man sg_copy_results (8): send SCSI RECEIVE COPY RESULTS command (XCOPY related)

SYNOPSIS

sg_copy_results [--failed|--params|--receive|--status] [--help] [--hex] [--list_id=ID] [--readonly] [--verbose] [--version] [--xfer_len=BTL] DEVICE

DESCRIPTION

This utility is designed to query the status of the SCSI Extended Copy (XCOPY) facility (see SPC-3 revision 23 sections 6.3 and 6.17), present in some modern storage arrays. This utility sends a SCSI RECEIVE COPY RESULTS command to the given DEVICE and displays the response.

During the draft stages of SPC-4 the T10 committee has expanded the XCOPY command so that it now has two variants: "LID1" (for a List Identifier length of 1 byte) and "LID4" (for a List Identifier length of 4 bytes). This utility supports the older, LID1 variant which is also found in SPC-3 and earlier. While the LID1 variant in SPC-4 is command level (binary) compatible with XCOPY as defined in SPC-3, some of the command naming has changed. This utility uses the older, SPC-3 XCOPY names.

The command has four distinct modes of operation, distinguished by the service action field:

COPY STATUS [SPC-4: RECEIVE COPY STATUS(LID1)]: Displays the current status of the EXTENDED COPY command identified by the list id field.
RECEIVE DATA [SPC-4: RECEIVE COPY DATA(LID1)]: Return the held data read by the EXTENDED COPY command identified by the list id field. This option is only meaningful if the respective segment descriptor are supported.
OPERATING PARAMETERS [SPC-4: RECEIVE COPY OPERATING PARAMETERS]: Return copy manager operating parameters. This option is also useful to determine if the SCSI Extended Copy facility is supported.
FAILED SEGMENT DETAILS [SPC-4: RECEIVE COPY FAILURE DETAILS(LID1)]: Return copy target device sense data and other information about any failed segments.

OPTIONS

Arguments to long options are mandatory for short options as well.

-f, --failed: sets the service action field to FAILED SEGMENT DETAILS [4].
-h, --help: output the usage message then exit.
-H, --hex: prints out the response buffer in hex.
-l, --list_id=ID: sets the list identifier field to ID (default: 0).
-p, --params: sets the service action field to OPERATING PARAMETERS [3]. This is the default.
-R, --readonly: open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag). The default is to open it read-write.
-r, --receive: sets the service action field to RECEIVE DATA [1].
-s, --status: sets the service action field to COPY STATUS [0].
-v, --verbose: increase the level of verbosity, (i.e. debug output).
-V, --version: print the version string and then exit.
-x, --xfer_len=BTL: sets the allocation length field to BTL. It is the byte transfer length and is the maximum (byte) size of the response. BTL must be less than 10000 and defaults to 520.

NOTES

Decoding of RECEIVE DATA service action is not implemented.

In a similar way the functionality of sg_xcopy has been ported to the more general ddpt utility (and package), the functionality of this utility has been ported to the ddptctl utility.

EXAMPLES

Query the operating parameters for a device:

# sg_copy_results -p /dev/sdo
Receive copy results (report operating parameters):
    Supports no list identifier: no
    Maximum target descriptor count: 2
    Maximum segment descriptor count: 1
    Maximum descriptor list length: 92 bytes
    Maximum segment length: 33553920 bytes
    Inline data not supported
    Held data limit: 0 bytes
    Maximum stream device transfer size: 0 bytes
    Total concurrent copies: 0
    Maximum concurrent copies: 255
    Data segment granularity: 512 bytes
    Inline data granularity: 1 bytes
    Held data granularity: 1 bytes
    Implemented descriptor list:
        Segment descriptor 0x02: Copy from block device to block device
        Target descriptor 0xe4: Identification descriptor

EXIT STATUS

The exit status of sg_copy_results is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHORS

Written by Douglas Gilbert.

REPORTING BUGS

Report bugs to <dgilbert at interlog dot com>.