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sys_attrs_dlm(5)
NAME
sys_attrs_dlm - dlm subsystem attributes
DESCRIPTION
This reference page lists and describes attributes for the distributed lock
manager (dlm) kernel subsystem. Refer to the sys_attrs(5) reference page
for an introduction to the topic of kernel subsystem attributes.
dlm_name
Name and version number of the DLM. For TruCluster Server Version 5.1A
this value is "Distributed Lock Manager - V2.0".
dlm_lkbs_allocated
Number of active locks on this member system. The value of this
attribute accounts for all copies of locks on this node.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_rsbs_allocated
Number of resources mastered on this member system. Each resource name
is represented by a resource block. When a process on the local system
has a lock on a given resource, a resource block exists on both the
system that is the resource's master and on the local system. The
locks on a given resource are represented by a chain of lock blocks
connected to the resource block.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_tot_lkids
Total number of lock IDs on this cluster member. Each member system has
its own lock ID table, which describes each lock block that is in use
on that system. Each allocated lock block is identified by a lock ID
handle. The DLM uses this table to quickly access lock blocks.
Supported operations: Query
Default value: 8191
Minimum value: 0
Maximum value: 0
dlm_lkids_inuse
Number of lock IDs actually in use on this member system. This value
matches the number of active locks (dlm_lkbs_allocated).
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlckq_len
Number of locks currently on the deadlock queue.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_timeoutq_len
Number of locks currently on the timeout queue.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_lock_in
Number of new lock requests from other cluster members to this member.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_lock_loc
Number of new lock requests that are mastered on this member system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_lock_out
Number of new lock requests from this member to locks mastered on other
member systems.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_mng_local
Number of new lock requests from this member to either the director or
other member systems thought to be the lock master.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_resend
Number of new lock requests sent from this member to other member
systems that resulted in a resend response. A cluster member returns a
resend response when it is not, or is no longer, the master for the
requested lock. For example, this can happen when the lock's master is
transitioning from one system to another. A high number of resend
responses indicates that the lock master is moving from member to
member, which affects performance.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_retry
Number of new lock requests sent from this member to other member
systems that resulted in a retry response. For example, a cluster
member returns a retry response, for instance, when it has insufficient
resources to satisfy the request, or if a lock rebuild started when the
request was being sent.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_cvt_in
Number of lock conversion requests from other member systems to this
member as the resource master.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_cvt_loc
Number of lock conversion requests for resources mastered locally.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_cvt_out
Number of lock conversion requests from this member to locks mastered
on other member systems.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_unlock_in
Number of unlock requests from other cluster members to this member as
the resource master.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_unlock_loc
Number of unlock requests for resources mastered locally.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_unlock_out
Number of unlock requests from this member to locks mastered on other
member systems.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_blk_in
Number of blocking notifications sent from member systems mastering
resources to processes on the local system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_blk_loc
Number of blocking notifications sent to processes on the local system
for resources mastered on the local system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_blk_out
Number of blocking notifications sent to processes on other systems for
resources mastered on the local system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_dir_in
Number of times the local node received new lock requests as the
directory node. This usually results in a resend request or a message
to the requestor to master the lock locally.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_dir_out
Number of requests the local node has sent to other directory nodes.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_timeo_lks
Number of locks that have timed out (that is, have not been granted
within the timeout interval specified on the initial request).
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlck_in
Number of deadlock search requests involving locks or processes on the
local system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlck_out
Number of deadlock search requests from this member to other member
systems.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlck_srch
Number of deadlock searches that have occurred on the local system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlck_cvt_fnd
Number of conversion deadlocks detected on the local system.
Conversion deadlocks are described in the TruCluster Server Cluster
Highly Available Applications manual.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_ddlck_res_fnd
Number of multiple resource deadlocks found on the local system.
Multiple resource deadlocks are described in the TruCluster Server
Cluster Highly Available Applications manual.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_notqd
Number of lock requests that were not queued (that is, those requests
that either were granted or will be granted).
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_wait
Number of new lock requests that were placed on the waiting queue of
the resource.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_cvt_wait
Number of conversion lock requests that were placed on the conversion
queue of the resource.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_collect_zero
Number of times a process attempted to collect a blocking notification
after the blocking notification had been cancelled or delivered.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_no_msg_mem
Number of times the DLM has failed in an attempt to allocated memory
for a message.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_expand_lkid_tbl
Indicates the number of times the DLM had to expand the lock ID segment
table (an array of pointers to lock ID segments).
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_add_lkid_seg
Indicates the number of times the DLM had to allocate memory for
another block (segment) of lock ID handles.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_pdbs_allocated
Number of processes running on this cluster member that are using the
DLM.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_kpdbs_allocated
This is equivalent to the dlm_pdbs_allocated attribute, except it
relates to kernel threads using kernel DLM interfaces instead of user
processes.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_gdbs_allocated
Number of group lock containers on this cluster member.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_perm_gdbs
Number of permanent group lock containers on this member system.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_txids_allocated
Number of transactions active on this cluster member.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_long_rhash_chain
Length of the longest linked list in the resource hash table.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 0
dlm_empty_rhash_chain
Number of empty linked lists (chains) in the resource hash table.
Supported operations: Query
Default value: 8191
Minimum value: 0
Maximum value: 0
dlm_txid_wrap
Set when the number of DLM transactions done on a single lock ID handle
has overflowed the largest value that can fit in an unsigned long
datum.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4
rhash_size
Number of entries in the resource hash table on this member system.
Increasing the size of the resource hash table can shorten the lengths
of the chains of which the table is comprised. By reducing the time it
takes for the DLM to search these chains, this can improve DLM
performance.
Supported operations: Query; Configure at boot time
Default value: 8192
Minimum value: 1
Maximum value: 2147483647
pdb_hash_size
Number of entries in the process hash table on this member system. Set
this attribute to the approximate number of processes that will use the
DLM on this system.
Supported operations: Query; Configure at boot time
Default value: 64
Minimum value: 1
Maximum value: 2147483647
kpdb_hash_size
This is equivalent to the pdb_hash_size attribute, except it relates to
kernel threads using kernel DLM interfaces instead of user processes.
Supported operations: Query; Configure at boot time
Default value: 64
Minimum value: 1
Maximum value: 2147483647
gdb_hash_size
Number of entries in the group lock container hash table on this member
system. Set this attribute to the approximate number of group lock
containers that will be on this member system.
Supported operations: Query; Configure at boot time
Default value: 64
Minimum value: 1
Maximum value: 2147483647
txid_hash_size
Number of entries in the transaction hash table on this member system.
Set this attribute to the approximate number of transactions that will
be active in the cluster.
Supported operations: Query; Configure at boot time
Default value: 64
Minimum value: 1
Maximum value: 2147483647
dlm_deadlock_wait
Length of time, in seconds, each lock on the conversion, wait, and
timeout queues waits to be included in a deadlock search. (The
dlm_deadlock scan attribute controls the frequency of deadlock searches
for resources mastered on this member.) A conversion or multiple
resource deadlock can exist up to dlm_deadlock_wait seconds before it
is detected. You can reduce the amount of time it takes for deadlock
detection for all queued locks by reducing the value of this attribute
and rebooting the cluster. The dlm_deadlock_wait attribute must be set
to the same value on all cluster members.
Supported operations: Query; Configure at boot time
Default value: 10
Minimum value: 1
Maximum value: 4294967295
dlm_dirwt
Directory weight value. Setting the directory weight value increases
the likelihood that this node will be the director of a resource. Its
value can range from 0 to 4, where 4 provides the highest likelihood.
Supported operations: Query
Default value: 1
Minimum value: 0
Maximum value: 4
dlm_validate_rsb
Validate resource block.
Do not modify the default setting for this attribute unless instructed
to do so by support personnel or by patch kit documentation.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 0
Minimum value: 0
Maximum value: 255
dlm_locks_cfg
Number of locks configured on this member system at boot time. To
improve lock startup performance, set this attribute to twice the
number of expected locks.
Supported operations: Query; Configure at boot time
Default value: 8192
Minimum value: 1
Maximum value: 1073741824
dlm_deadlock_scan
Frequency (in seconds) with which the DLM initiates deadlock detection
scans in the cluster. This attribute is used in conjunction with the
dlm_deadlock_wait attribute to determine how often a lock on the
conversion, deadlock, or timeout queue participates in deadlock
detection. The dlm_deadlock_scan attribute must be set to the same
value on all cluster members.
Supported operations: Query; Configure at boot time; Reconfigure at run
time
Default value: 1
Minimum value: 1
Maximum value: 4294967295
dlm_zero_stats
Reset all DLM statistics to 0 (zero).
Supported operations: Query; Reconfigure at run time
dlm_rd_count
Number of recovery domains in the cluster.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 4294967295
dlm_rd_in
Number of recovery domain messages sent by this node.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 18446744073709551615
dlm_rd_out
Number of recovery domain messages received by this node.
Supported operations: Query
Default value: 0
Minimum value: 0
Maximum value: 18446744073709551615
SEE ALSO
sys_attrs(5)
Cluster Administration
Cluster Highly Available Applications
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Index for
Section 5 |
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Alphabetical
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