CentOS 8
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Display Disk Settings2020/01/08

 
Display Disk Settings information on your Computer.
[1] Install required packages.
For SCSI or SATA devices, Install [hdparm], For NVMe devices like M.2 SSD, Install [nvme-cli].
[root@dlp ~]#
dnf -y install hdparm nvme-cli
[2] This is the basic usage for [hdparm].
# display basic disk settings

[root@dlp ~]#
hdparm /dev/sda

/dev/sda:
 multcount     = 16 (on)
 IO_support    =  1 (32-bit)
 readonly      =  0 (off)
 readahead     = 8192 (on)
 geometry      = 364801/255/63, sectors = 5860533168, start = 0

# display detailed disk info

[root@dlp ~]#
hdparm -I /dev/sda


/dev/sda:

ATA device, with non-removable media
        Model Number:       ST3000VN007-2E4166
        Serial Number:      Z6A084MY
        Firmware Revision:  SC60
        Transport:          Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
        Used: unknown (minor revision code 0x001f)
        Supported: 9 8 7 6 5
        Likely used: 9
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
.....
.....

# run cached and buffered reads test

[root@dlp ~]#
hdparm -Tt /dev/sda


/dev/sda:
 Timing cached reads:   22418 MB in  1.99 seconds = 11270.03 MB/sec
 Timing buffered disk reads: 1380 MB in  3.00 seconds = 459.57 MB/sec
[3] This is the basic usage for [nvme-cli].
# display NVMe devices

[root@dlp ~]#
nvme list


Node             SN                   Model                                    Namespace Usage                      Format           FW Rev
---------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1     BTNH93310Q5T1P0B     INTEL SSDPEKNW010T8                      1           1.02  TB /   1.02  TB    512   B +  0 B   002C
/dev/nvme1n1     P02724117355         PLEXTOR PX-1TM8SeY                       1           1.02  TB /   1.02  TB    512   B +  0 B   1.00

# display device info

[root@dlp ~]#
nvme id-ctrl -H /dev/nvme0n1


NVME Identify Controller:
vid       : 0x8086
ssvid     : 0x8086
sn        : BTNH93310Q5T1P0B
mn        : INTEL SSDPEKNW010T8
fr        : 002C
rab       : 6
ieee      : 5cd2e4
cmic      : 0
  [2:2] : 0     PCI
  [1:1] : 0     Single Controller
  [0:0] : 0     Single Port

mdts      : 5
cntlid    : 1
ver       : 10300
rtd3r     : 7a120
rtd3e     : 1e8480
oaes      : 0x200
.....
.....

# display SMART log

[root@dlp ~]#
nvme smart-log /dev/nvme0n1

Smart Log for NVME device:nvme0n1 namespace-id:ffffffff
critical_warning                    : 0
temperature                         : 36 C
available_spare                     : 100%
available_spare_threshold           : 10%
percentage_used                     : 0%
data_units_read                     : 7,840
data_units_written                  : 279,605
host_read_commands                  : 36,731
host_write_commands                 : 2,155,655
controller_busy_time                : 7
power_cycles                        : 4
power_on_hours                      : 2,085
unsafe_shutdowns                    : 0
media_errors                        : 0
num_err_log_entries                 : 0
Warning Temperature Time            : 0
Critical Composite Temperature Time : 0
Thermal Management T1 Trans Count   : 7
Thermal Management T2 Trans Count   : 0
Thermal Management T1 Total Time    : 98
Thermal Management T2 Total Time    : 0

# display error log

[root@dlp ~]#
nvme error-log /dev/nvme0n1

Error Log Entries for device:nvme0n1 entries:64
.................
 Entry[ 0]
.................
error_count  : 0
sqid         : 0
cmdid        : 0
status_field : 0(SUCCESS: The command completed successfully)
parm_err_loc : 0
lba          : 0
nsid         : 0
vs           : 0
cs           : 0
.....
.....
[4] For benchmarking to any Disk, it's possible to do with [fio (Flexible I/O Tester)] tool.
[root@dlp ~]#
dnf -y install fio
# test sequential reads with 4K block size

[root@dlp ~]#
fio --bs=4k --size=1G --direct=1 --rw=read --numjobs=64 --runtime=10 --group_reporting --name=testjob4K1G --filename=/var/m2/testfile4K1G


testjob4K1G: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1
...
fio-3.7
Starting 64 processes
testjob4K1G: Laying out IO file (1 file / 1024MiB)
Jobs: 61 (f=59): [E(1),f(1),E(2),R(6),f(1),R(53)][100.0%][r=1165MiB/s,w=0KiB/s][r=298k,w=0 IOPS][eta 00m:00s]
testjob4K1G: (groupid=0, jobs=64): err= 0: pid=8000: Tue Jan  7 14:01:05 2020
   read: IOPS=299k, BW=1169MiB/s (1226MB/s)(11.4GiB/10002msec)
    clat (usec): min=33, max=4488, avg=213.16, stdev=31.87
     lat (usec): min=33, max=4488, avg=213.25, stdev=31.87
    clat percentiles (usec):
     |  1.00th=[  180],  5.00th=[  194], 10.00th=[  198], 20.00th=[  204],
     | 30.00th=[  206], 40.00th=[  208], 50.00th=[  210], 60.00th=[  215],
     | 70.00th=[  219], 80.00th=[  223], 90.00th=[  231], 95.00th=[  239],
     | 99.00th=[  258], 99.50th=[  265], 99.90th=[  302], 99.95th=[  502],
     | 99.99th=[ 1270]
   bw (  KiB/s): min=18123, max=20000, per=1.56%, avg=18709.27, stdev=327.56, samples=1223
   iops        : min= 4530, max= 5000, avg=4677.30, stdev=81.89, samples=1223
  lat (usec)   : 50=0.01%, 100=0.03%, 250=98.02%, 500=1.90%, 750=0.03%
  lat (usec)   : 1000=0.01%
  lat (msec)   : 2=0.01%, 4=0.01%, 10=0.01%
  cpu          : usr=0.83%, sys=2.29%, ctx=2992979, majf=0, minf=749
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=2992737,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=1169MiB/s (1226MB/s), 1169MiB/s-1169MiB/s (1226MB/s-1226MB/s), io=11.4GiB (12.3GB), run=10002-10002msec

Disk stats (read/write):
  nvme1n1: ios=2924615/7, merge=0/0, ticks=608592/22, in_queue=779, util=98.84%

# test sequential reads with 512K block size

[root@dlp ~]#
fio --bs=512k --size=1G --direct=1 --rw=read --numjobs=64 --runtime=10 --group_reporting --name=testjob512K1G --filename=/var/m2/testfile512K1G


testjob512K1G: (g=0): rw=read, bs=(R) 512KiB-512KiB, (W) 512KiB-512KiB, (T) 512KiB-512KiB, ioengine=psync, iodepth=1
...
fio-3.7
Starting 64 processes
testjob512K1G: Laying out IO file (1 file / 1024MiB)
Jobs: 64 (f=64): [R(64)][100.0%][r=2392MiB/s,w=0KiB/s][r=4784,w=0 IOPS][eta 00m:00s]
testjob512K1G: (groupid=0, jobs=64): err= 0: pid=7884: Tue Jan  7 14:00:09 2020
   read: IOPS=4763, BW=2382MiB/s (2498MB/s)(23.3GiB/10014msec)
    clat (usec): min=433, max=27306, avg=13411.41, stdev=1990.06
     lat (usec): min=433, max=27307, avg=13411.67, stdev=1990.07
    clat percentiles (usec):
     |  1.00th=[13042],  5.00th=[13042], 10.00th=[13042], 20.00th=[13042],
     | 30.00th=[13042], 40.00th=[13042], 50.00th=[13042], 60.00th=[13042],
     | 70.00th=[13042], 80.00th=[13042], 90.00th=[13042], 95.00th=[13304],
     | 99.00th=[25822], 99.50th=[26870], 99.90th=[27132], 99.95th=[27132],
     | 99.99th=[27132]
   bw (  KiB/s): min=36790, max=44032, per=1.56%, avg=38108.50, stdev=1125.47, samples=1280
   iops        : min=   71, max=   86, avg=74.38, stdev= 2.21, samples=1280
  lat (usec)   : 500=0.01%, 750=0.01%, 1000=0.01%
  lat (msec)   : 2=0.02%, 4=0.04%, 10=0.14%, 20=97.12%, 50=2.66%
  cpu          : usr=0.03%, sys=0.24%, ctx=47939, majf=0, minf=8823
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=47705,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=2382MiB/s (2498MB/s), 2382MiB/s-2382MiB/s (2498MB/s-2498MB/s), io=23.3GiB (25.0GB), run=10014-10014msec

Disk stats (read/write):
  nvme1n1: ios=187741/0, merge=0/0, ticks=2498092/0, in_queue=2356724, util=98.64%
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