The Storage Processor (SP) processes all I/Os, host requests, management and maintenance tasks, as well as operations related to replication or migration features.

In Navisphere Analyzer, the statistics for an SP are based on the I/O workload from its attached hosts. It reflects the overall performance of CLARiiON storage system. The following Performance Metrics will be monitored for each CLARiiON storage system.

A LUN is an abstract object whose performance depends on various factors. The primary consideration is whether a host I/O can be satisfied by the cache. A cache hit does not require disk access; a cache miss requires one or more disk accesses to complete the data request.

As the slowest devices in a storage system, disk drives are often responsible for performance-related issues. Therefore, we recommend that you pay close attention to disk drives when analyzing performance problems.

SP performance metrics

Utilization (%)

The percentage of time during which the SP is servicing any request.

Total Throughput (I/O/sec)

The average number of host requests that are passed through the SP per second, including both read and write requests.


Read Throughput (I/O/sec)

The average number of host read requests that are passed through the SP per second.

Write Throughput (I/O/sec)

The average number of host write requests that are passed through the SP per second.

Read Bandwidth (MB/s)

The average amount of host read data in Mbytes that is passed through the SP per second.

Write Bandwidth (MB/s)

The average amount of host write data in Mbytes that is passed through the SP per second.

LUN performance metrics

Response Time (ms)

The average time, in milliseconds, that a request to a LUN is outstanding, including waiting time.

Total Throughput (I/O/sec)

The average number of host requests that are passed through the LUN per second, including both read and write requests.

Read Throughput (I/O/sec)

The average number of host read requests passed through the LUN per second.

Write Throughput (I/O/sec)

The average number of host write requests passed through the LUN per second.

Read Bandwidth (MB/s)

The average amount of host read data in Mbytes that is passed through the LUN per second.

Write Bandwidth (MB/s)

The average amount of host write data in Mbytes that is passed through the LUN per second.

Average Busy Queue Length

The average number of outstanding requests when the LUN was busy. This does not include idle time.

Utilization (%)

The fraction of an observation period during which a LUN has any outstanding requests.

DISK performance metrics

Utilization (%)

The percentage of time that the disk is servicing requests.

Response Time (ms)

The average time, in milliseconds, that it takes for one request to pass through the disk, including any waiting time.

Total Throughput (I/O/sec)

The average number of requests to the disk on a per second basis. Total throughput includes both read and write requests.

Read Throughput (I/O/sec)

The average number of read requests to the disk per second.

Write Throughput (I/O/sec)

The average number of write requests to the disk per second.

Read Bandwidth (MB/s)

The average amount of data read from the disk in Mbytes per second.

Write Bandwidth (MB/s)

The average amount of data written to the disk in Mbytes per second.

Average Busy Queue Length

The average number of requests waiting at a busy disk to be serviced,

including the request that is currently in service.

CLARiiON SP, LUN and DISK performance data is retrieved and processed daily. Raw performance data is kept for a longer term, i.e. 180 days, and CLARiiON performance reports are kept indefinitely for performance trend analysis.


9 Comments:

  1. Anonymous Says:
  2. Hi,

    Thanks for the informative post. I would like to know if there is any statistics available for 'Disk Group' level.

    ps: am a newbie to clarion, if my question is not relevant please explain the reason.

    Thank you,
    Leo

  3. vin1s4u Says:
  4. Nice post... but one doubt, don't they provide any stats for disk groups.

  5. dec Says:
  6. Clariions can come with Analyzers where you can see almost everything happening on the box.

  7. Haresh Says:
  8. Hi,

    Very useful information. I would like to know if there is any tool which generates a complete performance report with graphs?

  9. Anonymous Says:
  10. i need some information on LUN masking please let me know the procedure in SAN side not in the switch side..

    thanks
    Karthik

  11. Maya Says:
  12. Hi,

    I've a question. In EMC NaviCli utility the SP utilization value is always constant. Is it a known issue or something else that I need to configure in my setup.

    Thanks

  13. Anonymous Says:
  14. Hello Karthik,

    Have you got the information about LUN masking? If not, please do post and will try to get answers for you.

    Regards,
    Nara

  15. Anonymous Says:
  16. Iam facing same issue - SP utilization is always constant while other metrics such as requests is refreshing..Can someone pls help if you got n solution..

    Regards
    Srihari

  17. mahendra Says:
  18. THANK YOU VERY MUCH :)
    NICE WORK

    REGARDS,
    MAHENDRA

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