Dell NVMe issues

[Steven Hartland]

On 06/10/2015 19:03, Jim Harris wrote:
>
>
> On Tue, Oct 6, 2015 at 9:42 AM, Steven Hartland 
> <killing at multiplay.co.uk <mailto:killing at multiplay.co.uk>> wrote:
>
>     Also looks like nvme exposes a timeout_period sysctl you could try
>     increasing that as it could be too small for a full disk TRIM.
>
>
>     Under CAM SCSI da support we have a delete_max which limits the
>     max single request size for a delete it may be we need something
>     similar for nvme as well to prevent this as it should still be
>     chunking the deletes to ensure this sort of thing doesn't happen.
>
>
> See attached.  Sean - can you try this patch with TRIM re-enabled in ZFS?
>
> I would be curious if TRIM passes without this patch if you increase 
> the timeout_period as suggested.
>
> -Jim
>
>
Interesting does the nvme spec not provide information from the device 
as to what its optimal / max deallocate request size should be like the 
ATA spec exposes?

     Regards
     Steve