Re: how to restore snapshot LV's

Mohammed Rafi K C <rkavunga@xxxxxxxxxx> · Fri, 19 May 2017 12:04:21 +0530



    I do not know how you ended up in this state. This usually
      happens when there is a commit failure. To recover from this state
      you can change the value of "status" from
    the path
      /var/lib/glusterd/snaps/<snapname>/<snapuid>/info .
      From this file change the status to 0 in nodes where the values
      are one. Then restart glusterd on those node where we changed
      manually.
    Then try to activate it.
    

    Regards
    Rafi KC

    
    On 05/18/2017 09:38 AM, Pranith Kumar
      Karampuri wrote:

    
      +Rafi, +Raghavendra Bhat

      
        On Tue, May 16, 2017 at 11:55 AM,
          WoongHee Han <polishedwh@xxxxxxxxx>
          wrote:

          
            Hi, all!
              

                I erased the VG having snapshot LV related to
                  gluster volumes
                and then, I tried to restore volume;
              
              
              1. vgcreate vg_cluster /dev/sdb
              2. lvcreate --size=10G --type=thin-pool -n tp_cluster
                vg_cluster
              3. lvcreate -V 5G --thinpool vg_cluster/tp_cluster -n
                test_vol vg_cluster
              4. gluster v stop test_vol
              5. getfattr -n trusted.glusterfs.volume-id
                /volume/test_vol ( in other node)

              
              6. setfattr -n trusted.glusterfs.volume-id -v
                 0sKtUJWIIpTeKWZx+S5PyXtQ== /volume/test_vol
                (already mounted)
              7. gluster v start test_vol
              8. restart glusterd
              9. lvcreate -s vg_cluster/test_vol
                --setactivationskip=n --name 6564c50651484d09a36b912962c573df_0
              10. lvcreate -s vg_cluster/test_vol
                --setactivationskip=n --name ee8c32a1941e4aba91feab21fbcb3c6c_0

              
              11. lvcreate -s vg_cluster/test_vol
                --setactivationskip=n --name bf93dc34233646128f0c5f84c3ac1f83_0 

              
              12. reboot
              

              It works, but bricks for snapshot is not working.
              

              ------------------------------------------------------------------------------------------------------------------------------------------
              ~]# glsuter snpshot status
              
                	Brick
                  Path        :   192.225.3.35:/var/run/gluster/snaps/bf93dc34233646128f0c5f84c3ac1f83/brick1
                	Volume
                  Group      :   vg_cluster
                	Brick
                  Running     :   No
                	Brick
                  PID         :   N/A
                	Data
                  Percentage   :   0.22
                	LV
                  Size           :   5.00g
                

                	Brick
                  Path        :   192.225.3.36:/var/run/gluster/snaps/bf93dc34233646128f0c5f84c3ac1f83/brick2
                	Volume
                  Group      :   vg_cluster
                	Brick
                  Running     :   No
                	Brick
                  PID         :   N/A
                	Data
                  Percentage   :   0.22
                	LV
                  Size           :   5.00g
                

                	Brick
                  Path        :   192.225.3.37:/var/run/gluster/snaps/bf93dc34233646128f0c5f84c3ac1f83/brick3
                	Volume
                  Group      :   vg_cluster
                	Brick
                  Running     :   No
                	Brick
                  PID         :   N/A
                	Data
                  Percentage   :   0.22
                	LV
                  Size           :   5.00g
                

                	Brick
                  Path        :   192.225.3.38:/var/run/gluster/snaps/bf93dc34233646128f0c5f84c3ac1f83/brick4
                	Volume
                  Group      :   vg_cluster
                	Brick
                  Running     :   Tes
                	Brick
                  PID         :   N/A
                	Data
                  Percentage   :   0.22
                	LV
                  Size           :   5.00g
                
                  
                  ~]# gluster snapshot deactivate
                    t3_GMT-2017.05.15-08.01.37
                  Deactivating snap will make its data
                    inaccessible. Do you want to continue? (y/n) y
                  snapshot deactivate: failed: Pre Validation
                    failed on 192.225.3.36. Snapshot
                    t3_GMT-2017.05.15-08.01.37 is already deactivated.
                  Snapshot command failed
                
                
                ~]# gluster snapshot activate
                  t3_GMT-2017.05.15-08.01.37
                snapshot activate: failed: Snapshot
                  t3_GMT-2017.05.15-08.01.37 is already activated
              
              
              ------------------------------------------------------------------------------------------------------------------------------------------

              
              how to  restore snapshot LV's ?
              

              my nodes consist of four nodes and  distributed,
                replicated (2x2)
              

              thank you.
              

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        -- 

        
          Pranith

          
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