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

[Single Stage to Orbit]

On Thu, 2024-02-29 at 10:36 -0500, 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.
> 
> 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.

All that's needed is a simple utility to run once a day, or a week or a
month to free up deleted data blocks on the devices. Linux has an
utility 'fstrim' that does this. I suggest implementing something like
this might be better rather than the half-assed solution that HP
dreamed up.
-- 
Tactical Nuclear Kittens