Update documentation for filename/directory

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 863b0e093b38add8f5c86997e62f8b066f07b1bf..2dee56b524728d4bbf6a1b43773ae5989002f104 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -166,7 +166,9 @@ character. These directories will be assigned equally distributed to job clones
 creates with \fInumjobs\fR as long as they are using generated filenames.
 If specific \fIfilename(s)\fR are set fio will use the first listed directory,
 and thereby matching the  \fIfilename\fR semantic which generates a file each
-clone if not specified, but let all clones use the same if set.
+clone if not specified, but let all clones use the same if set. See
+\fIfilename\fR for considerations regarding escaping certain characters on
+some platforms.
 .TP
 .BI filename \fR=\fPstr
 .B fio
@@ -176,7 +178,12 @@ specify a \fIfilename\fR for each of them to override the default.
 If the I/O engine is file-based, you can specify
 a number of files by separating the names with a `:' character. `\-' is a
 reserved name, meaning stdin or stdout, depending on the read/write direction
-set.
+set. On Windows, disk devices are accessed as \\.\PhysicalDrive0 for the first
+device, \\.\PhysicalDrive1 for the second etc. Note: Windows and FreeBSD
+prevent write access to areas of the disk containing in-use data
+(e.g. filesystems). If the wanted filename does need to include a colon, then
+escape that with a '\' character. For instance, if the filename is
+"/dev/dsk/foo@3,0:c", then you would use filename="/dev/dsk/foo@3,0\:c".
 .TP
 .BI filename_format \fR=\fPstr
 If sharing multiple files between jobs, it is usually necessary to have
@@ -847,8 +854,9 @@ Each job will get a unique CPU from the CPU set.
 .RE
 .P
 \fBshared\fR is the default behaviour, if the option isn't specified. If
-\fBsplit\fR is specified, then fio will error out if there are more jobs
-defined than CPUs given in the set.
+\fBsplit\fR is specified, then fio will assign one cpu per job. If not enough
+CPUs are given for the jobs listed, then fio will roundrobin the CPUs in
+the set.
 .RE
 .P
 .TP