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

Black, David david.black at emc.com
Wed Jan 8 06:42:22 PST 2014


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1401080_f.htm">HTML-formatted message</a>

Hi Calvin,
My 0.02:
> 1.	   Will autonomous SMR, host assisted SMR and restricted SMR target
device share using the same Peripheral device type 14h = ZBC - Zoned block
device?
No - IMHO, the new peripheral device type 14h should be an indication that
there are zones in which sequential writes are required.
Software for peripheral device type 0h devices is not going to expect the
errors that result from writes not at the write pointer in such zones.
> 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?
IMHO, the peripheral device type of 14h is sufficient to indicate that.  One
possibility is to require that the HAS_ZBC bit be set to 1 when the
peripheral device type is set to 14h.
Thanks,
--David
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Calvin Chen
Sent: Tuesday, January 07, 2014 5:31 PM
To: Ralph Weber; t10 at t10.org
Subject: RE: SPC-5 and SBC-3 documents posted in support of ZBC
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]
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



More information about the T10 mailing list