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Add zpool status -s (slow I/Os) and -p (parseable)

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This patch adds a new slow I/Os (-s) column to zpool status to show the
number of VDEV slow I/Os. This is the number of I/Os that didn't
complete in zio_slow_io_ms milliseconds. It also adds a new parsable
(-p) flag to display exact values.

 	NAME         STATE     READ WRITE CKSUM  SLOW
 	testpool     ONLINE       0     0     0     -
	  mirror-0   ONLINE       0     0     0     -
 	    loop0    ONLINE       0     0     0    20
 	    loop1    ONLINE       0     0     0     0

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #7756
Closes #6885
This commit is contained in:
Tony Hutter
2018-11-08 16:47:24 -08:00
committed by Brian Behlendorf
parent 877d925a9e
commit ad796b8a3b
16 changed files with 321 additions and 136 deletions
Download Patch File Download Diff File Expand all files Collapse all files
man/man5/zfs-events.5
+6 -6
View File
@@ -96,8 +96,9 @@ information regarding "hung" I/O detection and configuration.
.ad
.RS 12n
Issued when a completed I/O exceeds the maximum allowed time specified
by the \fBzio_delay_max\fR module option. This can be an indicator of
problems with the underlying storage device.
by the \fBzio_slow_io_ms\fR module option. This can be an indicator of
problems with the underlying storage device. The number of delay events is
ratelimited by the \fBzfs_slow_io_events_per_second\fR module parameter.
.RE
.sp
@@ -697,10 +698,9 @@ full list of all the I/O stages.
\fBzio_delay\fR
.ad
.RS 12n
The time in ticks (HZ) required for the block layer to service the I/O. Unlike
\fBzio_delta\fR this does not include any vdev queuing time and is therefore
solely a measure of the block layer performance. On most modern Linux systems
HZ is defined as 1000 making a tick equivalent to 1 millisecond.
The time elapsed (in nanoseconds) waiting for the block layer to complete the
I/O. Unlike \fBzio_delta\fR this does not include any vdev queuing time and is
therefore solely a measure of the block layer performance.
.RE
.sp
man/man5/zfs-module-parameters.5
+11 -10
View File
@@ -1086,7 +1086,7 @@ Default value: \fB600,000\fR.
.ad
.RS 12n
Interval in milliseconds after which the deadman is triggered and an
individual IO operation is considered to be "hung". As long as the I/O
individual I/O operation is considered to be "hung". As long as the I/O
remains "hung" the deadman will be invoked every \fBzfs_deadman_checktime_ms\fR
milliseconds until the I/O completes.
.sp
@@ -1141,10 +1141,10 @@ Default value: \fB500,000\fR.
.sp
.ne 2
.na
\fBzfs_delays_per_second\fR (int)
\fBzfs_low_ios_per_second\fR (int)
.ad
.RS 12n
Rate limit IO delay events to this many per second.
Rate limit delay zevents (which report slow I/Os) to this many per second.
.sp
Default value: 20
.RE
@@ -1655,7 +1655,7 @@ Default value: \fB50\fR.
.ad
.RS 12n
We currently support block sizes from 512 bytes to 16MB. The benefits of
larger blocks, and thus larger IO, need to be weighed against the cost of
larger blocks, and thus larger I/O, need to be weighed against the cost of
COWing a giant block to modify one byte. Additionally, very large blocks
can have an impact on i/o latency, and also potentially on the memory
allocator. Therefore, we do not allow the recordsize to be set larger than
@@ -2552,12 +2552,13 @@ Default value: \fB0\fR.
.sp
.ne 2
.na
\fBzio_delay_max\fR (int)
\fBzio_slow_io_ms\fR (int)
.ad
.RS 12n
A zevent will be logged if a ZIO operation takes more than N milliseconds to
complete. Note that this is only a logging facility, not a timeout on
operations.
When an I/O operation takes more than \fBzio_slow_io_ms\fR milliseconds to
complete is marked as a slow I/O. Each slow I/O causes a delay zevent. Slow
I/O counters can be seen with "zpool status -s".
.sp
Default value: \fB30,000\fR.
.RE
@@ -2568,7 +2569,7 @@ Default value: \fB30,000\fR.
\fBzio_dva_throttle_enabled\fR (int)
.ad
.RS 12n
Throttle block allocations in the ZIO pipeline. This allows for
Throttle block allocations in the I/O pipeline. This allows for
dynamic allocation distribution when devices are imbalanced.
When enabled, the maximum number of pending allocations per top-level vdev
is limited by \fBzfs_vdev_queue_depth_pct\fR.
@@ -2594,7 +2595,7 @@ Default value: \fB0\fR.
.ad
.RS 12n
Percentage of online CPUs (or CPU cores, etc) which will run a worker thread
for IO. These workers are responsible for IO work such as compression and
for I/O. These workers are responsible for I/O work such as compression and
checksum calculations. Fractional number of CPUs will be rounded down.
.sp
The default value of 75 was chosen to avoid using all CPUs which can result in