CLVM for CentOS 7



  • i am working on CentOS 7
    and want to configure lvm2-cluster for a shared block device
    when i run the command

    pvcreate /dev/sdb1 
    

    " i have the below error "
    connect() failed on local socket: No such file or directory
    Internal cluster locking initialisation failed.
    WARNING: Falling back to local file-based locking.
    Volume Groups with the clustered attribute will be
    inaccessible.
    Physical volume "/dev/sdb1" successfully created.
    so any advice :)



  • How is the block device being shared? Shouldn't be any different than a normal local drive to the system.


  • Service Provider

    You are sure that you have a /dev/sdb1 device?



  • @travisdh1 said in CLVM for CentOS 7:

    How is the block device being shared? Shouldn't be any different than a normal local drive to the system.

    the block device is shared from iSCSI SAN Storage


  • Service Provider

    @AlyRagab said in CLVM for CentOS 7:

    @travisdh1 said in CLVM for CentOS 7:

    How is the block device being shared? Shouldn't be any different than a normal local drive to the system.

    the block device is shared from iSCSI SAN Storage

    And the iSCSI device has /dev/sdb? Are you sure? Just double check that.



  • @scottalanmiller said in CLVM for CentOS 7:

    You are sure that you have a /dev/sdb1 device?

    yes , since i have one disk in this server " /dev/sda " and after iscsiadm login to the shared lun from iSCSI Target i can see /dev/sdb


  • Service Provider

    Any reason that you are using sdb1 not sdb?



  • @scottalanmiller i want to configure cluster between 3 nodes running with CentOS7 using pacemaker and shared storage ,
    i have created the shared LUN on the storage and i can access it through all nodes,
    i have configured the nodes with the basic configuration of the pacemaker and pcs status command shows me that everything is very good
    all nodes are online and there is no any error ,

    in one node from them i have created a partition "sdb1" so that i can create a GFS2 file system to that and then complete the cluster resource setup on it but have faced this error



  • @scottalanmiller said in CLVM for CentOS 7:

    @AlyRagab said in CLVM for CentOS 7:

    @travisdh1 said in CLVM for CentOS 7:

    How is the block device being shared? Shouldn't be any different than a normal local drive to the system.

    the block device is shared from iSCSI SAN Storage

    And the iSCSI device has /dev/sdb? Are you sure? Just double check that.

    yes it has


  • Service Provider

    @AlyRagab said in CLVM for CentOS 7:

    @scottalanmiller i want to configure cluster between 3 nodes running with CentOS7 using pacemaker and shared storage ,
    i have created the shared LUN on the storage and i can access it through all nodes,
    i have configured the nodes with the basic configuration of the pacemaker and pcs status command shows me that everything is very good
    all nodes are online and there is no any error ,

    in one node from them i have created a partition "sdb1" so that i can create a GFS2 file system to that and then complete the cluster resource setup on it but have faced this error

    Why a partition when you are using LVM?



  • @scottalanmiller sorry , i mean i want to create the volume group based on this pyhiscal partition using the CLVM but i can not at this moment to do that



  • @AlyRagab said in CLVM for CentOS 7:

    @scottalanmiller sorry , i mean i want to create the volume group based on this pyhiscal partition using the CLVM but i can not at this moment to do that

    What does pvdisplay currently list?



  • @travisdh1 said in CLVM for CentOS 7:

    @AlyRagab said in CLVM for CentOS 7:

    @scottalanmiller sorry , i mean i want to create the volume group based on this pyhiscal partition using the CLVM but i can not at this moment to do that

    What does pvdisplay currently list?

    here is the output of the pvs command

    [[email protected] ~]# pvs
    connect() failed on local socket: No such file or directory
    Internal cluster locking initialisation failed.
    WARNING: Falling back to local file-based locking.
    Volume Groups with the clustered attribute will be inaccessible.
    PV VG Fmt Attr PSize PFree
    /dev/sda2 centos lvm2 a-- 29.51g 44.00m
    /dev/sdb1 lvm2 --- 60.00g 60.00g



  • pvdisplay command output too

    [[email protected] ~]# pvdisplay
    connect() failed on local socket: No such file or directory
    Internal cluster locking initialisation failed.
    WARNING: Falling back to local file-based locking.
    Volume Groups with the clustered attribute will be inaccessible.
    --- Physical volume ---
    PV Name /dev/sda2
    VG Name centos
    PV Size 29.51 GiB / not usable 3.00 MiB
    Allocatable yes
    PE Size 4.00 MiB
    Total PE 7554
    Free PE 11
    Allocated PE 7543
    PV UUID kI6RJ1-ZfLZ-vSNW-teO3-dheF-aK8j-OKSole

    "/dev/sdb1" is a new physical volume of "60.00 GiB"
    --- NEW Physical volume ---
    PV Name /dev/sdb1
    VG Name
    PV Size 60.00 GiB
    Allocatable NO
    PE Size 0
    Total PE 0
    Free PE 0
    Allocated PE 0
    PV UUID P1CkZw-jq49-a6T6-mwO5-EQtz-y4dX-BYcUWq



  • @AlyRagab That's looking like something is wrong with the iSCSI mount.



  • @travisdh1 said in CLVM for CentOS 7:

    @AlyRagab That's looking like something is wrong with the iSCSI mount.

    i am using the below commands to access the storage :
    the IP Address of the Target is : 192.168.1.40

    iscsiadm -m discovery -t sendtargets -p 192.168.1.40
    iscsiadm -m node -T iqn.2017-05.local.server:target -p 192.168.1.40:3260 --login


  • @AlyRagab and from the storage side :

    # targetcli sessions
    alias: node1.server.local       sid: 4 type: Normal session-state: LOGGED_IN
    alias: node2.server.local       sid: 5 type: Normal session-state: LOGGED_IN
    alias: node3.server.local       sid: 2 type: Normal session-state: LOGGED_IN

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