SPC-5 and SBC-3 documents posted in support of ZBC

Ralph Weber Ralph.Weber at wdc.com
Wed Jan 8 07:51:58 PST 2014


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1401082_f.htm">HTML-formatted message</a>

Calvin,
Here is what I think the answer to your question(s) looks like.
Device type
HAS_ZBC
Autonomous (aka Transparent) SMR
SBC
0
Host Assisted SMR
SBC
1
Restricted SMR
ZBC
???
Of course, there is a high probability that I am wrong.
All the best,
.Ralph
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Gerry Houlder
Sent: Wednesday, January 08, 2014 8:52 AM
To: Calvin Chen
Cc: t10 at t10.org
Subject: Re: SPC-5 and SBC-3 documents posted in support of ZBC
Current plan is autonomous drives and host assisted SMR drives will have
direct access device type while restricted SMR will have the new ZBC device
type. A field in the block device characteristics VPD page will allow
differentiation of host assisted versus restricted SMR types.
On Tue, Jan 7, 2014 at 4:30 PM, Calvin Chen
<cachen at microsoft.com> wrote:
Hi Ralph,
I have couple questions regarding the proposed SMR device identification
spec.
1.	 Will autonomous SMR, host assisted SMR and restricted SMR target
device share using the same Peripheral device type 14h = ZBC - Zoned block
device?
2.	 If a storage target device has the HAS_ZBC bit set to 0 and
Peripheral device type 14h = ZBC, does it mean the storage target device is a
restricted SMR drive?
Thanks
Calvin
From: owner-t10 at t10.org<mailto:owner-t10 at t10.org>
[mailto:owner-t10 at t10.org<mailto:owner-t10 at t10.org>] On Behalf Of Ralph Weber
Sent: Monday, January 6, 2014 6:34 PM
To: t10 at t10.org<mailto:t10 at t10.org>
Subject: SPC-5 and SBC-3 documents posted in support of ZBC
As requested by today's ZBC call, two documents are being posted for January
CAP consideration.
SPC-5: Assign device type code to ZBC
http://www.t10.org/cgi-bin/ac.pl?t=d&f=14-017r0.pdf
SBC-4: Update Block Device Characteristics VPD page for ZBC
http://www.t10.org/cgi-bin/ac.pl?t=d&f=14-018r0.pdf
See you in Irvine,
.Ralph



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