答复: copy offload for SMB?

[Liujun (A)]

I think the POPULATE_TOKEN and WRITE_USING_TOKEN is not only bind to SCSI. For example , app asks token and the request is send to filesystem, and then the filesystem is send to the lower block storage. So if the lower filesystem can generate the token by themselves, there is no need send to the block storage. 

-----邮件原件-----
发件人: David Disseldorp [mailto:ddiss at suse.de] 
发送时间: 2013年2月22日 23:36
收件人: Liujun (A)
抄送: Richard Sharpe; samba-technical
主题: Re: copy offload for SMB?

On Fri, 22 Feb 2013 02:40:09 +0000
"Liujun (A)" <liujun09 at huawei.com> wrote:

> I have wrote a test to test offload feature,  the is result is that Windows server 2012  does not support offload read (FSCTL_OFFLOAD_READ).

For the record, I think Windows Server 2k12 support for the new
FSCTL_OFFLOAD_READ/WRITE SMBs is dependent on the underlying storage
subsystem.
It requires an advanced (expensive) storage array that handles
POPULATE_TOKEN and WRITE_USING_TOKEN SCSI commands. See
www.snia.org/sites/default/files2/SDC2011/presentations/monday/NealChristiansen_Win8FileSystemPerformance.pdf

Cheers, David