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Command / method to check disk activities

Hi,

 

I am using NetApp FAS2552. (14 disk each of 1TB and it has 2 contollers)
I am not sure and wanted to know, 
1] How can I check stripe size?
2] How can see where is my getting stored?
3] What is cache of thos storage subsystem?
4] Can I monitor fragmentation of disks?

Thanks in Advance.

Re: Command / method to check disk activities

Hi Chetan, 

 

Thank you for writing to NetApp Community.

 

 

1] How can I check stripe size?

 

NetApp stripe size is 4KB irrespective of number of disks or applicartion you are using....

 

Refer to this TR, Although this is a old one but it has good explanation http://www.netapp.com/us/media/tr-3001.pdf

 

 

2] How can see where is my getting stored?

 

Actually you cannot have visibility of actual data from the NetApp but it can be seen only on host side on SHARES, LUN etc...

 

 

3] What is cache of those storage subsystem?

 

It Depends if you are FAS2552 is a single or Dual controller 2GB or 4GB respectively and on top of it you can have FLASH CACHE added

 

 

4] Can I monitor fragmentation of disks?

 

Nope you don't have visibility to monitor the fragmentation.

 

 

Thanks,

Nayab

 

 

Re: Command / method to check disk activities

"It Depends if you are FAS2552 is a single or Dual controller 2GB or 4GB respectively and on top of it you can have FLASH CACHE added"

 

FlashCache is not an option on the FAS2500 series.

 

There is a deep diagnostic command to display individual disk usage - command is statit and is detailed here - https://kb.netapp.com/support/s/article/ka31A0000000xBdQAI/how-to-assess-disk-level-response-times?language=en_US but I would caution you on making too many decisions based on its output. It is intended to determine if some disks are more heavily utilised than others, but the core of the "write anyway file layout" of ONTAP is that data is not rewritten on the same block it was originally on. 

 

Hope this helps!