Bobby Petrov

12 Posts

9973

August 4th, 2016 03:00

Data Domain DD880 - Disk showing "Available" ( V ) instead of "Spare" ( S ) after faulty disk replacement

Hi all,

I hope someone can help on that issue.

After a failed disk replacement the new disk comes as Available state instead of Spare state.

Here is an output of the Disk Show State command:

Enclosure Disk

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

--------- ------------------------------------------------

1 s . . .

2 . . . . . . . . s . . . . . s .

3 . . . . . . . . . . . . . . s s

4 . . . . . . . . . . . . . . s s

5 . . . . . . . . . . . . . . s

6 . . . . . . . . . s . . . . . s

7 . . v . . . . . . . . . . . s .

8 . . . . . . . . . . . . . . s s

9 . . . . . . . s . . . . . . .

10 . . . . . . . . . . . . . . s

11 . . . . . . . . . . . . . . s s

12 . . . . . . s . . . . . . . .

13 . . . s . . . . . . . . . . s .

--------- ------------------------------------------------

Legend State Count

------ --------------- -----

. In Use Disks 171

s Spare Disks 20

v Available Disks 1

Total 192 disks

Thanks for your time.

Responses(3)

richbinstead

62 Posts

0

August 5th, 2016 05:00

Hi Bobby.P,

When you replace a failed disk and the new disk is inserted, the DataDomain system will:

- Examine the newly inserted disk for any partitions that exist.

- If there are no partitions on the disk, then a number of partitions will be created. In one partition, specifically partition 3, will we create a DataDomain superblock. This disk will then become a spare disk as indicated by the 's' state above.

- If partition 3 exists, it is checked for the presence of a superblock. If a superblock exists and the superblock shows the information from another system, the disk will become a foreign or unknown.

- If partition 3 exists but there is no superblock, the disk will become a 'v' available disk.

So the disk you inserted seems to have had partition 3 already created.

The other disk you inserted that immediately became a spare indicates it had no partitions installed upon it.

Therefore as srishenoy mentioned, a disk fail followed by a disk unfail should resolve the 'v' issue and force DataDomain to recreate the partitions and superblock information.

I hope this helps explain why.

cheers, Rich.

Bobby Petrov

12 Posts

0

August 4th, 2016 07:00

Hi Srishenoy,

We did not perform that command.

However we noticed that the faulty drive was with part number 0955287-02 and the replacement drive we used was p/n: 0955287-01.

Could that be the reason the system did not recognized it as a Spare, and would the fail -> unfail command sort it out.

P.S. Worth mentioning is that we now have replaced it with the identical part number (0955287-02) and the disk came up as Spare disk.

Bobby Petrov

12 Posts

0

August 5th, 2016 05:00

Hi Rich,

Will give it a try on the next failed drive and will update you how it went.

Cheers,

Bobby

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