the aggregate and zeroed the disks as spare.

The steps to be followed are

1.CF disable in the old controller  ( since not in use)

2.Halt the controller

3.Power down the shelf manually

4.Unplug it  & plug it new controller

I am so skeptical, the disks should have to come up fine with out tagging of old serial numbers>?

Suggestions please..

Thanks

Saran

[radek_kubka · Accepted solution]

It should work fine - similar procedure to a head swap when doing a controller upgrade: disks / disk shelves can change the 'owner', no issues with that.

[saranraj456]

Thanks radek,

While doing a head swap in software ownership,we need to destroy a mailbox disk, does the same kind of stuff applicable in hardware ownership too...

[aborzenkov]

Yes. Mailbox is not related to software/hardware disk based ownership and should always be cleaned up when head identity changes.

[saranraj456]

Putting up in a wrong thread,still didnt clear with that.

Mailbox destroy was due to mainly because of serial number and what other specific reasons behind that?

[aborzenkov]

Yes, mailbox holds information about current state of disks (e.g. which head is current owner of disks), so it makes sense to clear this information when head identity changes.

[saranraj456]

If it is going to have the serial number of the filer in mind.Why we are not destroying mailbox while replacing a motherboard or NVRAM?

[aborzenkov]

Because in this case filer knows they were replaced. Just try to switch heads off and replace - you will get nasty surprise.