SBC-3 - Verify CDB - Unrecovered Read Error
Elliott, Robert (Server Storage)
Elliott at hp.com
Tue Sep 1 16:11:12 PDT 2009
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
That should be covered in (references based on sbc3r19):
Section 4.15.1 Error reporting overview
Table 5 Sense data field usage for direct-access block devices
However, that table restricts itself to:
"Any command that accesses the medium, based on the
Read-Write Error Recovery mode page".
It does not mention the Verify Error Recovery mode page.
The Verify Error Recovery mode page has the same error recovery bits
(EER, PER, DTE, and DCR) as the Read-Write Error Recovery mode page,
and refers to the Read-Write Error Recovery mode page section 6.3.5
table 133 for their definition. Table 133 states that the INFORMATION
field shall contain the LBA of the error.
I recommend that Table 5 be modified to include "or the Verify Error
Recovery mode page" and point to 6.4.6 alongside 6.4.5; a proposal
or letter ballot comment will probably be needed.
Rob Elliott, HP Industry Standard Server Storage
> -----Original Message-----
> From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Mike
> Sent: Tuesday, September 01, 2009 4:50 PM
> To: t10 at t10.org
> Subject: SBC-3 - Verify CDB - Unrecovered Read Error
> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Mike Berhan" <mikeb at bustrace.com>
> Consider a Verify CDB that fails with a sense code 1100h (Unrecovered
> error). The drive returns the "Valid" bit set in the sense data and
> the LBA where the error was detected in the "Information" field of the
> Question is this. In reviewing SBC-3, I cannot find where it
> states that this is the expected / required behavior. The closest I
> find was for the Reassign Blocks CDB which states:
> "If the REASSIGN BLOCKS command failed due to an unexpected unrecovered
> error that would cause the loss of data in a logical block not
> specified in
> the defective LBA list, then the LBA of the logical block with the
> unrecovered read error shall be returned in the INFORMATION field of
> sense data and the VALID bit shall be set to one."
> Have I missed something in SBC-3? Thank you.
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