Hello 5X5CX62,

Are you reffering to data progression?  If that is the case, then data progression is all ways running so that it can move the data between your tiers.   Here is the link to the administrator guide and if you look on page 63 it explains more about data progression. https://topics-cdn.dell.com/pdf/storage-sc2000_administrator-guide_en-us.pdf

Please let us know if you have any other questions.

Hello 5X5CX62,
The Raid Scrub process runs continuously in the background checking the blocks of data, and also verifying that there is no issues with the Raid extents. This is normal and should not cause any issues during normal processes. Are you seeing some performance issues that you feel the Raid Scrub is causing? Or are you questioning what the process is and why it is running?

For Unisphere refer to page 27 of Unisphere and Unisphere Central 2018 R1 Administrator’s Guide under How Data Progression Works:
https://topics-cdn.dell.com/pdf/dell-storage-manager_administrator-guide6_en-us.pdf

NOTE: With SCv2000 series controllers, Data Progression moves data between RAID 10 and RAID 5/6 and restripes RAID, but does not move data between storage tiers.

Hello Bob,

Thanks for your reply. It appeared that raid scrub is producing pretty sizable amount of IOPS on backend per Unisphere perf charts. However, given the fact that our R730 with 8*8T drives finishes scrub fairly quickly and yet at least 50% of the time I log on to the SCV2080, RAID scrub was runing, I am pretty curious if there's a difference in strategy that caused the difference. I also remember SCOS 7.3 lowered the frequency from once per week to once per month and therefore it's pretty bizzare I am able to find it scrubbing most of the time.

Wade

Hello Wade,

I would recommend to call in to support to have them check the logs, and compare this to the the IO Usage during the times Raid Scrub ran. It is also possible that you are seeing a false positive in the IO Usage graphs. Support can log in to your system and assist you in looking in to this.

Hello Kavurisravan,

To start space reclamation on the PowerMax 950F, follow these steps:

1.       Select the Storage System: Access the management interface for your PowerMax 950F.

2.       Navigate to Volumes: Go to STORAGE > Volumes.

3.       Choose Volume Type: Select the appropriate tab for the volume type you wish to reclaim.

4.       Start Space Reclamation:

·  Select one or more volumes.

·  Click on Reclaim to open the Start Allocate/Free/Reclaim dialog box.

·  Choose Start Allocate/Free/ and then select Reclaim Volumes to reclaim unwritten tracks and those written completely with zeros. This option is available on systems running Enginuity 5876 or higher, or HYPERMAX OS 5977 or higher.

·  Optionally, you can select Reclaim persistent capacity to reclaim tracks that are unwritten or zero-based, even if marked as persistent.

To stop space reclamation, select one or more volumes, click Reclaim, and follow the prompts to stop the operation.

For more detailed information on thin pools and thin provisioning concepts, refer to the relevant procedures in the PowerMax documentation.

Here is also a link to Unisphere for PowerMax Version 9.0.0 Online Help guide which has some additional assistance for thin volumes. https://dl.dell.com/content/docu88874_unisphere-for-powermax-9-0-0-online-help.pdf?language=en-us