diskinfo(8): introduce new option -l

In modes -p or -s, add an option -l to start each line
with a device name separated with a tab. Update the manual page.
Add an example to list names with corresp

diskinfo(8): introduce new option -l

In modes -p or -s, add an option -l to start each line
with a device name separated with a tab. Update the manual page.
Add an example to list names with corresponding serial numbers:

diskinfo -ls /dev/da?

MFC after: 2 weeks

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Merge ^/head r323559 through r325504.

MFhead@r324482

Fix copy/paste error in diskinfo.8 from r320555

MFC after: 1 week
Sponsored by: Spectra Logic Corp

MFhead@r320180

Merge ^/head r319973 through 321382.

Merge ^/head r320573 through r320970.

Add naive benchmark for SSDs in ZFS SLOG role.

ZFS SLOGs have very specific access pattern with many cache flushes,
which none of benchmarks I know can simulate. Since SSD vendors rarely
specify ca

Add naive benchmark for SSDs in ZFS SLOG role.

ZFS SLOGs have very specific access pattern with many cache flushes,
which none of benchmarks I know can simulate. Since SSD vendors rarely
specify cache flush time, this measurement can be useful to explain why
some ZFS pools are slower then expected. This test writes data chunks
of different size followed by cache flush, alike to what ZFS SLOG does,
and measures average time.

To illustrate, here is result for 6 years old SATA Intel 710 Series SSD:

Synchronous random writes:
0.5 kbytes: 138.3 usec/IO = 3.5 Mbytes/s
1 kbytes: 137.7 usec/IO = 7.1 Mbytes/s
2 kbytes: 151.1 usec/IO = 12.9 Mbytes/s
4 kbytes: 158.2 usec/IO = 24.7 Mbytes/s
8 kbytes: 175.6 usec/IO = 44.5 Mbytes/s
16 kbytes: 210.1 usec/IO = 74.4 Mbytes/s
32 kbytes: 274.2 usec/IO = 114.0 Mbytes/s
64 kbytes: 416.5 usec/IO = 150.1 Mbytes/s
128 kbytes: 776.6 usec/IO = 161.0 Mbytes/s
256 kbytes: 1503.1 usec/IO = 166.3 Mbytes/s
512 kbytes: 2968.7 usec/IO = 168.4 Mbytes/s
1024 kbytes: 5866.8 usec/IO = 170.5 Mbytes/s
2048 kbytes: 11696.6 usec/IO = 171.0 Mbytes/s
4096 kbytes: 23329.6 usec/IO = 171.5 Mbytes/s
8192 kbytes: 46779.5 usec/IO = 171.0 Mbytes/s

, and much newer and supposedly much faster NVMe Samsung 950 PRO SSD:

Synchronous random writes:
0.5 kbytes: 2092.9 usec/IO = 0.2 Mbytes/s
1 kbytes: 2013.1 usec/IO = 0.5 Mbytes/s
2 kbytes: 2014.8 usec/IO = 1.0 Mbytes/s
4 kbytes: 2090.7 usec/IO = 1.9 Mbytes/s
8 kbytes: 2044.5 usec/IO = 3.8 Mbytes/s
16 kbytes: 2084.8 usec/IO = 7.5 Mbytes/s
32 kbytes: 2137.1 usec/IO = 14.6 Mbytes/s
64 kbytes: 2173.4 usec/IO = 28.8 Mbytes/s
128 kbytes: 2923.9 usec/IO = 42.8 Mbytes/s
256 kbytes: 3085.3 usec/IO = 81.0 Mbytes/s
512 kbytes: 3112.2 usec/IO = 160.7 Mbytes/s
1024 kbytes: 2430.6 usec/IO = 411.4 Mbytes/s
2048 kbytes: 3788.9 usec/IO = 527.9 Mbytes/s
4096 kbytes: 6198.0 usec/IO = 645.4 Mbytes/s
8192 kbytes: 10764.9 usec/IO = 743.2 Mbytes/s

While the first one obviously has maximal throughput limitations, the
second one has so high cache flush latency (about 2 millisecond), that
it makes one almost useless in SLOG role, despite of its good throughput
numbers. Power loss protection is out of scope of this test, but I
suspect it can be related.

MFC after: 2 weeks
Sponsored by: iXsystems, Inc.

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diskinfo(8): correct typo in man page

Reported by: N.J. Mann <njm@njm.me.uk>

Merge ^/head r320398 through r320572.

Add -s (serial) and -p (physpath) to diskinfo

Return the bare requested information, intended for scripting.

The serial number of a SAS/SCSI device can be returned with
'camcontrol inquiry disk -S'

Add -s (serial) and -p (physpath) to diskinfo

Return the bare requested information, intended for scripting.

The serial number of a SAS/SCSI device can be returned with
'camcontrol inquiry disk -S', but there is no similar switch for SATA.

This provides a way to get this information from both SAS and SATA disks

the -s and -p flags are mutually exclusive, and cannot be used with any
other flags.

Reviewed by: rpokala, wblock
MFC after: 1 month
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D7828

show more ...

Merge ^/head r305892 through r306302.

Small tweaks to the diskinfo(8) manual page, to make it more consistent
with others.

MFC after: 1 month

Add "diskinfo -i", a simple aio-based IOPS benchmark.

MFC after: 1 month

IFH@204581

Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

MFC 200968:
Make diskinfo report disk stripe size and offset. It should help users to
make file systems optimally aligned and tuned for better performance.

Make diskinfo report disk stripe size and offset. It should help users to
make file systems optimally aligned and tuned for better performance.

Sort sections.

Add -c to SYNOPSIS and usage().

Add -c option that calculates the overhead of read I/O ops.

Sync manpage's synopsis with usage().

Assorted mdoc(7) fixes.

Correct a type in the bugs section. Also turn it into a list.

Approved by: re(murray)