Dell Unity：NAS 伺服器在租約到期超過 5 分鐘時仍鎖定 NFSv4

• 用戶端未正常關機後，Unity NAS 伺服器上可能會發現受影響檔案上的 NFS 鎖定最長達 6 分鐘。
• 在 Unity 解除鎖定之前，其他用戶端無法鎖定檔案。 
• 這些鎖定可使用 svc_lockd 命令。

root@none spa:/cores/service/user# date ;svc_lockd NAS_Server list
Mon Oct 27 08:43:36 UTC 2025
NAS_Server : commands processed: 1
command(s) succeeded
output is complete

FileSystem: ufs64 rw /.etc SV20000009=536870921 expfsidstr=67fcca47-e0ae-3301-b819-0e0e84d61219  nooplock triggerlevel=0 nocepp nfsv4locking=ADVISORY renamepolicy=CIFS accesspolicy=NATIVE minactfssize=2816  NumTimesFsckHasModifiedFS=0
  inum=9465
    fldp=0x0008c74ba8 Deleg=0 Opens=1 RangeLocks: Mandatory=0 Advisory=0
  inum=9466
    fldp=0x0008c74d00 Deleg=0 Opens=1 RangeLocks: Mandatory=0 Advisory=0
  inum=9468
    fldp=0x0008c75260 Deleg=0 Opens=1 RangeLocks: Mandatory=0 Advisory=0

FileSystem: ufs64 rw /Ghost_NFS01_Official_FS SV2000000a=536870922 expfsidstr=67fccdbd-4304-dbdd-3b8f-00601696feeb  nooplock triggerlevel=512 nocepp nfsv4locking=MANDATORY renamepolicy=CIFS accesspolicy=UNIX minactfssize=2816 thinprovisioning maxsize=204544 hwm=0  NumTimesFsckHasModifiedFS=0
  inum=9465
    fldp=0x0008c753b8 Deleg=0 Opens=1 RangeLocks: Mandatory=1 Advisory=0   <<<<<<<<<<< Lock placed by client on file inode 9465

Command succeeded

root@none spa:/cores/service/user# date ;svc_lockd NAS_Server info fldp=0x0008c753b8
Mon Oct 27 08:43:46 UTC 2025
NAS_Server : commands processed: 1
command(s) succeeded
output is complete

fldp=0x0008c753b8 inum=9465 ref=1 delegp=0x0000000000 totalLocksCount=2 layoutsCount=0
 Global accessMode=[RWd], denyMode=[rwd]
 Open access=RD-WR deny=NONE [NFSv4_Linux NFSv4.2 test_client_OPEN_0x0008577fc8]

 Lock 0x00064-00064:     -SHR-MAND [credp=0x000857dfc8 NFSv4_Linux NFSv4.2 test_client_LOCK_0x000857dfc8]  <<<<<<<<<< byte-range shared mandatory lock

NFSv4 協定使用租用期，在此期間，伺服器向用戶端授予檔鎖定。客戶端必須定期續訂此租約以保持鎖定。 

• 如果用戶端意外關閉，則無法續訂其租約。
• Unity NAS 伺服器會等待租用期到期，再嘗試回收鎖定。
• 默認情況下，Unity 不會立即釋放這些資源。隱藏參數， nfsv4.cleaningInterval，定義額外的等待期。
• 預設值 nfsv4.cleaningInterval 值為 300 秒（5 分鐘）。
• 因此，鎖定的檔僅在標準租用期加上 5 分鐘的清理間隔之後釋放，從而導致總等待時間約為 5 到 6 分鐘。 

可使用 nfsv4.cleaningInterval 可以降低值，以減少 NAS 伺服器保持鎖定的時間。

• 確認目前的值 nfsv4.cleaningInterval 是。

root@none spa:/cores/service/user# svc_nas NAS_Server -param -facility nfsv4 -i cleaningInterval -v

NAS_Server :
param nfsv4.cleaningInterval added into the list of visible params

name                    = cleaningInterval
facility_name           = nfsv4
default_value           = 300
current_value           = 300
configured_value        =
param_type              = global
user_action             = none
change_effective        = immediate
range                   = (30,3600)
description             = Time interval in seconds between two successive clean up of orphan states

detailed_description
This param defines how long the server will keep client resources once the client has expired its lease. It is expressed in a count of seconds.

• 修改 nfsv4.cleaningInterval 參數的值較低，例如 30 秒。 

root@none spa:/cores/service/user# svc_nas ALL -param -facility nfsv4 -modify cleaningInterval -v 30
 
SPA : done
SPB : done

• 確認該值設置為 30 秒。 

root@none spa:/cores/service/user# svc_nas NAS_Server -param -facility nfsv4 -i cleaningInterval -v
 
NAS_Server :
param nfsv4.cleaningInterval added into the list of visible params
 
name                    = cleaningInterval
facility_name           = nfsv4
default_value           = 300
current_value           = 30
configured_value        = 30
param_type              = global
user_action             = none
change_effective        = immediate
range                   = (30,3600)
description             = Time interval in seconds between two successive clean up of orphan states
 
detailed_description
This param defines how long the server will keep client resources once the client has expired its lease. It is expressed in a count of seconds.