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

[John H. Reinhardt]

On 2/29/2024 9:36 AM, Robert A. Brooks wrote:
> 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.
> 

Thanks Rob! I didn't think it had.

> 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.
> 

That's too bad  Now that you mention this it does sound familiar, but my search didn't find it anywhere.

-- 
John H. Reinhardt