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diff --git a/doc/sg_rdac.8 b/doc/sg_rdac.8
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index 8e3d27a..cac0776 100644
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--- a/doc/sg_rdac.8
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+++ b/doc/sg_rdac.8
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@@ -19,6 +19,8 @@ Transfer all (visible) devices
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\fB\-f\fR=\fILUN\fR
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Transfer the device identified by \fILUN\fR. This command will only work
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if the controller supports 'Dual Active Mode' (aka active/active mode).
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+\fILUN\fR is a decimal number which cannot exceed 31 when the \fI\-6\fR
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+option is given, otherwise is cannot exceed 255.
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.TP
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\fB\-v\fR
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be verbose
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@@ -33,7 +35,7 @@ Written by Hannes Reinecke <hare at suse dot com>, based on sg_emc_trespass.
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.SH "REPORTING BUGS"
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Report bugs to <dgilbert at interlog dot com>.
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.SH COPYRIGHT
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-Copyright \(co 2006\-2012 Hannes Reinecke, Douglas Gilbert.
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+Copyright \(co 2006\-2016 Hannes Reinecke, Douglas Gilbert.
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.br
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This software is distributed under the GPL version 2. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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diff --git a/src/sg_rdac.c b/src/sg_rdac.c
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index ea243a2..63cfe46 100644
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--- a/src/sg_rdac.c
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+++ b/src/sg_rdac.c
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@@ -188,9 +188,16 @@ static int fail_this_path(int fd, int lun, int use_6_byte)
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struct rdac_page_common *rdac_common = NULL;
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int res;
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- if (use_6_byte && lun > 32) {
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- fprintf(stderr, "must use 10 byte cdb to fail luns over 32\n");
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- return -1;
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+ if (use_6_byte) {
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+ if (lun > 31) {
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+ fprintf(stderr, "must use 10 byte cdb to fail luns over 31\n");
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+ return -1;
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+ }
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+ } else { /* 10 byte cdb case */
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+ if (lun > 255) {
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+ fprintf(stderr, "lun cannot exceed 255\n");
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+ return -1;
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+ }
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}
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memset(fail_paths_pg, 0, 308);
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