Section: Maintenance Commands (8)
Updated: November 2018


cvadmin – Administer a StorNext File System


cvadmin [-H FSMHostName] [-F FileSystemName] [-M] [-n] [-x] [-f filename] [-e command1 -e command2…]


cvadmin is an interactive command used for general purposeadministration of a StorNext File System including:

1. displaying file system and client status

2. activating a file system currently in stand-by mode

3. viewing stripe group attributes

4. enabling File System Manager (FSM) tracing

5. displaying disk and path information for the local system

6. forcing FSM failover

7. fetching FSM usage and performance statistics

8. temporarily enabling or disabling global file locking

9. generating a report of open files

10. listing currently held file locks

11. starting, restarting and stopping of daemon processes

12. resetting RPL information


Invoke cvadmin to start the interactive session and list the running File System Managers (FSMs). (Note: StorNext system services must be started prior to running cvadmin. In particular, the local fsmpm(8) process must be active.)

The initial output shows the running FSMs grouped by the cluster in which they are located. The hostnames or IP addresses are those that are advertised to clients. When more than one location is listed, one or more these will be marked as preferred. This means that this address is on the metadata network and should be used, if possible, by a client to make a connection to the FSM. The remaining addresses can be used if a connection can not be made using a preferred address.

Note: An administrator can filter out addresses that are not to be advertised by using the snfs_metadata_network_filter.json(5) configuration file.

Then (optionally) use the select command described below to pick an FSM to connect to. Once connected, the command will display basic information about the selected file system and prompt for further commands.

Note that a few commands such as paths, disks, start, and stop require information obtained from the local fsmpm(8) only, so there is is no need to select an FSM prior to using them.


-H FSMHostName
Connect to the FSM located on the machine FSMHostName. By default cvadmin will attempt to connect to an FSM located on the local machine.
-F FileSystemName
Automatically set the file system FileSystemName as the active file system in cvadmin.
When listing file systems with the select command, display [managed] next to each file system with DataMigration enabled. This option is currently only intended for use by support personnel.
-f filename
Read commands from filename
-e command
Execute command(s) and exit
Show numerical addresses instead of trying to determine symbolic host
Enable extended commands.


The cvadmin commands can be used to display and modify the SNFS active configuration. When a modification is made, it exists only as long as the FSM is running. More permanent changes can be made in the configuration file. Refer to the snfs_config(5) man page for details. The following commands are supported.

The syntax for file_system_name is: name[@cluster[/addom]]

activate file_system_name [hostname_or_IP_address]
Activate a file system file_system_name. This command may cause an FSM to activate. If the FSM is already active, no action is taken.
activate file_system_name number_of_votes
Quantum Internal only. Bypass the election system and attempt to activate the fsm on this node.
cluster select [N|[+]cluster_name]
Select a cluster to be used by other commands when the cluster name isn’t explicitly given with the FSM name. Normally only a known cluster name can be selected, but preceding it with a ‘+‘ will force an unknown cluster name to be used. A cluster name of none or 0 will de-select the currently selected cluster name. Using no arguments or just select will show all known clusters. Cluster_name is [@]cluster[/addom].
cluster filter [N|cluster_name]
Set a filter for the output of the select command. When a cluster filter is set, only FSMs in that cluster will be displayed by select. The filter can be set to all the clusters in an administrative domain by using A cluster name of none or 0 will disable the filter. Using no arguments or just filter will show all known clusters. Cluster_name is [@]cluster[/addom].
coord [[on] hostname_or_IP_address]
Display the list of NSS coordinators on the local host or on the specified host.
debug [[+|] flag [ … ]]
View or set the File System Manager’s debugging flags. Entering the command with no flag will return current settings, the location of the FSM log file and a legend describing what each setting does. By entering the command with a flag list, the FSM Debugging Flags will be set accordingly. Each flag can be either a name or numeric value. Names will be mapped to their numeric value, and may be abbreviated as long as they remain unique. Numeric values are specified using a standard decimal or hexadecimal (0x) value of up to 32 bits. Using ‘+‘ or ‘‘ enables (‘+‘) or disables (‘‘) only the selected flags, leaving all other flags unchanged.NOTE – Setting Debugging Flags will severely impact the FSM‘s performance! Do this only when directed by an Quantum specialist.
Forcefully disconnect a client from the FSM. With no arguments, discon displays the list of connected clients. When supplied an index, discon will immediately disconnect the specified client. Only use when recommended by Technical Support. Also see the “repblocked” command.
disks [refresh]
Display the StorNext disk volumes local to the system that cvadmin is attached to. Using the optional refresh argument will force the fsmpm to re-scan all volumes before responding. If the fsmpm’s view of the disks in any file system changes compared with the FSM’s view of that client’s disks as a result of the refresh, a disconnect and reconnect to the FSM will take place to resynchronise the file system state.
disks [refresh] fsm
Display the StorNext meta-data disk volumes in use by the fsm. If the optional refresh argument is used, additional paths to these volumes may be added by the fsm.
fail [file_system_name|index_number]
Initiate an FSM Failover of file system file_system_name. This command may cause a stand-by FSM to activate. If an FSM is already active, the FSM will shut down. A stand-by FSM will then take over. If a stand-by FSM is not available the primary FSM will re-activate after failover processing is complete.
Report counts of files, directories, symlinks and other objects which are anchored by a user type inode. These include named streams, block and character device files, fifos or pipes and named sockets. If the file system is undergoing conversion to StorNext 5.0, conversion progress is displayed and counters reflect the count of converted objects.
fsmlist [file_system_name] [ on hostname_or_IP_address]
Display the state of FSM processes, running or not. Optionally specify a single file_system_name to display. Optionally specify the host name or IP address of the system on which to list the FSM processes.
Query cluster-wide file/record lock enforcement. Currently cluster-wide file locks are automatically used on Unix. Windows file/record locks are optional.If enabled, byte-range file locks are coordinated through the FSM, allowing a lock set by one client to block overlapping locks by other clients. If disabled, then byte-range locks are local to a client and do not prevent other clients from getting byte-range locks on a file, however they do prevent overlapping lock attempts on the same client.
help (?)
The help or ? command will display a command usage summary.
latency-test [index_number|all] [seconds]
Run an I/O latency test between the FSM process and one client or all clients. The default test duration is 2 seconds.
Report metadata usage. Also provide an estimate on the value of bufferCacheSize that will allow all metadata to be cached.
mdarchive [status|backup|rebuild|prune]
Run commands targeting the metadata archive associated with the selected FSM. Running mdarchive without command arguments will display the full path location of the metadata archive.
mdarchive status
The status command prints the progress of the current metadata archive activity, if any. If generating a new metadata archive or restoring an existing one, the percentage complete will be displayed. Otherwise, the current update backlog is displayed.
mdarchive rebuild [new]
If metadataArchiveDays is set to zero then the rebuild command will force the FSM to discard the existing metadata archive and generate a new one, otherwise the FSM will rebuild the existing metadata archive in a way that will preserve history across the rebuild. Rebuilds can be performed online while clients are active in the file system.When metadataArchiveDays is set to a value greater than zero, requesting a new rebuild will cause the FSM to delete the current metadata archive before starting the rebuild. All metadata history that existed prior to the new rebuild will be lost but the rebuild will shrink the mdarchive down to its minimum size. Requesting a new rebuild has no effect when metadataArchiveDays is set to zero because the existing metadata archive is always deleted before starting the rebuild in that case.

WARNING: When using the new argument to the rebuild command, all metadata history that existed prior to the rebuild will be lost. This will prevent external applications like snaudit and snhistory from reporting events that occurred prior to the rebuild and will prevent snrecover from recovering files that were deleted prior to the rebuild.

mdarchive rebuild wait
Wait for an ongoing rebuild to complete and report status periodically.
mdarchive backup [full|partial] pathname
For an FSM with a current mdarchive, request a backup copy be generated as a compressed tar file. The pathname must specify an existing directory on the FSM node and include the file name to be created. A full dump contains all the content, a partial dump contains all the content changed since the last backup.
mdarchive backup wait
Wait for an ongoing mdarchive backup to complete and report progress periodically.
mdarchive prune
The prune command will force the removal of expired historical data from the metadata archive. This command is ignored and a message is written to the system log file if metadataArchiveDays is set to zero in the configuration file or if it is issued while an mdarchive build, file recovery, or metadata restore is in progress.
Display the StorNext disk volumes visible to the local system. The display is grouped by <controller> identity, and will indicate the “Active” or “Passive” nature of the path if the Raid Controller has been recognized as configured in Active/Active mode with AVAT enabled.
proxy [long]
Display Disk Proxy servers and optionally display the disks they serve for this file system.
proxy who hostname
The “who” option displays all proxy connections for the specified host.
qbm trace [clientid]
Create a QBM internal trace file on the MDC. If clientid is specified (where clientid is the client’s login id), a client trace is also also generated. This command creates an SNQBM_xxx file in the debug directory. Currently, only Windows clients generate internal traces. This command is for Quantum use only.
qbm show stripe-group-num
Show the QBM allocation table for a stripe group given the stripe-group index. All bandwidth (BW) is in MB/sec. The display includes the following sub-tables:Stripe Group (SG) Table: SG max (capacity), BW currently free, the total BW in the reserve pools, and the total over-subscripted (over capacity) amount.

Priority (Pri) Table: table class name, count of clients in the priority, total bandwidth allocated at this priority, minimum BW, maximum BW, extra (over min) BW, reserved BW used/total reserve allocated to this priority, and current BW used.

Client Entry: list number, IP address, client login number, bandwidth information – minimum, maximum and current BW, restore BW, flag (l – client asked for less, m – client asked for more, g – client given more BW over minimum BW).

qbm newconfig
Re-read the <_file_system_name_>_qbm.conf file and update the clients.
Display per-stripe group QOS statistics. Per-client QoS statistics are also displayed under each qos-configured stripe group.
This command will disconnect cvadmin from the FSM and exit.
ras enq [ nomerge ] event “detail string”
Generate an SNFS RAS event. If “nomerge” is specified, multiple instances of the RAS event are not merged into a single ticket. For internal use only.
ras enq [ nomerge ] event reporting_FRU violating_FRU “detail string”
Generate a generic RAS event. If “nomerge” is specified, multiple instances of the RAS event are not merged into a single ticket. For internal use only.
Generate a report of files that may be causing open operations to block due to an unresponsive client that is slow to acknowledge a request to change state. Such clients should be inspected to determine whether there is a reason for their lack of response. One common cause of unresponsiveness is that Xsan clients have entered sleep mode. The settings on these clients should be adjusted so they never sleep. If the client is known to be hung, the connection to the FSM can be reset using the discon command.
Generate a report that displays the file locks currently held. Note: this command is only intended for debugging purposes by support personnel. In future releases, the format of the report may change or the command may be removed entirely. Running the repfl command will write out a report file and display the output filename.
Generate a report that displays all files that are currently open on each StorNext client. Running the repof command will write out a report file and display the output filename containing that report.
The information displayed for each file is: the pathname, inode number, the number of “writers” (which is the # of times this client has opened the file for write — usually 1 or 0), and stat information.
Next a line is printed showing the open state across all clients. The open state contains: the count of different clients with this file open, the # of those clients that are writers, and which client, if non-zero, has the file open exclusively or that owns the ioToken. The open state flags are displayed followed by a set of strings indicating the meaning of some of the bits in the flags field. Some examples:flags 0x2000: shared_read
flags 0x5000: I/O token shared_excl
flags 0x5009: revoking I/O token shared_excl
flags 0x9: revoking OLD ExclusiveIf revoking is indicated, that means the client(s) has been sent a message and a response is being awaited. If client is zero with revoking, a message was sent to one or more clients in shared_read.
See also the repblocked command.

In future releases, the format of the report may change.

resetrpl [clear]
Repopulate Reverse Path Lookup (RPL) information. The optional clear argument causes existing RPL data to be cleared before starting repopulation. Note: resetrpl is only available when cvadmin is invoked with the -x option. Running resetrpl may significantly delay FSM activation. This command is not intended for general use. Only run resetrpl when recommended by Technical Support.
restartd daemon [once]
Restart the daemon process. For internal use only.
select [file_system_name|N]
Select an active FSM to view and modify. If no argument is specified, a numbered list of FSMs and running utilities will be displayed. If there is only one active file system in the list, it will automatically be selected.When a running utility is displayed by the select command, it will show the following information. First the name of the file system is displayed. Following that, in brackets “[]”, is the name of the utility that is running. Third, a letter indicating the access type of the operation. The options here are (W) for read-write access, (R) for read-only access and (U) for unique access. Finally, the location and process id of the running utility is displayed.

If file_system_name is specified, then cvadmin will connect to the current active FSM for that file system. If N (a number) is specified, cvadmin will connect to the Nth FSM in the list. However, only active FSMs may be selected in this form.

show [groupname] [long]
Display information about the stripe groups associated with the selected file system. If a stripe group name groupname is given only that stripe group’s information will be given. Omitting the groupname argument will display all stripe groups associated with the active file system. Using the long modifier will additionally display detailed information about the disk units associated with displayed stripe groups.
start file_system_name [on hostname_or_IP_address]
Start a File System Manager for the file system file_system_name. When the command is running on an MDC of an HA cluster, the local FSM is started, and then an attempt is made to start the FSM on the peer MDC as identified by the /usr/cvfs/config/ha_peer file. When the optional hostname_or_IP_address is specified, the FSM is started on that MDC only. The file system’s configuration file must be operational and placed in /usr/cvfs/config/<file_system_name>.cfgx before invoking this command. See snfs_config(5) for information on how to create a configuration file for an SNFS file system.
startd daemon [once]
Start the daemon process. For internal use only.
Display the general status of the file system. The output will show the number of clients connected to the file system. This count includes any administrative programs, such as cvadmin. Also shown are some of the static file-system-wide values such as the block size, number of stripe groups, number of mirrored stripe groups and number of disk devices. The output also shows total blocks and free blocks for the entire file system.
stats client_IP_address [clear]
Display read/write statistics for the selected file system. This command connects to the host FSMPM who then collects statistics from the file system client. The ten most active files by bytes read and written and by the number of read/write requests are displayed. If clear is specified, zero the stats after printing.
stop file_system_name [on hostname_or_IP_address]
Stop the File System Manager for file_system_name. This will shut down the FSM for the specified file system on every MDC. When the optional hostname or IP address is specified, the FSM is stopped on that MDC only. Further operations to the file system will be blocked in clients until an FSM for the file system is activated.
stopd daemon
Start the daemon process. For internal use only.
winidmap __username__
Show the MDC-mapped user id and group information for the username.
Query client list for the active file system. The output will show the following information for each client.SNFS I.D. – Client identifier
Type – Type of connection. The client types are:
FSM – File System Manager(FSM) process
ADM – Administrative(cvadmin) connection
CLI – File system client connection. May be followed by a CLI
type character:
S – Disk Proxy Server
C – Disk Proxy Client
H – Disk Proxy Hybrid Client. This is a client that has
been configured as a proxy client but is operating
as a SAN client.
Location – The client’s hostname or IP address that was used by this client to connect to the FSM.
Up Time – The time since the client connection was initiated
License Expires – The date that the current client license will expire


Invoke the cvadmin command for file system named snfs1.

[root@dev-snc-daiquiri-n1 debug]# cvadmin -F snfs1
StorNext Administrator

Enter command(s)
For command help, enter "help" or "?".

List FSS

File System Services (* indicates service is in control of FS):
Selected Cluster: _cluster0/_addom0

Cluster: _cluster0/_addom0
 1>*fs1-man[0]           located on (pid 31711)
                         located on Qnode1:52006
                         located on
                         located on [preferred]
 2> fs1-man[0]           located on (pid 42977)
                         located on
                         located on
                         located on Qnode2:52004
                         located on
                         located on [preferred]
 3>*shared-SV1535CKH00012[0] located on (pid 23220)
                         located on Qnode1:52003
                         located on
                         located on [preferred]
 4> shared-SV1535CKH00012[0] located on (pid 42382)
                         located on
                         located on
                         located on Qnode2:52003
                         located on
                         located on [preferred]

Cluster: cluster1/_addom0
 5>*shared[0]            located on (pid 8650)
 6> shared[0]            located on (pid 19417)
 7>*snfs1[0]             located on (pid 8651)
 8> snfs1[0]             located on (pid 19431)

Select FSM "snfs1"

 Created           :    Wed Sep 26 12:27:43 2018
 Active Connections:    2
 Fs Block Size     :    4K
 Msg Buffer Size   :    8K
 Disk Devices      :    6
 Stripe Groups     :    3
 Fs Blocks         :    2684342720 (10.00 TB)
 Fs Blocks Free    :    2679776316 (9.98 TB) (99%)

snadmin (snfs1@cluster1/_addom0) >

Show all the stripe groups in the file system;

snadmin (snfs1@cluster1/_addom0) > show
Show stripe groups (File System "snfs1@cluster1/_addom0")

Stripe Group 0 [sg0]  Status:Up,MetaData,Journal,Exclusive
  Total Blocks:536868544 (2.00 TB)  Reserved:0 (0.00 B) Free:536841775 (2.00 TB)
  MultiPath Method:Rotate
    Primary  Stripe [sg0]  Read:Enabled  Write:Enabled

Stripe Group 1 [sg1]  Status:Up
  Total Blocks:1610605632 (6.00 TB)  Reserved:1082880 (4.13 GB) Free:1607753562
(5.99 TB) (99%)
  MultiPath Method:Rotate
    Primary  Stripe [sg1]  Read:Enabled  Write:Enabled

Stripe Group 2 [sg2]  Status:Up
  Total Blocks:1073737088 (4.00 TB)  Reserved:1082880 (4.13 GB) Free:1072022754
(3.99 TB) (99%)
  MultiPath Method:Rotate
    Primary  Stripe [sg2]  Read:Enabled  Write:Enabled

snadmin (snfs1@cluster1/_addom0) >

Display the long version of the sg2 stripe group;

snadmin (snfs1@cluster1/_addom0) > show sg2 long
Show stripe group "sg2" (File System "snfs1@cluster1/_addom0")

Stripe Group 2 [sg2]  Status:Up
  Total Blocks:1073737088 (4.00 TB)  Reserved:1082880 (4.13 GB) Free:1072022754 (3.99 TB) (99%)
  MultiPath Method:Rotate
  Stripe Depth:2  Stripe Breadth:64 blocks (256.00 KB)
  Affinity Key:af1
  Realtime limit IO/sec:0 (~0 mb/sec) Non-Realtime reserve IO/sec:0
    Committed RTIO/sec:0 Non-RTIO clients:0 Non-RTIO hint IO/sec:0
  Disk stripes:
    Primary  Stripe [sg2]  Read:Enabled  Write:Enabled
      Node 0 [t1_0008]
      Node 1 [t1_0009]

snadmin (snfs1@cluster1/_addom0) >




cvfs(8), snfs_config(5), snfs_metadata_network_filter.json(5), fsmpm(8), fsm(8), mount_cvfs(8), sgmanage(8)