Poor IO Performance on ZFS Volume, but not disks

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_Paul

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I'm having trouble with my TrueNAS Installation. It has historically been a Freenas (... back in the days of FreeNAS 11), which worked wonderful for the last years. With freeNAS 11 I've managed to copy and read easily around 90-100mb/s from and to the NAS on SMB, AFP, or RSYNC.

However, I've noted that as of lately, no matter what I do, I can't seem to achieve those speeds anymore but instead am limited to 4-11mb/s. I've searched around the forum, but unlike most others both read and writes are slow (and non of the there-mentioned solutions seemed to help).

Since it's slow on RSYNC as well as SMB or AFP, I think I can rule these as culprits out. So this lead me to two conclusions: Harddrive failure or networking problem.

However, it seems to be none of these two options - iperf3 shows the full gigabit connection speed, so it likely is not a networking issue. Harddrive SMART Values look fine, do a periodic selftest (and complete them successfully without errors), so I decided to remove one drive from the pool and readd it again. The result had been a resilvering tasks with 2.4TB of data, which completed in about 9 hours, leading to an average of 73mb/s when resilvering, so I think it's safe to rule that one too out.

Does anyone have a clue, what could possibly be any other culprit?

My system specs are as follows:
Motherboard: Gigabyte H87-HD3
CPU: Intel(R) Xeon(R) CPU E3-1230 v3 @ 3.30GH
RAM: 4*8GB DDR3 -> 32GB total
HDD: 2* 4TB WD RED (Mirrored)

Systemload is usually pretty idle, as this is my personal NAS device, nothing with lots of users or something.

TrueNAS Version: 12.0-U4.1

Code:
smartctl 7.2 2020-12-30 r5155 [FreeBSD 12.2-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    WD-WCC4E1620954
LU WWN Device Id: 5 0014ee 2b4c4b086
Firmware Version: 80.00A80
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Aug  3 15:00:17 2021 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)    Offline data collection activity
                    was never started.
                    Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)    The previous self-test routine completed
                    without error or no self-test has ever
                    been run.
Total time to complete Offline
data collection:         (53520) seconds.
Offline data collection
capabilities:              (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    Conveyance Self-test supported.
                    Selective Self-test supported.
SMART capabilities:            (0x0003)    Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01)    Error logging supported.
                    General Purpose Logging supported.
Short self-test routine
recommended polling time:      (   2) minutes.
Extended self-test routine
recommended polling time:      ( 535) minutes.
Conveyance self-test routine
recommended polling time:      (   5) minutes.
SCT capabilities:            (0x703d)    SCT Status supported.
                    SCT Error Recovery Control supported.
                    SCT Feature Control supported.
                    SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   175   175   021    Pre-fail  Always       -       8208
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       96
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   100   253   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   014   014   000    Old_age   Always       -       63325
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       40
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       19
193 Load_Cycle_Count        0x0032   182   182   000    Old_age   Always       -       55470
194 Temperature_Celsius     0x0022   110   103   000    Old_age   Always       -       42
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     63274         -
# 2  Short offline       Completed without error       00%     63166         -
# 3  Short offline       Completed without error       00%     62999         -
# 4  Short offline       Completed without error       00%     62831         -
# 5  Short offline       Completed without error       00%     62663         -
# 6  Extended offline    Completed without error       00%     62530         -
# 7  Short offline       Completed without error       00%     62447         -
# 8  Short offline       Completed without error       00%     62279         -
# 9  Short offline       Completed without error       00%     62112         -
#10  Short offline       Completed without error       00%     61944         -
#11  Extended offline    Completed without error       00%     61813         -
#12  Short offline       Completed without error       00%     61704         -
#13  Short offline       Completed without error       00%     61536         -
#14  Short offline       Completed without error       00%     61368         -
#15  Short offline       Completed without error       00%     61200         -
#16  Extended offline    Completed without error       00%     61068         -
#17  Short offline       Completed without error       00%     60984         -
#18  Short offline       Completed without error       00%     60817         -
#19  Short offline       Completed without error       00%     60649         -
#20  Short offline       Completed without error       00%     60481         -
#21  Extended offline    Completed without error       00%     60349         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.


Code:
smartctl 7.2 2020-12-30 r5155 [FreeBSD 12.2-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    WD-WCC4E1628473
LU WWN Device Id: 5 0014ee 25f6efbb5
Firmware Version: 80.00A80
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Aug  3 15:03:08 2021 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)    Offline data collection activity
                    was never started.
                    Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)    The previous self-test routine completed
                    without error or no self-test has ever
                    been run.
Total time to complete Offline
data collection:         (52080) seconds.
Offline data collection
capabilities:              (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    Conveyance Self-test supported.
                    Selective Self-test supported.
SMART capabilities:            (0x0003)    Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01)    Error logging supported.
                    General Purpose Logging supported.
Short self-test routine
recommended polling time:      (   2) minutes.
Extended self-test routine
recommended polling time:      ( 521) minutes.
Conveyance self-test routine
recommended polling time:      (   5) minutes.
SCT capabilities:            (0x703d)    SCT Status supported.
                    SCT Error Recovery Control supported.
                    SCT Feature Control supported.
                    SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   179   179   021    Pre-fail  Always       -       8041
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       106
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       2
  9 Power_On_Hours          0x0032   014   014   000    Old_age   Always       -       63326
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       40
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       20
193 Load_Cycle_Count        0x0032   184   184   000    Old_age   Always       -       49366
194 Temperature_Celsius     0x0022   113   106   000    Old_age   Always       -       39
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     63274         -
# 2  Short offline       Completed without error       00%     63167         -
# 3  Short offline       Completed without error       00%     62999         -
# 4  Short offline       Completed without error       00%     62831         -
# 5  Short offline       Completed without error       00%     62664         -
# 6  Extended offline    Completed without error       00%     62530         -
# 7  Short offline       Completed without error       00%     62448         -
# 8  Short offline       Completed without error       00%     62280         -
# 9  Short offline       Completed without error       00%     62113         -
#10  Short offline       Completed without error       00%     61944         -
#11  Extended offline    Completed without error       00%     61813         -
#12  Short offline       Completed without error       00%     61705         -
#13  Short offline       Completed without error       00%     61537         -
#14  Short offline       Completed without error       00%     61369         -
#15  Short offline       Completed without error       00%     61201         -
#16  Extended offline    Completed without error       00%     61069         -
#17  Short offline       Completed without error       00%     60985         -
#18  Short offline       Completed without error       00%     60817         -
#19  Short offline       Completed without error       00%     60650         -
#20  Short offline       Completed without error       00%     60482         -
#21  Extended offline    Completed without error       00%     60349         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

Thanks in advance! :smile:
 
P

_Paul

Cadet
Joined
Aug 3, 2021
Messages
3
.. small update:

Code:
dd if=/dev/urandom of=/mnt/Storage/NAS/test.bs bs=1M count=5000
5000+0 records in
5000+0 records out
5242880000 bytes transferred in 37.831240 secs (138585995 bytes/sec)


so dd returns 138mb/s write speed on the dataset - just why am I not able to get these speeds over any of the sharing services like SMB oder RSYNC over a wired connection? :-(
 
P

_Paul

Cadet
Joined
Aug 3, 2021
Messages
3
OK; this topic can be closed. Turns out it's a faulty cable or switch, as I'm no longer able to reproduce gigabit networking speed. Guess it's not the NAS to blame.
 
sretalla

sretalla

Powered by Neutrality
Moderator
Joined
Jan 1, 2016
Messages
9,703
What is your rsync managing... perhaps it's bound up in metadata.

You could consider a metadata only L2ARC setup to see if that helps.

L2ARC impact on rsync performance for largely dormant data

I've been doing some more testing and the evidence suggests that using a L2ARC with a metadata only flag has a potential substantial positive impact on rsync performance over AFP. For largely dormant data, the combination of L2ARC dedicated to metadata seems to benefit rsync performance a lot...
www.truenas.com www.truenas.com
 
jgreco

jgreco

Resident Grinch
Joined
May 29, 2011
Messages
18,680
_Paul said:
OK; this topic can be closed. Turns out it's a faulty cable or switch, as I'm no longer able to reproduce gigabit networking speed. Guess it's not the NAS to blame.
Click to expand...

Thread closed per user request. :smile:
 
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