man: IO -> I/O; I/Os -> I/O operations again

Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13116

man/man8/zdb.8

@@ -25,7 +25,7 @@
 .Nm
 .Op Fl AbcdDFGhikLMNPsvXYy
 .Op Fl e Oo Fl V Oc Oo Fl p Ar path Oc Ns …
-.Op Fl I Ar inflight I/Os
+.Op Fl I Ar inflight-I/O-ops
 .Oo Fl o Ar var Ns = Ns Ar value Oc Ns …
 .Op Fl t Ar txg
 .Op Fl U Ar cache
@@ -404,8 +404,8 @@ transactions.
 Dump the contents of the zfs_dbgmsg buffer before exiting
 .Nm .
 zfs_dbgmsg is a buffer used by ZFS to dump advanced debug information.
-.It Fl I , -inflight Ns = Ns Ar inflight I/Os
-Limit the number of outstanding checksum I/Os to the specified value.
+.It Fl I , -inflight Ns = Ns Ar inflight-I/O-ops
+Limit the number of outstanding checksum I/O operations to the specified value.
 The default value is 200.
 This option affects the performance of the
 .Fl c

man/man8/zinject.8

@@ -71,18 +71,18 @@ Force a vdev into the DEGRADED or FAULTED state.
 .Fl D Ar latency : Ns Ar lanes
 .Ar pool
 .Xc
-Add an artificial delay to IO requests on a particular
+Add an artificial delay to I/O requests on a particular
 device, such that the requests take a minimum of
 .Ar latency
 milliseconds to complete.
 Each delay has an associated number of
 .Ar lanes
 which defines the number of concurrent
-IO requests that can be processed.
+I/O requests that can be processed.
 .Pp
 For example, with a single lane delay of 10 ms
 .No (\& Ns Fl D Ar 10 : Ns Ar 1 ) ,
-the device will only be able to service a single IO request
+the device will only be able to service a single I/O request
 at a time with each request taking 10 ms to complete.
 So, if only a single request is submitted every 10 ms, the
 average latency will be 10 ms; but if more than one request

man/man8/zpool-remove.8

@@ -66,7 +66,7 @@ command initiates the removal and returns, while the evacuation continues in
 the background.
 The removal progress can be monitored with
 .Nm zpool Cm status .
-If an IO error is encountered during the removal process it will be cancelled.
+If an I/O error is encountered during the removal process it will be cancelled.
 The
 .Sy device_removal
 feature flag must be enabled to remove a top-level vdev, see

man/man8/zpool-status.8

@@ -93,12 +93,12 @@ and referenced
 .Pq logically referenced in the pool
 block counts and sizes by reference count.
 .It Fl s
-Display the number of leaf vdev slow IOs.
-This is the number of IOs that
-didn't complete in
+Display the number of leaf vdev slow I/O operations.
+This is the number of I/O operations that didn't complete in
 .Sy zio_slow_io_ms
-milliseconds (default 30 seconds).
-This does not necessarily mean the IOs failed to complete, just took an
+milliseconds
+.Pq Sy 30000 No by default .
+This does not necessarily mean the I/O operations failed to complete, just took an
 unreasonably long amount of time.
 This may indicate a problem with the underlying storage.
 .It Fl t

man/man8/zpool.8

@@ -148,8 +148,8 @@ for the specified storage pool(s).
 .It Xr zpool-status 8
 Displays the detailed health status for the given pools.
 .It Xr zpool-iostat 8
-Displays logical I/O statistics for the given pools/vdevs. Physical I/Os may
-be observed via
+Displays logical I/O statistics for the given pools/vdevs.
+Physical I/O operations may be observed via
 .Xr iostat 1 .
 .It Xr zpool-events 8
 Lists all recent events generated by the ZFS kernel modules.