18.7. Displaying Volume Status

You can display the status information about a specific volume, brick, or all volumes, as needed. Status information can be used to understand the current status of the brick, NFS processes, self-heal daemon and overall file system. Status information can also be used to monitor and debug the volume information. You can view status of the volume along with the details:
  • detail - Displays additional information about the bricks.
  • clients - Displays the list of clients connected to the volume.
  • mem - Displays the memory usage and memory pool details of the bricks.
  • inode - Displays the inode tables of the volume.
  • fd - Displays the open file descriptor tables of the volume.
  • callpool - Displays the pending calls of the volume.
Display information about a specific volume using the following command:
# gluster volume status [all|VOLNAME [nfs | shd | BRICKNAME]] [detail |clients | mem | inode | fd |callpool]
For example, to display information about test-volume:
# gluster volume status test-volume
Status of volume: test-volume
Gluster process                        Port    Online   Pid
------------------------------------------------------------
Brick arch:/export/rep1                24010   Y       18474
Brick arch:/export/rep2                24011   Y       18479
NFS Server on localhost                38467   Y       18486
Self-heal Daemon on localhost          N/A     Y       18491
The self-heal daemon status will be displayed only for replicated volumes.
Display information about all volumes using the command:
# gluster volume status all
# gluster volume status all
Status of volume: test
Gluster process                       Port    Online   Pid
-----------------------------------------------------------
Brick 192.168.56.1:/export/test       24009   Y       29197
NFS Server on localhost               38467   Y       18486

Status of volume: test-volume
Gluster process                       Port    Online   Pid
------------------------------------------------------------
Brick arch:/export/rep1               24010   Y       18474
Brick arch:/export/rep2               24011   Y       18479
NFS Server on localhost               38467   Y       18486
Self-heal Daemon on localhost         N/A     Y       18491
Display additional information about the bricks using the command:
# gluster volume status VOLNAME detail
For example, to display additional information about the bricks of test-volume:
# gluster volume status test-volume detail
Status of volume: test-vol
------------------------------------------------------------------------------
Brick                : Brick arch:/exp     
Port                 : 24012               
Online               : Y                   
Pid                  : 18649               
File System          : ext4                
Device               : /dev/sda1           
Mount Options        : rw,relatime,user_xattr,acl,commit=600,barrier=1,data=ordered
Inode Size           : 256                 
Disk Space Free      : 22.1GB              
Total Disk Space     : 46.5GB              
Inode Count          : 3055616             
Free Inodes          : 2577164
Detailed information is not available for NFS and the self-heal daemon.
Display the list of clients accessing the volumes using the command:
# gluster volume status VOLNAME clients
For example, to display the list of clients connected to test-volume:
# gluster volume status test-volume clients
Brick : arch:/export/1
Clients connected : 2
Hostname          Bytes Read   BytesWritten
--------          ---------    ------------
127.0.0.1:1013    776          676
127.0.0.1:1012    50440        51200
Client information is not available for the self-heal daemon.
Display the memory usage and memory pool details of the bricks on a volume using the command:
# gluster volume status VOLNAME mem
For example, to display the memory usage and memory pool details for the bricks on test-volume:
# gluster volume status test-volume mem
Memory status for volume : test-volume
----------------------------------------------
Brick : arch:/export/1
Mallinfo
--------
Arena    : 434176
Ordblks  : 2
Smblks   : 0
Hblks    : 12
Hblkhd   : 40861696
Usmblks  : 0
Fsmblks  : 0
Uordblks : 332416
Fordblks : 101760
Keepcost : 100400

Mempool Stats
-------------
Name                               HotCount ColdCount PaddedSizeof AllocCount MaxAlloc
----                               -------- --------- ------------ ---------- --------
test-volume-server:fd_t                0     16384           92         57        5
test-volume-server:dentry_t           59       965           84         59       59
test-volume-server:inode_t            60       964          148         60       60
test-volume-server:rpcsvc_request_t    0       525         6372        351        2
glusterfs:struct saved_frame           0      4096          124          2        2
glusterfs:struct rpc_req               0      4096         2236          2        2
glusterfs:rpcsvc_request_t             1       524         6372          2        1
glusterfs:call_stub_t                  0      1024         1220        288        1
glusterfs:call_stack_t                 0      8192         2084        290        2
glusterfs:call_frame_t                 0     16384          172       1728        6
Display the inode tables of the volume using the command:
# gluster volume status VOLNAME inode
For example, to display the inode tables of test-volume:
# gluster volume status test-volume inode
inode tables for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Active inodes:
GFID                                            Lookups            Ref   IA type
----                                            -------            ---   -------
6f3fe173-e07a-4209-abb6-484091d75499                  1              9         2
370d35d7-657e-44dc-bac4-d6dd800ec3d3                  1              1         2

LRU inodes: 
GFID                                            Lookups            Ref   IA type
----                                            -------            ---   -------
80f98abe-cdcf-4c1d-b917-ae564cf55763                  1              0         1
3a58973d-d549-4ea6-9977-9aa218f233de                  1              0         1
2ce0197d-87a9-451b-9094-9baa38121155                  1              0         2
Display the open file descriptor tables of the volume using the command:
# gluster volume status VOLNAME fd
For example, to display the open file descriptor tables of test-volume:
# gluster volume status test-volume fd

FD tables for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Connection 1:
RefCount = 0  MaxFDs = 128  FirstFree = 4
FD Entry            PID                 RefCount            Flags              
--------            ---                 --------            -----              
0                   26311               1                   2                  
1                   26310               3                   2                  
2                   26310               1                   2                  
3                   26311               3                   2                  
 
Connection 2:
RefCount = 0  MaxFDs = 128  FirstFree = 0
No open fds
 
Connection 3:
RefCount = 0  MaxFDs = 128  FirstFree = 0
No open fds
FD information is not available for NFS and the self-heal daemon.
Display the pending calls of the volume using the command:
# gluster volume status VOLNAME callpool
Note, each call has a call stack containing call frames.
For example, to display the pending calls of test-volume:
# gluster volume status test-volume callpool

Pending calls for volume test-volume
----------------------------------------------
Brick : arch:/export/1
Pending calls: 2
Call Stack1
 UID    : 0
 GID    : 0
 PID    : 26338
 Unique : 192138
 Frames : 7
 Frame 1
  Ref Count   = 1
  Translator  = test-volume-server
  Completed   = No
 Frame 2
  Ref Count   = 0
  Translator  = test-volume-posix
  Completed   = No
  Parent      = test-volume-access-control
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)->fops->fsync
 Frame 3
  Ref Count   = 1
  Translator  = test-volume-access-control
  Completed   = No
  Parent      = repl-locks
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)->fops->fsync
 Frame 4
  Ref Count   = 1
  Translator  = test-volume-locks
  Completed   = No
  Parent      = test-volume-io-threads
  Wind From   = iot_fsync_wrapper
  Wind To     = FIRST_CHILD (this)->fops->fsync
 Frame 5
  Ref Count   = 1
  Translator  = test-volume-io-threads
  Completed   = No
  Parent      = test-volume-marker
  Wind From   = default_fsync
  Wind To     = FIRST_CHILD(this)->fops->fsync
 Frame 6
  Ref Count   = 1
  Translator  = test-volume-marker
  Completed   = No
  Parent      = /export/1
  Wind From   = io_stats_fsync
  Wind To     = FIRST_CHILD(this)->fops->fsync
 Frame 7
  Ref Count   = 1
  Translator  = /export/1
  Completed   = No
  Parent      = test-volume-server
  Wind From   = server_fsync_resume
  Wind To     = bound_xl->fops->fsync