EMC Symmetrix Enhanced Performance Metrics
  
Version 10.3.00P13
EMC Symmetrix Enhanced Performance Metrics
In addition to LUN and Port performance metrics that can be collected from EMC Symmetrix arrays, data collection gathers other performance metrics by accessing storage devices via the EMC Unisphere REST API. These enhanced performance metrics are retrieved by a Data Collector that was developed using the APTARE SDK. The metrics can be accessed in the Dynamic Template Designer and the SQL Template Designer to generate report templates.
Unisphere records performance metrics in 5-minute intervals and this interval is not configurable. APTARE IT Analytics reporting assumes that this is a fixed interval.
The APTARE IT Analytics Data Collector captures EMC Symmetrix performance metrics every 15 minutes, by default. This interval is configurable. Whatever interval length is used (15-minute default or customer-specified), APTARE IT Analytics captures and exposes whatever 5-minute intervals were exposed by Unisphere since the last successful completion (maximum last 8 hours). On the first successful data collection, APTARE IT Analytics captures and exposes 8 hours of historical 5-minute intervals.
APTARE IT Analytics reports typically group the 5-minute intervals into broader time intervals, such as hours, days, or weeks. In these cases, reports display Symmetrix performance values (I/Os, MBps, and Latency) as an average, calculated from the 5-minute interval records that are provided by Unisphere.
The following additional EMC Symmetrix performance metrics are collected from the Unisphere API:
EMC Symmetrix Array Performance
EMC Symmetrix Back-end Director Performance
EMC Symmetrix Front-end Port Performance
EMC Symmetrix Storage Group Performance
EMC Symmetrix Database Performance
EMC Symmetrix Disk Group Performance
EMC Symmetrix Disk Performance
EMC Symmetrix Device Groups Performance
EMC Symmetrix Disk by Technology Performance
EMC Symmetrix Storage Tier Performance
EMC Symmetrix Thin Tier Performance
EMC Symmetrix Thin Pool Performance
Create Enhanced EMC Symmetrix Performance Report Templates
These enhanced EMC Symmetrix performance metrics are retrieved by a Data Collector that was developed using the APTARE IT Analytics SDK. The metrics can be accessed in the Dynamic Template Designer and the SQL Template Designer to generate report templates.
The database views that support these additional metrics have an SDK prefix for the database view names. For example, in the Dynamic Template Designer, you will see SDK_ESYM_THIN_TIER_PERF. In the SQL Template Designer, you will see sdk_v_esym_thin_tier_perf.
When developing a report template in the Dynamic Template Designer, select a Product of EMC Symmetrix and search fields for SDK to list fields that are relevant for reporting performance metrics.
EMC Symmetrix Array Performance
Metric
Description
Host IOs
The number of host I/O operations per second by all Symmetrix volumes. This includes random and sequential reads, and writes to the volume.
Host MBs
The total requests per second (from all front-end directors) that were satisfied from cache.
Host MBs Read
The number of MB per second read by all Symmetrix volumes.
Host MBs Written
The number of MB per second written by all Symmetrix volumes.
BE Reqs
The number of a read or write data transfers between cache and the back-end director.
WP Count
The number of system cache slots that are write-pending.
Percent Cache WP
The % of system cache that is write-pending.
Avg Fall Thru Time
The average time it takes a cache slot in LRU0 to be freed up. This value represents the average time from the first use of the contents to its reuse by another address.
EMC Symmetrix Back-end Director Performance
Metric
Description
Percent Busy
The % of time that the director is busy.
IOs
The number of I/O commands accessing the disk.
Reqs
The number of read/write requests between the cache and the director.
MBs Read
The read transfers per second, in MB.
MBs Written
The write transfers per second, in MB.
Percent Non IO Busy
The total % of time that the directory is busy serving non-I/O requests.
EMC Symmetrix Front-end Director Performance
Metric
Description
Percent Busy
The % of time that the director is busy.
Host IOs
The number of host I/O operations per second for director data transfers.
Host MBs
The size of the data transfer from the host in MB per second.
Reqs
The data transfer read/write requests between the director and the cache. An I/O may require multiple requests depending on I/O size, alignment, or both. The requests rate should be either equal to or greater than the I/O rate.
Read Response Time
A calculated average response time for reads.
Write Response Time
A calculated average response time for writes.
EMC Symmetrix Front-end Port Performance
Metric
Description
IOs
The number of I/O commands accessing the disk.
MBs
The total read and write I/Os per second in MBs.
Speed GBs
The gigabits per second through the port.
Percent Busy
The % of time the port is busy
EMC Symmetrix Storage Group Performance
Metric
Description
Host MBs
Cumulative number of host MB per second reads/writes for the storage group.
Host MB Reads
Cumulative number of host MB per second reads by the storage group.
Host MB Written
Cumulative number of host MB per second written by the storage group.
Read Response Time
The average time taken by the Symmetrix array to serve one read I/O for this group.
Write Response Time
The average time taken by the Symmetrix array to serve one write I/O for this group.
Read Miss Response Time
The average time taken by the Symmetrix array to serve one read miss I/O (not found in cache) for this group.
Write Miss Response Time
The average time taken by the Symmetrix array to serve one write miss I/O (not found in cache) for this group.
Percent Hit
The % of I/O operations that were satisfied immediately from cache.
Allocated Capacity
The capacity of the storage group, in GB.
EMC Symmetrix Database Performance
Metric
Description
Host IOs
The number of host operations performed each second by the group.
Host Reads
The number of host read operations performed each second by the group.
Host Writes
The number of host write operations performed each second by the group.
Read Response Time
The average time taken by the Symmetrix array to serve one read I/O for this group.
Write Response Time
The average time taken by the Symmetrix array to serve one write I/O for this group.
Percent Hit
The % of I/O operations that were satisfied immediately from cache.
Response Time
The average response time for the reads and writes.
Allocated Capacity
The capacity of the storage group, in GB.
EMC Symmetrix Disk Group Performance
Metric
Description
Percent Busy
The % of time that the disk group is busy serving I/O requests.
Total SCSI Commands
The total number of commands performed by the disk group each second: read, write, skip mask, verify, XOR write, and XOR write-read.
Disk Reads
The number of reads per second for the disk group.
Disk Writes
The number of writes per second for the disk group.
MB Read
The read throughput of the disk group, in MB per second.
MB Written
The write throughput of the disk group, in MB per second.
Read Response Time
The average time taken by the disk group to serve one read command.
Write Response Time
The average time taken by the disk group to serve one write command.
MBs
The total number of MB per second for the disk group.
IOs
The total number of read and write I/Os per second for the disk group.
Total Capacity
Total capacity of all the disks in the disk group.
Used Capacity
Total capacity allocated from all the disks in the disk group.
EMC Symmetrix Disk Performance
Metric
Description
Percent Busy
The % of time that the disk group is busy serving I/O requests.
Avg Queue Depth
Calculated value: Accumulated queue depth/total SCSI commands per second.
Total SCSI Commands
Total number of commands performed by the disk each second: read, write, skip mask, verify, XOR write, and XOR write-read.
Disk Reads
The number of reads per second for the disk.
 
Disk Writes
The number of writes per second for the disk.
MB Read
The read throughput of the disk, in MB per second.
MB Written
The write throughput of the disk, in MB per second.
Read Response Time
The average time taken by the disk to serve one read command.
Write Response Time
The average time taken by the disk to serve one write command.
IOs
The total number of read and write I/Os per second for the disk.
EMC Symmetrix Device Groups Performance
Metric
Description
Host Reads
The number of host read operations performed each second by the group.
Host Writes
The number of host write operations performed each second by the group.
Host Read Hits
The number of host read operations performed each second by the group that were immediately satisfied from cache.
Host Write Hits
The number of host write operations performed each second by the group that were immediately satisfied from cache.
Host Read Misses
The number of host read operations performed each second by the group that were not satisfied from cache.
Host Write Misses
The number of host write operations performed each second by the group that were not satisfied from cache.
Host MB Reads
The cumulative number of host reads by the group, in MB per second.
Host MB Written
The cumulative number of host writes by the group, in MB per second.
Read Response Time
The average time taken by the Symmetrix array to serve one read I/O operation for this group.
Write Response Time
The average time taken by the Symmetrix array to serve one write I/O operation for this group.
WP Count
The number of tracks that are write-pending for the group.
EMC Symmetrix Disk by Technology Performance
Metric
Description
Read Response Time
The average time taken by the disk to serve one read I/O operation.
Write Response Time
The average time taken by the disk to serve one write I/O operation.
Percent Busy
The % of time that the disk is busy serving I/O requests.
Total Capacity
The total capacity of the disk, in GB.
Total SCSI Commands
The total number of commands performed by the disk each second: read, write, skip mask, verify, XOR write, and XOR write-read.
Used Capacity
Total used capacity of the disk, in GB.
Reads
The number of disk reads.
Writes
The number of disk writes.
EMC Symmetrix Storage Tier Performance
Metric
Description
Percent Disk Busy
The % of time that the disk is busy serving I/O requests.
Total SCSI Commands
The total number of commands performed by the disk group each second: read, write, skip mask, verify, XOR write, and XOR write-read.
Host Reads
The number of host reads performed each second by the disk.
Host Writes
The number of host writes performed each second by the disk.
MB Read
The read throughput of the disk, in MB per second.
MB Written
The write throughput of the disk, in MB per second.
Read Response Time
The average time taken by the disk to serve one read I/O operation .
Write Response Time
The average time taken by the disk to serve one write I/O operation .
Total Disk Capacity
Total capacity of the disk, in GB.
Used Disk Capacity
Total used capacity of the disk, in GB.
EMC Symmetrix Thin Tier Performance
Metric
Description
Host Reads
The average time it took the disk to serve one read command.
Host Writes
The average time it took the disk to serve one write command.
Host Hits
The number of host read/write operations performed each second by the group that were immediately satisfied from cache.
Host MBs
Cumulative number of host read/writes per second by the group, in MB per second.
Read Response Time
The average time taken by the array to serve one read I/O operation.
Write Response Time
The average time taken by the array to serve one write I/O operation.
Total Pool Capacity
Total physical capacity of the pool of storage. This is derived from the sum of capacities of data devices (enabled or disabled) in the pool.
Enabled Pool Capacity
The some of all the enabled data devices in the pool.
Used Pool Capacity
The amount of capacity that has been used from the bound pool.
Allocated Pool Capacity
From the enabled capacity, this is the amount of capacity that is bound to thin devices.
EMC Symmetrix Thin Pool Performance
Metric
Description
Host Reads
The average time it took the disk to serve one read command.
 
Host Writes
The average time it took the disk to serve one write command.
Host Hits
The number of host read/write operations performed each second by the group that were immediately satisfied from cache.
Host MBs
Cumulative number of host read/writes per second by the group, in MB per second.
Read Response Time
The average time taken by the array to serve one read I/O operation.
Write Response Time
The average time taken by the array to serve one write I/O operation
Total Pool Capacity
Total physical capacity of the pool of storage. This is derived from the sum of capacities of data devices (enabled or disabled) in the pool.
Enabled Pool Capacity
The some of all the enabled data devices in the pool.
Used Pool Capacity
The amount of capacity that has been used from the bound pool.
Allocated Pool Capacity
From the enabled capacity, this is the amount of capacity that is bound to thin devices.