On Thu, 2019-01-03 at 13:28 -0500, Laurence Oberman wrote:
> On Wed, 2019-01-02 at 11:10 -0500, Laurence Oberman wrote:
> > On Wed, 2019-01-02 at 15:29 +0000, Sitsofe Wheeler wrote:
> > > (Also trying linux-ide list)
> > >
> > > On Wed, 2 Jan 2019 at 15:25, Sitsofe Wheeler <sitsofe@xxxxxxxxx>
> > > wrote:
> > > >
> > > > Hi,
> > > >
> > > > I recently purchased a SATA Samsung 860 EVO SSD and put it in
> > > > an
> > > > old
> > > > HP microserver (which has an AMD N36L). By default, when the
> > > > disk
> > > > load
> > > > becomes a little heavy e.g. by running a job like
> > > >
> > > > fio --name=test --readonly --rw=randread --filename /dev/sdb --
> > > > bs=32k \
> > > > --ioengine=libaio --iodepth=32 --direct=1 --runtime=10m --
> > > > time_based=1
> > > >
> > > > the kernel starts repeatedly producing error messages like:
> > > >
> > > > [ 1177.729912] ata2.00: exception Emask 0x10 SAct 0x3c000 SErr
> > > > 0x0
> > > > action 0x6 frozen
> > > > [ 1177.729931] ata2.00: irq_stat 0x08000000, interface fatal
> > > > error
> > > > [ 1177.729943] ata2.00: failed command: WRITE FPDMA QUEUED
> > > > [ 1177.729962] ata2.00: cmd 61/80:70:80:50:e6/06:00:00:00:00/40
> > > > tag
> > > > 14
> > > > ncq dma 851968 out
> > > > [ 1177.729962] res 40/00:80:00:5a:e6/00:00:00:00:00/40
> > > > Emask
> > > > 0x10 (ATA bus error)
> > > > [ 1177.729978] ata2.00: status: { DRDY }
> > > > [ 1177.729986] ata2.00: failed command: WRITE FPDMA QUEUED
> > > > [ 1177.730002] ata2.00: cmd 61/00:78:00:57:e6/03:00:00:00:00/40
> > > > tag
> > > > 15
> > > > ncq dma 393216 out
> > > > [ 1177.730002] res 40/00:80:00:5a:e6/00:00:00:00:00/40
> > > > Emask
> > > > 0x10 (ATA bus error)
> > > > [ 1177.730017] ata2.00: status: { DRDY }
> > > > [ 1177.730024] ata2.00: failed command: WRITE FPDMA QUEUED
> > > > [ 1177.730039] ata2.00: cmd 61/00:80:00:5a:e6/05:00:00:00:00/40
> > > > tag
> > > > 16
> > > > ncq dma 655360 out
> > > > [ 1177.730039] res 40/00:80:00:5a:e6/00:00:00:00:00/40
> > > > Emask
> > > > 0x10 (ATA bus error)
> > > > [ 1177.730053] ata2.00: status: { DRDY }
> > > > [ 1177.730060] ata2.00: failed command: WRITE FPDMA QUEUED
> > > > [ 1177.730078] ata2.00: cmd 61/00:88:00:5f:e6/01:00:00:00:00/40
> > > > tag
> > > > 17
> > > > ncq dma 131072 out
> > > > [ 1177.730078] res 40/00:80:00:5a:e6/00:00:00:00:00/40
> > > > Emask
> > > > 0x10 (ATA bus error)
> > > > [ 1177.730096] ata2.00: status: { DRDY }
> > > > [ 1177.730108] ata2: hard resetting link
> > > > [ 1178.205831] ata2: SATA link up 3.0 Gbps (SStatus 123
> > > > SControl
> > > > 300)
> > > > [ 1178.206165] ata2.00: supports DRM functions and may not be
> > > > fully
> > > > accessible
> > > > [ 1178.209743] ata2.00: supports DRM functions and may not be
> > > > fully
> > > > accessible
> > > > [ 1178.212786] ata2.00: configured for UDMA/133
> > > > [ 1178.212826] ata2: EH complete
> > > > [ 1178.212988] ata2.00: Enabling discard_zeroes_data
> > > >
> > > > I tried moving the SSD to another caddy and bay but the issue
> > > > persists. None of the regular hard disks (a Western Digital and
> > > > a
> > > > Seagate) nor the other SSD (a Crucial MX500) already in the
> > > > system
> > > > trigger the issue the Samsung 860 EVO does. Adding
> > > >
> > > > libata.force=2.00:noncq
> > > >
> > > > seems to make the issue go away but seemingly at some speed
> > > > cost
> > > > (at
> > > > least compared to what the MX500 achieves). The OS in use is
> > > > Ubuntu
> > > > 18.04 with a 4.15.0-43-generic kernel but even a 4.18.0-13-
> > > > generic
> > > > had
> > > > the same issue.
> > > >
> > > > Is there anything software-wise that might need investigating
> > > > that
> > > > would allow NCQ to work and a better speed to be reached?
> > >
> > >
> >
> > Hello
> >
> > I have seen issues reported due to low power delivery to the drive.
> > However investigating this, its starts with an exception Emask and
> > then
> > the link error code runs.
> > Reviewing online some folks are reporting cable issues can cause
> > this
> > or firmware.
> > I don't have one to test myself, and you are using an enclosure.
> > Are
> > you able to connect direct to the motherboard via another cable and
> > test again.
> >
> > Regards
> > Laurence
>
> I managed to find a 860 so going to test it and see if I see the same
> behavior and report back
>
> Thanks
> Laurence
Hello
I put the 860 in an enclosure (MSA50) driven by a SAS HBA
(megaraid)sas)
The backplane is SAS or SATA
/dev/sg2 0 0 49 0 0 /dev/sdb ATA Samsung SSD 860 1B6Q
Running the same fio test of yours on latest RHEL7 and 4.20.0+-1 I am
unable to reproduce this issue of yours after multiple test runs.
Tests all run to completion with no errors on RHEL7 and upstream
kernels.
I have no way to test at the moment with a direct motherboard
connection to a SATA port so if this is a host side issue with sata
(ATA) I would not see it.
What this likely means is that the drive itself seems to be well
behaved here and the power or cable issue I alluded to earlier may be
worth looking into for you or possibly the host ATA interface.
RHEL7 kernel
3.10.0-862.11.1.el7.x86_64
test: (g=0): rw=randread, bs=(R) 32.0KiB-32.0KiB, (W) 32.0KiB-32.0KiB,
(T) 32.0KiB-32.0KiB, ioengine=libaio, iodepth=32
fio-3.3-38-gf5ec8
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=120MiB/s,w=0KiB/s][r=3839,w=0 IOPS][eta
00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=3974: Thu Jan 3 15:14:10 2019
read: IOPS=3827, BW=120MiB/s (125MB/s)(70.1GiB/600009msec)
slat (usec): min=7, max=374, avg=23.78, stdev= 6.09
clat (usec): min=449, max=509311, avg=8330.29, stdev=2060.29
lat (usec): min=514, max=509331, avg=8355.00, stdev=2060.29
clat percentiles (usec):
| 1.00th=[ 5342], 5.00th=[ 7767], 10.00th=[ 8225], 20.00th=[
8291],
| 30.00th=[ 8291], 40.00th=[ 8291], 50.00th=[ 8291], 60.00th=[
8291],
| 70.00th=[ 8356], 80.00th=[ 8356], 90.00th=[ 8455], 95.00th=[
8848],
| 99.00th=[11600], 99.50th=[13042], 99.90th=[16581],
99.95th=[17695],
| 99.99th=[19006]
bw ( KiB/s): min=50560, max=124472, per=99.94%, avg=122409.89,
stdev=2592.08, samples=1200
iops : min= 1580, max= 3889, avg=3825.22, stdev=81.01,
samples=1200
lat (usec) : 500=0.01%, 750=0.03%, 1000=0.02%
lat (msec) : 2=0.08%, 4=0.32%, 10=97.20%, 20=2.34%, 50=0.01%
lat (msec) : 750=0.01%
cpu : usr=4.76%, sys=12.81%, ctx=2113947, majf=0, minf=14437
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%,
>=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=0.1%, 64=0.0%,
>=64=0.0%
issued rwts: total=2296574,0,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: bw=120MiB/s (125MB/s), 120MiB/s-120MiB/s (125MB/s-125MB/s),
io=70.1GiB (75.3GB), run=600009-600009msecmodinfo ata
Disk stats (read/write):
sdb: ios=2295763/0, merge=0/0, ticks=18786069/0, in_queue=18784356,
util=100.00%
Upstream Kernel
4.20.0+-1.x86_64
[root@localhost ~]# ./test_ssd.sh
test: (g=0): rw=randread, bs=(R) 32.0KiB-32.0KiB, (W) 32.0KiB-32.0KiB,
(T) 32.0KiB-32.0KiB, ioengine=libaio, iodepth=32
fio-3.3-38-gf5ec8
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=120MiB/s,w=0KiB/s][r=3835,w=0 IOPS][eta
00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=2895: Thu Jan 3 15:47:21 2019
read: IOPS=3826, BW=120MiB/s (125MB/s)(70.1GiB/600009msec)
slat (usec): min=5, max=410, avg=26.92, stdev= 3.81
clat (usec): min=760, max=1287.1k, avg=8327.27, stdev=4756.19
lat (usec): min=787, max=1287.1k, avg=8355.50, stdev=4756.18
clat percentiles (usec):
| 1.00th=[ 8225], 5.00th=[ 8291], 10.00th=[ 8291], 20.00th=[
8291],
| 30.00th=[ 8291], 40.00th=[ 8291], 50.00th=[ 8291], 60.00th=[
8291],
| 70.00th=[ 8356], 80.00th=[ 8356], 90.00th=[ 8356], 95.00th=[
8356],
| 99.00th=[ 8455], 99.50th=[ 8455], 99.90th=[ 8455], 99.95th=[
8455],
| 99.99th=[ 9765]
bw ( KiB/s): min=25152, max=124559, per=100.00%, avg=122589.35,
stdev=3879.77, samples=1199
iops : min= 786, max= 3892, avg=3830.88, stdev=121.24,
samples=1199
lat (usec) : 1000=0.01%
lat (msec) : 2=0.01%, 4=0.01%, 10=99.99%, 20=0.01%
cpu : usr=4.19%, sys=18.68%, ctx=2295902, majf=0, minf=278
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%,
>=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=0.1%, 64=0.0%,
>=64=0.0%
issued rwts: total=2296041,0,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: bw=120MiB/s (125MB/s), 120MiB/s-120MiB/s (125MB/s-125MB/s),
io=70.1GiB (75.2GB), run=600009-600009msec
Disk stats (read/write):
sdb: ios=2296022/0, merge=0/0, ticks=19111730/0, in_queue=18408961,
util=99.87%
