Re: pvs -a on a partition of ZFS block device

Oliver Rath <rath@mglug.de> · Wed, 11 Jun 2014 09:53:28 +0200



    Hi Alex,

      
      Im not sure if I understand right: You take a zfv-Volume to create
      a lvm volume inside? Make it sense to mix two similar concepts in
      this way? Imho zfs and lvm are focussed to different goals, so if
      you combine it, you get the worse of both.

      
      What is your goal mixing these concepts? If you have created a
      zfs-volume, you can mount it directly without detouring over lvm
      and vice versa.

      
      I think it is much better to decide for one of these (zfs-volumes
      XOR lvm-Volumes) depending on your needs. 

      
      Just my 2ct

      
      Regards

      Oliver

      
      Am 10.06.2014 20:44, schrieb alessandro macuz:

    
      Hi all,
        

        the goal is to mount a LVM volume that is contained in a 8e
          partition of a zvol device.
        

        Since we speak about a production system I stated from the
          basic and I wanted to see if pvs would recognize the
          partition. No luck.
        

          root@server02:/mnt# pvs -a /dev/zd1168p2
            Failed to read physical volume "/dev/zd1168p2"
        
        
        but on the other way on the same system I get 
        
          
          root@server02:/mnt# pvs -a /dev/sdb2
            PV         VG         Fmt  Attr PSize   PFree
            /dev/sdb2  vgserver01 lvm2 a-   464.83g 432.82g
        
        
        The only difference I can see between the 2 is the major
          number
        

          root@server02:/mnt# ls -la /dev/zd1168p2
          brw-rw---- 1 root disk 230, 1170 Jun 10 19:56
            /dev/zd1168p2
        
        
        and 
        

          root@server02:/mnt# ls -la /dev/sdb2
          brw-rw---- 1 root disk 8, 18 Feb 11 10:43 /dev/sdb2
        
        
        Is it an expected behaviour that I pvs doesn't recognize
          "physical device" within ZFS block devices?
        

        Thanks, Alex
      
      
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