In order to troubleshoot Performance issue, there are many factors involved and it's not straight forward task. Some of the best practice to follow can be no hardware issue should exist, firmware need to be up to date, Connected system like Servers, SAN Switch all need to be up to date with driver/firmware as well.
Need to check what is the block size set at the Host and depends on that we should check if you want high IOPs or high throughput. Specifically, the smaller the I/O size, the more I/Os per second (IOPS) the SAN can process. However, the corollary to this is a decrease in throughput (as measured in MB/s). Conversely, as I/O size increases, IOPS decreases but throughput increases. When an I/O gets above a certain size, latency also increases as the time required to transport each I/O increases such that the disk itself is no longer the major influence on latency.
Typically, workloads can be defined by four categories—I/O size, reads vs. writes, sequential vs. random, and queue depth.
A typical application usually consists of a mix of reads and writes, and sequential and random.
For example, a Microsoft® SQL Server instance running an OLTP type workload might see disk IO that is 8k size, 80 percent read, and 100 percent random.
A disk backup target on the other hand might see disk IO that is 64k or 256K in size, with 90 percent writes and 100 percent sequential.
The type of workload will affect the results of the performance measurement.
Check this below Customer Advisory and disable "In-band SES" ,
https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c05306564
You can check the below Customer Advisory as well.........in many situations this helped to improve performance,
https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c03473698
Check for ODX settings in Windows system. As per SPOCK it clearly says that Microsoft Offline Data Transfers (ODX) is not supported with MSA2040.
https://h20272.www2.hpe.com/SPOCK/Content/ExportPDFView.aspx?Id=91895&typeId=2
Download the PDF and in page 4 you will get it's clearly mentioned that Microsoft Offline Data Transfers (ODX) is not supported
If you still face performance issue then at the time of performance issue happening capture the below outputs atleast 10 to 15 times along with MSA log and log a HPE support case. They will help you.
# show controller-statistics
# show disk-statistics
# show host-port-statistics
# show vdisk-statistics
# show volume-statistics
One more suggestion, when you log any case or describe your technical issue that time more details required like Server model, what operating system installed, any Switch involved and running with what firmware, in Server all up to date or not specially HBA driver/firmware.......
Hope this helps!
Regards
Subhajit
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[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
From MSA information I see Controller firmware need to update to GL225R003. Please follow this link,
www.hpe.com/storage/MSAFirmware
Drive firmware need to update for Drive model: EG0900JETKB. Please follow the link,
I checked statistics output but they looks fine to me. There is no CPU load or any high latency seen at the time of capture of outputs.
Anyway they are just captured once. First update MSA firmware for all components, update Server all components driver/firmware. Then reboot both MSA and Server. After that check if you face any performance. That time you need to capture following output at least 10 to 15 times by giving 2 minutes gap,
# show controller-statistics
# show disk-statistics
# show host-port-statistics
# show vdisk-statistics
# show volume-statistics
Note: Before you work on any performance issue thumb rule is you need to make sure your hardware is error free and all are up to date with driver/firmware
Hope this helps!
Regards
Subhajit
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I work at HPE
HPE Support Center offers support for your HPE services and products when and how you need it. Get started with HPE Support Center today.
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
Yes you must use SSD to configure read cache and that will help you in improving read latency only
If you have configured your system as per best practice and firmware/driver all up to date in all systems in your setup but still you face performance problem then you need to involve specialist to check your environment
Hope this helps!
Regards
Subhajit
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I work at HPE
HPE Support Center offers support for your HPE services and products when and how you need it. Get started with HPE Support Center today.
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
Can you please check your Storage Pool if any Virtual Disk group exist or not because without any Virtual Disk Group you can't create read cache disk group.
Steps are straight-forward:
First create a Disk-Group for the pool (you can't READ-CACHE without a back end storage)
Then in the SMU (GUI) select _READ-CACHE and select the SSD(s)
Regards
Subhajit
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I work at HPE
HPE Support Center offers support for your HPE services and products when and how you need it. Get started with HPE Support Center today.
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]
As informed you earlier read cache concept works with Virtual Disk group and Virtual Pool only. It's not applicable for Linear vdisk.
Coming to your other query, in order to migrate data from Linear volume to Virtual Volume you need to use Host based application file copy feature. Please follow best practice white paper and refer page no 43 (Scenario 3:)
https://h20195.www2.hpe.com/v2/GetPDF.aspx/4AA4-6892ENW.pdf
Hope this helps!
Regards
Subhajit
If you feel this was helpful please click the KUDOS! thumb below!
I work at HPE
HPE Support Center offers support for your HPE services and products when and how you need it. Get started with HPE Support Center today.
[Any personal opinions expressed are mine, and not official statements on behalf of Hewlett Packard Enterprise]