how to import a detached volume with status UNAVAIL

[ashokmedia]

I had a raidz 2by2 configuration,My zpool status changed to UNAVAIL. When i examined my hardware one of my hard disk is failure. After i replaced my hard disk with new one the status remained UNAVAIL. I detached the volume from gui. When I tried to import using shell command zpool import its showing error message "one or more device missing ...". Anyone please help me to repair and import my zpool.

 

[garm]

raidz 2by2?
provide the printout of zpool import.

 

[ashokmedia]

thanks for your reply

Code:

[root@freenas ~]# zpool import                                                                                                     
   pool: segate2by2                                                                                                                 
     id: 7849192800514392078                                                                                                       
  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://illumos.org/msg/ZFS-8000-6X                                                                                         
 config:                                                                                                                           
                                                                                                                                    
        segate2by2                                    UNAVAIL  missing device                                                       
          gptid/44dbc0c3-bc42-11e8-b444-001b21240432  ONLINE                                                                       
          gptid/e2344073-ea0f-11e5-b4ad-001b21240432  ONLINE                                                                       
          gptid/e2d70637-ea0f-11e5-b4ad-001b21240432  ONLINE                                                                       
                                                                                                                                    
        Additional devices are known to be part of this pool, though their                                                         
        exact configuration cannot be determined.       

 

[danb35]

I had a raidz 2by2 configuration

There's no such thing (the closest thing I can think of to that terminology would have traditionally been called RAID 10, and with ZFS is called striped mirrors, but that wouldn't be any flavor of RAIDZ, and also isn't what you had). What you appear to have had was four disks striped, with one of the disks now missing or dead. Unless you can revive that disk for at least a while, your data is gone.

 

[ashokmedia]

There's no such thing (the closest thing I can think of to that terminology would have traditionally been called RAID 10, and with ZFS is called striped mirrors, but that wouldn't be any flavor of RAIDZ, and also isn't what you had). What you appear to have had was four disks striped, with one of the disks now missing or dead. Unless you can revive that disk for at least a while, your data is gone.

 

[danb35]

What you show there is striped mirrors. It isn't what your pool was.

 

[ashokmedia]

Thanks danb35. Hope the above screenshot will help you to understand.

 

[ashokmedia]

yes this is how i created to remember that i named it as segate2by2

 

[danb35]

yes this is how i created

The output of zpool import indicates that you're mistaken. That output indicates that you had three disks (which are available to the system) striped with at least one more (and from the rest of your post, almost certainly exactly one more). You had no redundancy in that configuration, so with the loss of one disk all the data in your pool is lost. The only way to get any of your data back is to bring that disk back online, or to restore from backup.

 

[garm]

To get mirrors you needed to select “mirror” in the creation dialogue drop down. You show “stripe” and thus you will create a striped pool, regardless of how many rows of disks you have.

 

[ashokmedia]

The output of zpool import indicates that you're mistaken. That output indicates that you had three disks (which are available to the system) striped with at least one more (and from the rest of your post, almost certainly exactly one more). You had no redundancy in that configuration, so with the loss of one disk all the data in your pool is lost. The only way to get any of your data back is to bring that disk back online, or to restore from backup.

I already resilvered a disk a year before.So im sure that failure of a disk will not destroy my array.

 

[ashokmedia]

Is it possible to change the status of my zpool to degrade and resilver it with a new disk?

 

[sretalla]

I already resilvered a disk a year before.So im sure that failure of a disk will not destroy my array.

Based on what you have shown us, that can't be true... are you sure you resilvered and didn't just add a disk to the pool?

 

[garm]

You can resilver a drive in a stripe as long as you don’t have checksum errors, but if you have an unavailable drive and you can’t revive it you lose the pool

 

[ashokmedia]

Based on what you have shown us, that can't be true... are you sure you resilvered and didn't just add a disk to the pool?

I dont understand main system?. Is there any command to do show

 

[sretalla]

As @garm pointed out, perhaps you did resilver by temporarily adding a disk, resilvering a working disk to it (which must work during the process), then removing the working original disk.

Zpool status (which is shown for an unimported pool with zpool import anyway) shows us that you don't have a redundant pool setup, so with a missing disk, you have no options to recover other than your backup (if you have one).

 

[HoneyBadger]

Grab the output of zpool history in one text file, the output of zdb -U /data/zfs/zpool.cache in another, and attach the two text files to a post here.

This will definitively tell you the past and present states of your pool.

 

[ashokmedia]

Grab the output of zpool history in one text file, the output of zdb -U /data/zfs/zpool.cache in another, and attach the two text files to a post here.

This will definitively tell you the past and present states of your pool.

sory for the delay

 

[HoneyBadger]

sory for the delay

Your zpool history is only showing the freenas-boot pool ... although since the other one is in an exported state that's probably to be expected.

But looking at the zdb output we can see that your pool was indeed created with four striped vdevs. All four disks are directly from the root.

 

[ashokmedia]

Your zpool history is only showing the freenas-boot pool ... although since the other one is in an exported state that's probably to be expected.

But looking at the zdb output we can see that your pool was indeed created with four striped vdevs. All four disks are directly from the root.

It's showing only boot because I detached segate2by2 volume. I had only that volume.