“SSD Does Not Support Discard” Alert When Creating VS

Issue Description

The customer wishes to create a VS, but they are worrying why there is an alert showing “SSD does not support Discard”.

Root Cause

The meaning of the error is the SSD or RAID does not support discard features. Discard mode also known as SSD TRIM.
“SSD TRIM is an Advanced Technology Attachment (ATA) command that enables an operating system to inform a NAND flash solid-state drive (SSD) which data blocks it can erase because they are no longer in use. The use of TRIM can improve the performance of writing data to SSDs and contribute to longer SSD life.” – references from wikipedia.
Remarks: There is no problem use the SSD without discard features, but as time goes on, the read and write performance will decrease.

Solution

Recommend change SSD to an enterprise version which supports discard features.