EMC Symmetrix Enhanced Performance Metrics Version 10.3.00P13

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.

• 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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.