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Definitions of performance counters

You must be aware of the performance counters in Performance Advisor that enable you to collect data for each performance object.

The availability of the counters and their descriptions might vary depending on the version of Data ONTAP running on the storage system.

Aggregate object

Counter name Description Unit
total_transfers Total number of disk operations serviced by the aggregate per sec
user_reads Number of user read operations performed by the aggregate per sec
user_writes Number of user write operations performed by the aggregate per sec
cp_reads Number of read operations to the aggregate during consistency-point processing per sec
user_read_blocks Number of blocks transferred for user read operations per sec
user_write_blocks Number of blocks transferred for user write operations per sec
cp_read_blocks Number of blocks transferred for consistency-point read operations per sec

cifs object

Counter name Description Unit
cifs_latency Average latency for CIFS operations millisec
cifs_ops Total number of CIFS operations per sec
cifs_read_latency Average latency, for CIFS read operations millisec
cifs_write_latency Average latency, for CIFS write operations millisec
cifs_read_ops Total number of CIFS read operations per sec
cifs_write_ops Total number of CIFS write operations per sec

cifs:node object (clustered environments only)

Counter name Description Unit
cifs_latency Aggregated CIFS latency at the node level microsec
cifs_ops Aggregated CIFS operations at the node level per sec

cifs:vserver object (clustered environments only)

Counter name Description Unit
cifs_latency Aggregated CIFS latency at the Vserver level microsec
cifs_ops Aggregated CIFS operations at the Vserver level per sec

disk object

Counter name Description Unit
total_transfers Total number of disk operations performed by the aggregate per sec
user_reads Number of user read operations performed by the aggregate per sec
user_writes Number of user write operations performed by the aggregate per sec
cp_reads Number of read operations to the aggregate during consistency point processing per sec
guaranteed_reads Number of disk read operations initiated each second for RAID reconstruction or scrubbing activities per sec
guaranteed_writes Number of write operations initiated each second for RAID reconstruction or scrubbing activities per sec
user_read_chain Average number of blocks transferred in each user read operation NA
user_write_chain Average number of blocks transferred in each user write operation NA
cp_read_chain Average number of blocks transferred in each consistency-point read operation during a consistency point NA
disk_busy Time since the last outstanding request to the disk percent
user_read_blocks Number of blocks transferred for user read operations per sec
user_write_blocks Number of blocks transferred for user write operations per sec
cp_read_blocks Number of blocks transferred for consistency-point read operations per sec
user_read_latency Average latency per block, in microseconds, for user read operations microsec
user_write_latency Average latency per block, in microseconds, for user write operations microsec
cp_read_latency Average latency per block, in microseconds, for consistency-point read operations microsec

disk object (7-Mode environments only)

Counter name Description Unit
throughput Disk KB read and written per sec

fcp object (7-Mode environments only)

Counter name Description Unit
fcp_ops FCP operations per second per sec
fcp_write_data FCP bytes written per second b per sec
fcp_read_data FCP bytes read per second b per sec
fcp_read_latency Average latency of read operations for all the LUNs in the system accessed over FCP millisec
fcp_read_ops Total number of read operations for all the LUNs in the system accessed over FCP per sec
fcp_write_latency Average latency of write operations for all the LUNs in the system accessed over FCP millisec
fcp_write_ops Total number of write operations for all the LUNs in the system accessed over FCP per sec
fcp_throughput Total FCP data sent and received by the system b per sec
fcp_latency Average latency for FCP operations millisec
fcp_latency_hist FCP latency histogram NA
fcp_read_latency_hist Latency histogram for FCP read operations NA
fcp_write_latency_hist Latency histogram for FCP write operations NA
fcp_read_size_histo Histogram of FCP read operations NA
fcp_write_size_histo Histogram of FCP write operations NA

fcp_lif:node object (clustered environments only)

Counter name Description Unit
read_ops Aggregated FCP read operations at the node level per sec
write_ops Aggregated FCP write operations at the node level per sec
other_ops Other FCP operations at the node level per sec
read_data Aggregated read data at the node level b per sec
write_data Aggregated write data at the node level b per sec
avg_latency Average latency for all operations on FCP at the node level millisec
avg_read_latency Average latency of read operations for all the LUNs in the system accessed over FCP at the node level millisec
avg_write_latency Average latency of write operations for all the LUNs in the system accessed over FCP at the node level millisec
read_latency_hist Latency histogram for FCP read operations at the node level NA
write_latency_hist Latency histogram for FCP write operations at the node level NA
read_size_hist Histogram of FCP read operations at the node level NA
write_size_hist Histogram of FCP write operations at the node level NA

fcp_lif:vserver object (clustered environments only)

Counter name Description Unit
read_ops Aggregated FCP read operations at the Vserver level per sec
write_ops Aggregated FCP write operations at the Vserver level per sec
other_ops Other FCP operations at the Vserver level per sec
read_data Aggregated read data at the Vserver level b per sec
write_data Aggregated write data at the Vserver level b per sec
avg_latency Average latency for all operations on FCP at the Vserver level millisec
avg_read_latency Average latency for read operations on FCP at the Vserver level millisec
avg_write_latency Average latency for write operations on FCP at the Vserver level millisec
avg_other_latency    
read_latency_hist Latency histogram for FCP read operations at the Vserver level NA
write_latency_hist Latency histogram for FCP write operations at the Vserver level NA
read_size_hist Histogram of FCP read operations at the Vserver level NA
write_size_hist Histogram of FCP write operations at the Vserver level NA

ifnet object

Counter name Description Unit
recv_packets Packets received per second per sec
recv_errors Errors per second while receiving packets per sec
send_packets Packets sent per second per sec
send_errors Errors per second while sending packets per sec
collisions Collisions per second on CSMA interfaces per sec
recv_data Total bytes received per second b per sec
send_data Total bytes sent per second b per sec
recv_mcasts Packets received per second through multicast per sec
send_mcasts Packets sent per second through multicast per sec
total_data Total data sent and received over the interface b per sec
total_errors Total data sent and received over the interface per sec
total_mcasts Total number of errors while receiving and sending over the interface per sec
total_packets Total packets sent and received through multicast per sec

iSCSI object (7-Mode environments only)

Counter name Description Unit
iscsi_ops iSCSI operations per second per sec
iscsi_write_data iSCSI bytes written per second b per sec
iscsi_read_data iSCSI bytes read per second b per sec
iscsi_read_latency Average latency of read operations for all the LUNs in the system accessed over iSCSI millisec
iscsi_read_ops Total number of read operations for all the LUNs in the system accessed over iSCSI per sec
iscsi_write_latency Average latency of write operations for all the LUNs in the system accessed over iSCSI millisec
iscsi_write_ops Total number of write operations for all the LUNs in the system accessed over iSCSI per sec
iscsi_throughput Total iSCSI data sent and received by the system b per sec
iscsi_latency Average latency for iSCSI operations millisec
iscsi_latency_hist iSCSI latency histogram NA
iscsi_read_latency_hist Latency histogram for iSCSI read operations NA
iscsi_write_latency_hist Latency histogram for iSCSI write operations NA
iscsi_read_size_histo Histogram of iSCSI read operations NA
iscsi_write_size_histo Histogram of iSCSI write operations NA

iscsi_lif:vserver object (clustered environments only)

Counter name Description Unit
iscsi_read_ops Aggregated total number of read operations for all the LUNs in the system accessed over iSCSI, at the Vserver level per sec
iscsi_write_ops Aggregated total number of write operations for all the LUNs in the system accessed over iSCSI, at the Vserver level per sec
avg_latency Average latency for all operations on iSCSI at the Vserver level millisec
avg_read_latency Average latency for read operations on iSCSI at the Vserver level millisec
avg_write_latency Average latency for write operations on iSCSI at the Vserver level millisec
avg_other_latency    
read_latency_hist Latency histogram for iSCSI read operations at the Vserver level NA
write_latency_hist Latency histogram for iSCSI write operations at the Vserver level NA
iscsi_other_ops Other iSCSI operations at the Vserver level per sec
read_size_hist Histogram of iSCSI read operations at the Vserver level NA
write_size_hist Histogram of iSCSI write operations at the Vserver level NA

LUN object

Counter name Description Unit
read_ops Read operations per second per sec
write_ops Write operations per second per sec
read_data Read bytes per second b per sec
write_data Write bytes per second b per sec
total_ops Total number of operations on the LUN per sec
avg_latency Average latency for all operations on the LUN millisec
read_align_histo Histogram of WAFL read alignment percent
read_partial_blocks Percentage of reads whose size is not a multiple of the WAFL block size percent
throughput Total data sent and received by the LUN b per sec
unaligned_reads Percentage of WAFL unaligned read operations percent
unaligned_writes Percentage of WAFL unaligned write operations percent
write_align_histo Histogram of WAFL write alignment percent
write_partial_blocks Percentage of write whose size is not a multiple of the WAFL block size percent
avg_read_latency Average latency for read operations on the LUN millisec
avg_write_latency Average latency for write operations on the LUN millisec

LUN object (clustered environments only)

Counter name Description Unit
read_latency_hist Latency histogram for FCP read operations NA
write_latency_hist Latency histogram for FCP read operations NA
other_ops Other operations per second per sec
read_io_len_hist Histogram of LUN read operations NA
write_io_len_hist Histogram of LUN write operations NA

nfsv3 object

Counter name Description Unit
nfsv3_ops Total number of NFSv3 operations per sec
nfsv3_read_ops Total NFSv3 read operations per sec
nfsv3_write_ops Total NFSv3 write operations per sec
nfsv3_latency_hist NFSv3 latency histogram NA
nfsv3_read_latency_hist Histogram of NFSv3 read operations NA
nfsv3_write_latency_hist Histogram of NFSv3 write operations NA

nfsv3 object (7-Mode environments only)

Counter name Description Unit
nfsv3_avg_op_latency Average latency of the NFSv3 operations millisec
nfsv3_read_latency Average latency, for NFSv3 read operations millisec
nfsv3_read_size_histo Histogram of NFSv3 read sizes NA
nfsv3_write_latency Average latency, for NFSv3 write operations millisec
nfsv3_write_size_histo Histogram of NFSv3 write sizes NA

nfsv4 object (7-Mode environments only)

Counter name Description Unit
nfsv4_ops Number of total NFSv4 operations per sec
nfsv4_read_ops Number of NFSv4 read operations per sec
nfsv4_avg_latency Average latency of an NFSv4 request millisec
nfsv4_write_ops Number of NFSv4 write operations per sec
nfsv4_read_size_histo Histogram of NFSv4 read sizes NA
nfsv4_write_size_histo Histogram of NFSv4 write sizes NA
nfsv4_read_latency Average latency, for NFSv4 read operations millisec
nfsv4_write_latency Average latency, for NFSv4 write operations millisec
nfsv4_latency_hist Histogram of NFSv4 operations NA
nfsv4_read_latency_hist Histogram of NFSv4 read operations NA
nfsv4_write_latency_hist Histogram of NFSv4 write operations NA

nfsv4 object (clustered environments only)

Counter name Description Unit
read_avg_latency Average latency of read operations for all the LUNs in the system accessed over NFSv4 millisec
write_avg_latency Average latency of write operations for all the LUNs in the system accessed over NFSv4 millisec
read_latency_hist Latency histogram for NFSv4 read operations NA
write_latency_hist Latency histogram for NFSv4 write operations NA
nfsv4_ops Total number of NFSv4 operations per sec
read_total Total number of NFSv4 read operations per sec
write_total Total number of NFSv4 write operations per sec
nfs4_read_throughput NFSv4 bytes read per second b per sec
nfs4_write_throughput NFSv4 bytes written per second b per sec
nfs4_read_size_histo Histogram of NFSv4 read operations NA
nfs4_write_size_histo Histogram of NFSv4 write operations NA

nfsv4_1 object (clustered environments only)

Counter name Description Unit
read_avg_latency Average latency of read operations for all the LUNs in the system accessed over NFSv4 millisec
write_avg_latency Average latency of write operations for all the LUNs in the system accessed over NFSv4 millisec
read_latency_hist Latency histogram for NFSv4 read operations NA
write_latency_hist Latency histogram for NFSv4 write operations NA
nfsv4_1_ops Total number of NFSv4 operations per sec
read_total Total number of NFSv4 read operations per sec
write_total Total number of NFSv4 write operations per sec
nfs41_read_throughput NFSv4 bytes read per second b per sec
nfs41_write_throughput NFSv4 bytes written per second b per sec
nfs41_read_size_histo Histogram of NFSv4 read operations NA
nfs41_write_size_histo Histogram of NFSv4 write operations NA

Perf object

Counter name Description Unit
data_disk_util_percnt_histo Histogram of data disk utilization percent
ops_per_sec_histo Histogram of operations handled by the appliance percent
parity_disk_util_percnt_histo Histogram of parity disk utilization percent

Priority queue (7-Mode environments only)

Counter name Description Unit
max_user_reads Maximum number of user reads ever outstanding at one time for this queue NA
nvlog_limit Amount of nvlog this queue might use during CP NA
nvlog_limit_full Number of times the nvlog queue limit was hit during CP NA
nvlog_used_max Maximum amount of nvlog this queue used during a CP NA
sys_read_limit Limit on system reads outstanding on this queue NA
sys_sched_total Number of scheduled system requests per sec
sys_weight System request scheduling weight within the priority queue NA
usr_read_limit Limit on user reads outstanding on this queue NA
usr_sched_total Number of scheduling user requests per sec
usr_weight User request scheduling weight within a queue NA

Prescheduled (7-Mode environments only)

Counter name Description Unit
bypass_rate Rate at which guardrail scheduler is bypassed per sec
delayed_io_blocked Number of times delayed messages were found and all queues were I/O blocked NA
delayed_messages Number of times a delayed message was found and pushed NA
preempt_rate Scheduler preemption rate per sec
queued Current messages queued NA
queued_max Maximum scheduling queue depth NA
schedslow Number of times scheduler was found to be slow NA
wake_on_mesg_rate Scheduler wake on message received rate per sec
wake_on_sig_rate Scheduler wake on signal received rate per sec

Processor object

Counter name Description Unit
domain_busy Array of processor time spent in various domains percent
processor_busy Percentage of elapsed time that the processor is executing non-idle processes percent

qtree object (7-Mode environments only)

Note: To minimize negative performance impact on storage systems that Performance Advisor monitors, the default performance views are not automatically generated for its qtree performance objects. However, you can use the following counters to define performance views for individual qtrees.
Counter name Description Unit
nfs_ops NFS operations per second per sec
cifs_ops CIFS operations per second per sec
internal_ops Number of internal operations generated by activities such as SnapMirror and backup to the qtree per sec
total_ops Total operations on the qtree per sec

System object

Counter name Description Unit
net_data_recv Network KB received per second per sec
net_data_sent Network KB sent per second per sec
disk_data_read Disk KB read per second per sec
disk_data_written Disk KB written per second per sec
cpu_busy Percentage of time one or more processors is busy in the system
Note: For storage systems running Data ONTAP 7.2 or earlier, the cpu_busy counter is the amount of time that any one CPU is busy. This results in a value for cpu_busy that is inflated. For storage systems running Data ONTAP 7.2.1 or later, the cpu_busy counter is the greater of either the average CPU utilization or the busiest domain.
percent
avg_processor_busy Average processor utilization across all processors in the system percent
total_processor_busy Total processor utilization of all processors in the system percent
disk_data_read_mbps MB read per second mb per sec
disk_data_written_mbps MB written per second mb per sec
nas_throughput Network throughput in a NAS network kb per sec
disk_throughput Disk throughput in the storage system or cluster kb per sec

System object (7-Mode environments only)

Counter name Description Unit
cifs_ops CIFS operations per second per sec
dafs_ops DAFS operations per second NA
fcp_ops FCP object operations per second per sec
http_ops HTTP operations per second per sec
iscsi_ops iSCSI operations per second per sec
nfs_ops NFS operations per second per sec
load_inbound_mbps Total data received by the system mb per sec
load_outbound_mbps Total data sent by the system mb per sec
load_read_bytes_ratio Ratio of the disk data read and load outbound mbps NA
load_total_mbps Total data sent and received by the system mb per sec
load_write_bytes_ratio Ratio of the disk data write and load inbound mbps NA
nc_urls NetCache URLs served per second NA
pa_total_ops Total operations on the system per sec
pq_max_sys_reads Maximum number of system read requests ever outstanding at one time for the default queue NA
pq_max_user_reads Maximum number of user reads ever outstanding at one time for the default queue NA
pq_nvlog_limit Amount of nvlog default queue might use during CP NA
pq_nvlog_limit_full Number of times the nvlog queue limit was hit during CP for the default queue NA
pq_nvlog_used_max Maximum amount of nvlog queue used during a CP NA
pq_sys_read_limit Limit on system reads outstanding on the default queue NA
pq_sys_sched_total Number of scheduled system requests for the default queue per sec
pq_sys_weight System request scheduling weight within the default queue NA
pq_usr_read_limit Limit on user reads outstanding on the default queue NA
pq_usr_sched_total Number of scheduling user requests for the default queue per sec
pq_usr_weight User request scheduling weight within the default queue NA
san_throughput Total SAN data sent and received by the system kb per sec

Target object (7-Mode environments only)

Counter name Description Unit
queue_full iSCSI queue full responses per second per sec
read_ops Read operations per second per sec
write_ops Write operations per second per sec
other_ops Other operations per second per sec

vFiler object (7-Mode environments only)

Counter name Description Unit
vfiler_cpu_busy Percentage of CPU capacity used per second by hosting storage system that contains the vFiler unit percentage
vfiler_net_data_recv Network data received in kilobytes per second kb per sec
vfiler_net_data_sent Network data sent in kilobytes per second kb per sec
vfiler_read_ops Read operations on the vFiler unit per sec
vfiler_write_ops Write operations on the vFiler unit per sec
vfiler_misc_ops Miscellaneous operations on the vFiler unit per sec
vfiler_read_bytes Data read in kilobytes per second on the vFiler unit kb per sec
vfiler_write_bytes Data written in kilobytes per second on the vFiler unit kb per sec
vfiler_data_transferred Total data transferred by the vFiler unit kb per sec
vfiler_nw_throughput Total network data received and transmitted by the vFiler unit kb per sec
vfiler_total_ops Total operations on the vFiler unit per sec

Volume object

Counter name Description Unit
total_ops Number of operations performed by the volume per sec
avg_latency Average latency for all the operations on the volume millisec
read_ops Number of reads to the volume per sec
read_data Bytes read from the volume b per sec
read_latency Average time for reads from the volume microsec
write_data Bytes written to the volume b per sec
write_latency Average time for writes to the volume microsec
other_ops Number of other operations to the volume per sec
other_latency Average time for other operations to the volume microsec
write_ops Number of writes to the volume per sec
nfs_read_ops Number of NFS reads to the volume per sec
nfs_read_latency Average time for NFS reads from the volume microsec
nfs_write_ops Number of NFS writes to the volume per sec
nfs_write_latency Average time for NFS writes to the volume microsec
nfs_other_ops Number of other NFS operations to the volume per sec
nfs_other_latency Average time for other NFS operations to the volume microsec
cifs_latency Average time for CIFS operations to the volume millisec
cifs_ops CIFS operations on the volume per sec
cifs_read_ops Number of CIFS reads to the volume per sec
cifs_read_latency Average time for CIFS reads to the volume microsec
cifs_write_ops Number of CIFS writes to the volume per sec
cifs_write_latency Average time for CIFS writes to the volume microsec
cifs_other_ops Number of other CIFS operations to the volume per sec
cifs_other_latency Average time for other CIFS operations to the volume microsec
san_read_ops Number of block protocol reads to the volume per sec
san_read_latency Average time for block protocol reads to the volume microsec
san_write_ops Number of block protocol writes to the volume per sec
san_write_latency Average time for block protocol writes to the volume microsec
san_other_ops Number of other block protocol operations to the volume per sec
san_other_latency Average time for other block protocol operations to the volume microsec
flexcache_other_ops Number of other FlexCache operations to the volume per sec
flexcache_read_ops Number of FlexCache read operations from the volume per sec
flexcache_write_ops Number of FlexCache write operations to the volume per sec
nfs_latency Average time for NFS operations to the volume millisec
nfs_ops user operations on the volume per sec
sys_ops sys operations on the volume per sec
throughput Total data sent and received by the volume b per sec
user_ops user operations on the volume per sec

Volume object (7-Mode environments only)

Counter name Description Unit
pq_max_sys_reads Maximum number of system read requests ever outstanding at one time for the default queue for the volume NA
pq_max_user_reads Maximum number of user reads ever outstanding at one time for this queue in the volume NA
pq_nvlog_limit Amount of nvlog this queue might use during CP for the volume NA
pq_nvlog_limit_full Number of times the nvlog queue limit was hit during CP for the volume NA
pq_nvlog_used_max Maximum amount of nvlog this queue might use during CP for the volume NA
pq_sys_read_limit Limit on System reads outstanding on this queue in the volume NA
pq_sys_sched_total Number of scheduling system requests with in the volume per_sec
pq_sys_weight System request scheduling weight within the volume NA
pq_usr_read_limit Limit on user reads outstanding on this queue in the volume NA
pq_usr_sched_total Number of scheduling user requests with in the volume per sec
pq_usr_weight User request scheduling weight within the volume NA

Volume object (clustered environments only)

Counter name Description Unit
flexcache_other_ops Number of other FlexCache operations to the volume per sec
flexcache_read_ops Number of read FlexCache operations to the volume per sec
flexcache_write_ops Number of write FlexCache operations to the volume per sec
san_latency Aggregated SAN latency at the volume level millisec
san_ops SAN operations per second per sec

volume:vserver object (clustered environments only)

Counter name Description Unit
other_ops Aggregated number of other operations to the volume at the Vserver level per sec
read_data Aggregated bytes read from the volume, at the Vserver level b per sec
read_ops Aggregated number of reads to the volume, at the Vserver level per sec
total_ops Aggregated number of operations performed by the volume, at the Vserver level per sec
write_data Aggregated bytes written to the volume, at the Vserver level b per sec
write_ops Aggregated number of writes to the volume, at the Vserver level per sec

volume:node object (clustered environments only)

Counter name Description Unit
other_ops Aggregated number of other operations to the volume at the Vserver level per sec
read_data Aggregated bytes read from the volume, at the Vserver level b per sec
read_ops Aggregated number of reads to the volume, at the Vserver level per sec
total_ops Aggregated number of operations performed by the volume, at the Vserver level per sec
write_data Aggregated bytes written to the volume, at the Vserver level b per sec
write_ops Aggregated number of writes to the volume, at the Vserver level per sec
avg_latency Average latency in microseconds for the WAFL file system to process all the operations on the volume; not including request processing or network communication time microsec
cifs_other_latency Average time for the WAFL file system to process other CIFS operations to the volume; not including CIFS protocol request processing or network communication time which will also be included in client observed CIFS request latency microsec
cifs_other_ops Number of other CIFS operations to the volume per sec
cifs_read_latency Average time for the WAFL file system to process CIFS read requests to the volume; not including CIFS protocol request processing or network communication time which will also be included in client observed CIFS request latency microsec
cifs_read_ops Number of CIFS reads to the volume per sec
cifs_write_latency Average time for the WAFL file system to process CIFS write requests to the volume; not including CIFS protocol request processing or network communication time which will also be included in client observed CIFS request latency microsec
cifs_write_ops Number of CIFS writes to the volume per sec
flexcache_other_ops Number of other FlexCache operations to the volume per sec
flexcache_read_ops Number of FlexCache read operations from the volume per sec
flexcache_write_ops Number of FlexCache write operations to the volume per sec
nfs_other_latency Average time for the WAFL file system to process other NFS operations to the volume; not including NFS protocol request processing or network communication time which will also be included in client observed NFS request latency microsec
nfs_other_ops Number of other NFS operations to the volume per sec
nfs_read_latency Average time for the WAFL file system to process NFS protocol read requests to the volume; not including NFS protocol request processing or network communication time which will also be included in client observed NFS request latency microsec
nfs_read_ops Number of NFS reads to the volume per sec
nfs_write_latency Average time for the WAFL file system to process NFS protocol write requests to the volume; not including NFS protocol request processing or network communication time which will also be included in client observed NFS request latency microsec
nfs_write_ops Number of NFS writes to the volume per sec
other_latency Average latency in microseconds for the WAFL file system to process other operations to the volume; not including request processing or network communication time microsec
read_latency Average latency in microseconds for the WAFL file system to process read request to the volume; not including request processing or network communication time microsec
san_other_latency Average time for the WAFL file system to process other block protocol requests to the volume; not including block protocol request processing or network communication time which will also be included in client observed block protocol request latency microsec
san_other_ops Number of other block protocol operations to the volume per sec
san_read_latency Average time for the WAFL file system to process block protocol read requests to the volume; not including block protocol request processing or network communication time which will also be included in client observed block protocol request latency microsec
san_read_ops Number of block protocol reads to the volume per sec
san_write_latency Average time for the WAFL file system to process block protocol write requests to the volume; including block protocol request processing or network communication time which will also be included in client observed block protocol request latency microsec
san_write_ops Number of block protocol writes to the volume per sec
write_latency Average latency in microseconds for the WAFL file system to process write request to the volume; not including request processing or network communication time microsec