My HANA shows alerts with the text:Volume (host:port, type , path has trigger asynchronous [read|write] ratio

Hi expert,

I update my HANA to SP7 rev 70.

Then my HANA shows alerts with the text:Volume <n> (host:port, type <type>, path <path> has trigger asynchronous [read|write] ratio.

I searched the SAP Note , and I found SAP Note:1930979.

The SAP Note says the solution that execute the following command :

$ hdbparam --paramset fileio[<path>]. async_write_submit_active=on

$ hdbparam --paramset fileio[<path>]. async_write_submit_blocks=all

$ hdbparam --paramset fileio[<path>]. async_read_submit=on

I executed above command , but the following message was appeared :

Cannot update parameter: parsing parameter update string "fileio[<path>]." failed.HOST:/<current path>>

Please tell me what's happened and what should I do .

Thanks in advance .

Kazuki.