Dear ZFS developers,

We are a scientific research center in Berlin, and we are using ZFS as file 
system for our servers.

We need an urgent help in this issue:

We have one DELL machine (CentOS 6) was running as File server:

1- It has 2 rear drives with RAID mirror, where the OS was installed.
2- It has 16 front drives (SEAGATE) 6TB.
3- It is attached to external DISK enclosure with 30 external drives * 6TB
4- It has a zpool (data18) contains 16 (front disks) + 30 (external disks).

We reinstall a new OS (CentOS 7.4) on the rear drives but we found that the GPT 
partition table was lost for 30 external drives, then the zpool failed to 
import the dataset again

$ zpool import
   pool: data18
     id: 18087394550162618068
  state: UNAVAIL
 status: One or more devices are missing from the system.
 action: The pool cannot be imported. Attach the missing
    devices and try again.
   see: http://zfsonlinux.org/msg/ZFS-8000-6X
 config:

    data18        UNAVAIL  missing device
      raidz3-0    ONLINE
        mpathae1  ONLINE
        mpathaf1  ONLINE
        mpatham1  ONLINE
        mpathan1  ONLINE
        mpathao1  ONLINE
        mpathap1  ONLINE
        mpathaq1  ONLINE
        mpathar1  ONLINE
        mpathas1  ONLINE
        mpathat1  ONLINE
        mpathag1  ONLINE
        mpathah1  ONLINE
        mpathai1  ONLINE
        mpathaj1  ONLINE
        mpathak1  ONLINE
    spares
      sdp

    Additional devices are known to be part of this pool, though their
    exact configuration cannot be determined.

Could you please advise us?!

We appreciate any advice or help from you.

Thanks in advance,
Best regards,
--------------------------------
Motaz Diab
HPC System Administrator
Max-Delbrück-Center
Robert Rössle Str. 10
13125 Berlin
House 23 / Room 202
Tel:+49-(0)30-9406 2586

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