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Administrator Guide

OceanStor 2800 V5 V500R007

This document is applicable to OceanStor 2800 V5. Routine maintenance activities are the most common activities for the storage device, including powering on or off the storage device, managing users, modifying basic parameters of the storage device, and managing hardware components. This document is intended for the system administrators who are responsible for carrying out routine maintenance activities, monitoring the storage device, and rectifying common device faults.
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Reclaiming Space of a Storage System (Linux)

Reclaiming Space of a Storage System (Linux)

This section describes how to reclaim space and then use it for new services if all or some services of a storage system are not required anymore, or some expanded space is unnecessary in a Linux operating system, thereby enhancing storage space utilization.

Preparing for Space Reclamation (Linux)

Before reclaiming space, you must finish preparatory work such as backing up disk information and checking the host's and storage device's running status to ensure that the space reclamation can be successfully implemented.

Procedure
  1. Confirm the range of to-be-reclaimed storage space and back up disk information.

    1. Confirm whether it is full reclamation or partial reclamation.
    2. Run vgdisplay -v, pvdisplay, and fdisk -l to view VG, PV, and disk information. Back up the information.
    3. Make sure that the to-be-reclaimed disk will not be used anymore.
      1. Run upadmin show vlun to view the mappings between the to-be-reclaimed LUN and the disk on the host.
      2. Run vgdisplay -v and make sure that the to-be-reclaimed disk is not in a VG.

  2. Check the host running status.

    1. Run more /var/log/messages to check whether there are any errors related to the storage system on the host. If there are, remove the errors and proceed to the next step.
    2. Check the disk path status.
      1. Run upadmin show vlun to query the status of all vLUNs. Confirm that the status of all vLUNs is Normal.
      2. Run upadmin show path and make sure that the system path status is Normal. If a path whose status is Degrade exists, run upadmin set phypathnormal. Specify the path whose status is Degrade using the path_id parameter.
    3. Run upadmin set workingmode=0 to change the working mode of UltraPath.
    4. Run upadmin set loadbalancemode=round-robin to change the I/O pathing mode of UltraPath.

  3. Check the storage system status. If there are alarms, clear them and then proceed to the next step.
  4. On the storage system, export the storage system configuration data.

    1. Log in to the CLI of the storage system using PuTTY.
      NOTE:

      The default user name and password are respectively admin and Admin@storage.

    2. Run export running_data to export and save the current configuration file.

  5. Check the status of the connection between the host HBA and the storage device.

    1. As planned, check whether the two devices (the HBA and the storage device) are connected and whether the zoning on the switch is correct by using the WWN of the host HBA and the front-end port of the storage device.
    2. Run show port general to check whether the planned front-end network is connected. Specify the front-end port using the port_id parameter.

      If the planned front-end network is connected, its Type is Host Port and its Running Status is Link up.

    3. Run show initiator initiator_type=FC isfree=yes to check whether the storage device can query the initiator on the host and filter out initiators that are not assigned to the host.

      In the command output, the planned HBA should exist and its running status should be Online.

        
      admin:/>show initiator initiator_type=FC isfree=yes 
      WWN                 Running Status        Free        
      ----------------- ------------------- -----       
      100000000000*       Online                Yes        
      Alias      Host ID         Multipath Type 
      -------    ----------      ------------------ 
      --         --              Default

Reclaiming Space (Linux)

This section describes how to reclaim the space used by a Linux host using full reclamation or partial reclamation.

Full Reclamation
  1. Reclaim the WWN.

    1. Run show mapping_view general to obtain the host group ID in the mapping view to be reclaimed. Specify the mapping view using the mapping_view_id parameter.
    2. Obtain the information about hosts and initiators in the to-be-reclaimed host group.
      1. Run show host_group host to show the host that has been added to the to-be-reclaimed host group. Specify the ID of the to-be-reclaimed host group using the mapping_view_id parameter.
      2. Run show initiator to view the WWN about the host HBA that has been added to the to-be-reclaimed host group. Specify the ID of the host in the to-be-reclaimed host group using the host_id parameter.
    3. Run remove host initiator initiator_type=FC to remove the WWN. Specify the to-be-reclaimed WWN using the wwn parameter.
    4. Run show initiator isfree=yes initiator_type=FC to check whether the WWN is successfully deleted.

      If the deleted WWN exists in the command output, the deletion is successful.

       
      admin:/>show initiator isfree=yes initiator_type=FC 
      WWN                 Running Status        Free       
      ----------------- ------------------- -----      
      100000000000*       Online                Yes        
      Alias      Host ID         Multipath Type 
      -------    ----------      ------------------ 
      --         --              Default
    5. In DeviceManager, view the port information about the host.

  2. Run upadmin show path to check the path status of the system. The reclaimed path should not exist in the command output.

    NOTE:

    Wait at least 15 minutes and confirm that no errors exist on disks of other hosts. Then proceed to the next step.

  3. Delete a mapping view.

    1. Run show mapping_view general to obtain the IDs of the LUN group and host group in the mapping view to be reclaimed. Specify the mapping view using the mapping_view_id parameter.
    2. Run remove mapping_view lun_group to delete the LUN group mapped to the mapping view. Specify the to-be-claimed mapping view and the to-be-claimed LUN group using the mapping_view_id and lun_group_id parameters.
    3. Run remove mapping_view port_group to delete the port group in the mapping view. Specify the to-be-claimed mapping view and the to-be-claimed port group using the mapping_view_id and port_group_id parameters.
    4. Run remove mapping_view host_group to delete the host group in the mapping view. Specify the to-be-claimed mapping view and the to-be-claimed host group using the mapping_view_id and host_group_id parameters.
    5. Run delete mapping_view to delete a mapping view. Specify the to-be-reclaimed mapping view using the mapping_view_id parameter.
    6. Run show mapping_view general to check whether that mapping view has been deleted.

      The deleted mapping view should not exist in the command output.

    7. In DeviceManager, view all mapping views. The deleted mapping view should not exist.

  4. Delete a LUN Group

    1. Run remove lun_group lun to remove all LUNs in the LUN group. Specify the to-be-reclaimed LUN group and the to-be-removed LUN using the lun_group_id and lun_id_list parameters.
    2. Run delete lun_group to delete a LUN group. Specify the to-be-reclaimed LUN group using the lun_group_id parameter.

  5. Delete a port group.

    1. Run remove port_group port to remove all ports in the port group. Specify the to-be-reclaimed port group and to-be-removed ports using the port_group_id and port_id_list parameters.
    2. Run delete port_group to delete a port group. Specify the to-be-reclaimed port group using the port_group_id parameter.

  6. Delete a host group.

    1. Run remove host_group host to remove all hosts in the host group. Specify the to-be-reclaimed host group and to-be-removed hosts using the host_group_id and host_id_list parameters.
    2. Run delete host_group to delete a host group. Specify the to-be-reclaimed host group using the host_group_id parameter.
    3. Run remove host initiator initiator_type=FC to remove all initiators of the to-be-reclaimed host. Specify the to-be-removed initiator using the wwn parameter.
    4. Run delete host to delete a to-be-reclaimed host. Specify the to-be-reclaimed host using the host_id parameter.

  7. Scan for disks on the host.

    1. Run upRescan to scan for disks.
       #upRescan 
          Begin to delete LUNs whose mappings do not exist 
          Begin to delete LUNs whose mappings are changed
    2. Run upadmin show vlun to check whether the number of disks managed by UltraPath is the same as planned.
    3. Run upadmin show path to check whether the disk path status is normal. If the status of a path is Degrade, run upadmin set phypathnormal to set the path to Normal. In the command, set path_id to the ID of the Degrade path.

  8. Uninstall UltraPath.

    1. Run rpm -e UltraPath to uninstall UltraPath.
    2. Run rpm -qa | grep UltraPath to check whether the uninstallation is successful. If information about UltraPath does not exist in the command output, the uninstallation is successful.

  9. Run shutdown -r now to restart the host.
  10. Verify the storage environment on the host.

    1. Run fdisk -l to check the host. In the command output, to-be-reclaimed disks should not exist.
    2. Run more /var/log/messages to check whether there are any errors related to the storage system on the host. If there are, collect relevant information and remove the errors.

  11. On the switch, delete zone or VLAN configurations.
Partial Reclamation
  1. Remove the to-be-reclaimed LUN from the owning LUN group.

    1. Run show mapping_view general to obtain the details about the to-be-reclaimed mapping view. Specify the mapping view using the mapping_view_id parameter.
    2. Run remove lun_group lun to remove the to-be-reclaimed LUN from the LUN group. Specify the LUN group and to-be-reclaimed LUN using the lun_group_id and lun_id_list parameters.
    3. Run show lun_group lun to check whether the to-be-reclaimed LUN has been removed from the LUN group. Specify the LUN group where the to-be-claimed LUN resides using the lun_group_id parameter.

      The deleted LUN should not exist in the command output.

      admin:/>show lun_group lun lun_group_id=LGID 
      ID     Name           Pool ID    Capacity 
      ---- -------------  -------- -------- 
      1      LUN1           0          1.000TB  
      Helth Status      Running Status      Type       
      --------------- ------------------- -------    
      Normal            Online              Thick      
      WWN 
      --------------------------------- 
      60022a11000******************

  2. Scan for disks on the host.

    1. Run upRescan to scan for disks.
       #upRescan 
          Begin to delete LUNs whose mappings do not exist 
          Begin to delete LUNs whose mappings are changed
    2. Run upadmin show vlun to check whether the number of disks managed by UltraPath is the same as planned.
    3. Run upadmin show path to check whether the disk path status is normal. If the status of a path is Degrade, run upadmin set phypathnormal to set the path to Normal. In the command, set path_id to the ID of the Degrade path.

  3. Verify the storage environment on the host.
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Updated: 2019-07-11

Document ID: EDOC1000181576

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