Add hint on being root for EPERM and shmhuge error

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 497db5393eba0233dbba3f3a06b0beb63ed17d42..10b1768ce42e9eb712f77202549c0b76795695ad 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -45,7 +45,7 @@ Print help information for \fIcommand\fR.  May be `all' for all commands.
 .TP
 .BI \-\-debug \fR=\fPtype
 Enable verbose tracing of various fio actions. May be `all' for all types
-or individual types seperated by a comma (eg --debug=io,file). `help' will
+or individual types seperated by a comma (eg \-\-debug=io,file). `help' will
 list all available tracing options.
 .TP
 .B \-\-help
@@ -78,9 +78,10 @@ String: a sequence of alphanumeric characters.
 .TP
 .I int
 SI integer: a whole number, possibly containing a suffix denoting the base unit
-of the value.  Accepted suffixes are `k', 'M' and 'G', denoting kilo (1024),
-mega (1024*1024) and giga (1024*1024*1024) respectively. If prefixed with '0x',
-the value is assumed to be base 16 (hexadecimal).
+of the value.  Accepted suffixes are `k', 'M', 'G', 'T', and 'P', denoting
+kilo (1024), mega (1024^2), giga (1024^3), tera (1024^4), and peta (1024^5)
+respectively. The suffix is not case sensitive. If prefixed with '0x', the
+value is assumed to be base 16 (hexadecimal).
 .TP
 .I bool
 Boolean: a true or false value. `0' denotes false, `1' denotes true.
@@ -570,7 +571,7 @@ values are:
 .RS
 .RS
 .TP
-.B md5 crc16 crc32 crc64 crc7 sha256 sha512
+.B md5 crc16 crc32 crc32c crc32c-intel crc64 crc7 sha256 sha512 sha1
 Store appropriate checksum in the header of each block.
 .TP
 .B meta
@@ -585,6 +586,12 @@ than 32-bits.
 .B null
 Pretend to verify.  Used for testing internals.
 .RE
+
+This option can be used for repeated burn-in tests of a system to make sure
+that the written data is also correctly read back. If the data direction given
+is a read or random read, fio will assume that it should verify a previously
+written file. If the data direction includes any form of write, the verify will
+be of the newly written data.
 .RE
 .TP
 .BI verify_sort \fR=\fPbool