[Info-vax] Do VSI OpenVMS Drivers support Trim for SSD?

[Robert A. Brooks]

On 2/29/2024 1:55 AM, John H. Reinhardt wrote:
> 
> Cross posted from the VSI OpenVMS forum so if you have an answer,
> just post where you are most comfortable. :D
> 
> As a hobbyist, looking to put standard commercial SSD (Samsung EVO,
> WD Red, etc) in my Integrity rx2660. I already have some in my
> AlphaServer DS10's as data disks (unbootable). Just wondering is trim
> is available to help extend the life of the SSD.

VSI VMS does not support the SCSI UNMAP command, which is needed for trimming.

HPE *did* implment the trimming aspect of thin provisioning, but we chose not
to accept those changes into our source pool, because we didn't like the code.

We think the HPE change was done in response to a request by a customer (for which
we suspect the customer paid).  Apparently, the performance was so dreadful that
the customer chose not to use that feature.
  
-- 
		-- Rob