Tell fio to terminate processing after the specified period of time. It
can be quite hard to determine for how long a specified job will run, so
this parameter is handy to cap the total runtime to a given time. When
-the unit is omitted, the value is intepreted in seconds.
+the unit is omitted, the value is interpreted in seconds.
.TP
.BI time_based
If set, fio will run for the duration of the \fBruntime\fR specified
.RE
.TP
.BI fadvise_hint \fR=\fPstr
-Use \fBposix_fadvise\fR\|(2) to advise the kernel what I/O patterns
-are likely to be issued. Accepted values are:
+Use \fBposix_fadvise\fR\|(2) or \fBposix_madvise\fR\|(2) to advise the kernel
+what I/O patterns are likely to be issued. Accepted values are:
.RS
.RS
.TP
ioctl, or if the target is an sg character device we use
\fBread\fR\|(2) and \fBwrite\fR\|(2) for asynchronous
I/O. Requires \fBfilename\fR option to specify either block or
-character devices.
+character devices. The sg engine includes engine specific options.
.TP
.B null
Doesn't transfer any data, just pretends to. This is mainly used to
at least one non\-cpuio job.
.TP
.B guasi
-The GUASI I/O engine is the Generic Userspace Asyncronous Syscall
+The GUASI I/O engine is the Generic Userspace Asynchronous Syscall
Interface approach to async I/O. See \fIhttp://www.xmailserver.org/guasi\-lib.html\fR
for more info on GUASI.
.TP
I/O engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate
defragment activity in request to DDIR_WRITE event.
.TP
+.B rados
+I/O engine supporting direct access to Ceph Reliable Autonomic Distributed
+Object Store (RADOS) via librados. This ioengine defines engine specific
+options.
+.TP
.B rbd
I/O engine supporting direct access to Ceph Rados Block Devices
(RBD) via librbd without the need to use the kernel rbd driver. This
.RE
.RE
.TP
-.BI (rbd)clustername \fR=\fPstr
+.BI (rbd,rados)clustername \fR=\fPstr
Specifies the name of the Ceph cluster.
.TP
.BI (rbd)rbdname \fR=\fPstr
Specifies the name of the RBD.
.TP
-.BI (rbd)pool \fR=\fPstr
-Specifies the name of the Ceph pool containing RBD.
+.BI (rbd,rados)pool \fR=\fPstr
+Specifies the name of the Ceph pool containing RBD or RADOS data.
.TP
-.BI (rbd)clientname \fR=\fPstr
+.BI (rbd,rados)clientname \fR=\fPstr
Specifies the username (without the 'client.' prefix) used to access the
Ceph cluster. If the \fBclustername\fR is specified, the \fBclientname\fR shall be
the full *type.id* string. If no type. prefix is given, fio will add 'client.'
by default.
.TP
+.BI (rbd,rados)busy_poll \fR=\fPbool
+Poll store instead of waiting for completion. Usually this provides better
+throughput at cost of higher(up to 100%) CPU utilization.
+.TP
.BI (mtd)skip_bad \fR=\fPbool
Skip operations against known bad blocks.
.TP
on the client site it will be used in the rdma_resolve_add()
function. This can be useful when multiple paths exist between the
client and the server or in certain loopback configurations.
+.TP
+.BI (sg)readfua \fR=\fPbool
+With readfua option set to 1, read operations include the force
+unit access (fua) flag. Default: 0.
+.TP
+.BI (sg)writefua \fR=\fPbool
+With writefua option set to 1, write operations include the force
+unit access (fua) flag. Default: 0.
.SS "I/O depth"
.TP
.BI iodepth \fR=\fPint
<mode>[:<nodelist>]
.RE
.P
-`mode' is one of the following memory poicies: `default', `prefer',
+`mode' is one of the following memory policies: `default', `prefer',
`bind', `interleave' or `local'. For `default' and `local' memory
policies, no node needs to be specified. For `prefer', only one node is
allowed. For `bind' and `interleave' the `nodelist' may be as
each block. This will automatically use hardware acceleration
(e.g. SSE4.2 on an x86 or CRC crypto extensions on ARM64) but will
fall back to software crc32c if none is found. Generally the
-fatest checksum fio supports when hardware accelerated.
+fastest checksum fio supports when hardware accelerated.
.TP
.B crc32c\-intel
Synonym for crc32c.
projects / fio.git / blobdiff