diff options
Diffstat (limited to 'sgp_dd.8')
| -rw-r--r-- | sgp_dd.8 | 11 |
1 files changed, 9 insertions, 2 deletions
@@ -1,4 +1,4 @@ -.TH SGP_DD "8" "January 2007" "sg3_utils\-1.23" SG3_UTILS +.TH SGP_DD "8" "April 2007" "sg3_utils\-1.24" SG3_UTILS .SH NAME sgp_dd \- copies data to and from files and devices. Specialized for devices that understand the SCSI command set. @@ -77,6 +77,7 @@ default is 0 which selects indirect IO. Value of 1 attempts direct IO which, if not available, falls back to indirect IO and notes this at completion. If direct IO is selected and /proc/scsi/sg/allow_dio has the value of 0 then a warning is issued (and indirect IO is performed) +For finer grain control use 'iflag=dio' or 'oflag=dio'. .TP \fBibs\fR=\fIBS\fR if given must be the same as \fIBS\fR given to 'bs=' option. @@ -159,6 +160,12 @@ utility is more sophisticated in such error situations when 'iflag=coe'. When given with 'oflag=', any error reported by a SCSI WRITE command is reported to stderr and the copy continues (as if nothing went wrong). .TP +dio +request the sg device node associated with this flag does direct IO. +If direct IO is not available, falls back to indirect IO and notes +this at completion. If direct IO is selected and /proc/scsi/sg/allow_dio +has the value of 0 then a warning is issued (and indirect IO is performed). +.TP direct causes the O_DIRECT flag to be added to the open of \fIIFILE\fR and/or \fIOFILE\fR. This flag requires some memory alignment on IO. Hence user @@ -193,7 +200,7 @@ Here are some retired options that are still present: coe=0 | 1 continue on error is 0 (off) by default. When it is 1, it is equivalent to 'iflag=coe oflag=coe' described in the FLAGS section -above. Similar to 'conv=noerror' in +above. Similar to 'conv=noerror,sync' in .B dd(1) utility. Default is 0 which implies stop on error. More advanced coe=1 processing on reads is performed by the sg_dd utility. |