Re: thin provisioned LUN support

Theodore Tso
2008-11-07T19:35:25Z

On Fri, Nov 07, 2008 at 01:41:35PM -0500, Ric Wheeler wrote:
>> Will we be able to query the device and find out its TRIM/UNMAP
>> alignment requirements? There is also a balanace between performance
>> (at least if the concern is sending too many separate TRIM commands)
>> and giving the SSD more flexibility in its wear-leveling allocation
>> decisions by sending TRIM commands sooner rather than later.
>>
>
> T10 is still working on the proposal for how to display unmap related
> information for SCSI, so we don't even have a consistent way to find
> this out today for this population.

Yeah, I know, the rhetorical question was mostly addressed at David
Black. :-)

> Not sure what is possible for the ATA devices,

I thought ATA didn't have any TRIM alignment requirements, and it's
T10 that wants to add it to the SCSI side?

- Ted