[smartmontools-support] Too many ECC delayed counts in a SAS HDD

[Homer Li]

Hello
        There are a lot of ECC delayed errors in this HDD.

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes
  Total
               ECC          rereads/    errors   algorithm      processed
  uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9
bytes]  errors
read:          0    97324         0     97324    2458013      56433.789
       0
write:         0       19         0        19     138973      77418.803
       0
verify:        0        0         0         0     342815          0.000
       0


In this page: http://sg.danny.cz/scsi/smartmontools_scsi.html

It 's said"With possible delay" means the correction took longer than a
sector time so that reading/writing of subsequent sectors was delayed (e.g.
a lost revolution). The counter is incremented once for each logical block
that requires correction. "

What means "a sector time"?
Thanks.


Here is full ouput:
smartctl -x /dev/sdbc
smartctl 6.2 2013-07-26 r3841
[x86_64-linux-3.10.0-693.2.2.el7_lustre.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Vendor:               HGST
Product:              HUS726060AL5210
Revision:             AD05
User Capacity:        6,001,175,126,016 bytes [6.00 TB]
Logical block size:   512 bytes
Physical block size:  4096 bytes
Lowest aligned LBA:   0
Logical block provisioning type unreported, LBPME=0, LBPRZ=0
Rotation Rate:        7200 rpm
Form Factor:          3.5 inches
Logical Unit id:      0x5000ccaXXXXXXXXX
Serial number:        XXXXXXX
Device type:          disk
Transport protocol:   SAS
Local Time is:        Wed Nov 22 00:32:59 2017 EST
SMART support is:     Available - device has SMART capability.
SMART support is:     Enabled
Temperature Warning:  Enabled
Read Cache is:        Enabled
Writeback Cache is:   Enabled

=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK

Current Drive Temperature:     40 C
Drive Trip Temperature:        85 C

Manufactured in week 02 of year 2016
Specified cycle count over device lifetime:  50000
Accumulated start-stop cycles:  3
Specified load-unload count over device lifetime:  600000
Accumulated load-unload cycles:  96
Elements in grown defect list: 0

Vendor (Seagate) cache information
  Blocks sent to initiator = 9556280238669824

Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes
  Total
               ECC          rereads/    errors   algorithm      processed
  uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9
bytes]  errors
read:          0    97324         0     97324    2458013      56433.789
       0
write:         0       19         0        19     138973      77418.803
       0
verify:        0        0         0         0     342815          0.000
       0

Non-medium error count:        0

No self-tests have been logged

Background scan results log
  Status: waiting until BMS interval timer expires
    Accumulated power on time, hours:minutes 2738:27 [164307 minutes]
    Number of background scans performed: 15,  scan progress: 0.00%
    Number of background medium scans performed: 15

Protocol Specific port log page for SAS SSP
relative target port id = 1
  generation code = 2
  number of phys = 1
  phy identifier = 0
    attached device type: expander device
    attached reason: power on
    reason: unknown
    negotiated logical link rate: reserved [11]
    attached initiator port: ssp=0 stp=0 smp=1
    attached target port: ssp=0 stp=0 smp=1
    SAS address = 0x5000cca24d268c15
    attached SAS address = 0x5000ccab0202c77e
    attached phy identifier = 47
    Invalid DWORD count = 0
    Running disparity error count = 0
    Loss of DWORD synchronization = 0
    Phy reset problem = 0
    Phy event descriptors:
     Invalid word count: 0
     Running disparity error count: 0
     Loss of dword synchronization count: 0
     Phy reset problem count: 0
relative target port id = 2
  generation code = 2
  number of phys = 1
  phy identifier = 1
    attached device type: expander device
    attached reason: power on
    reason: unknown
    negotiated logical link rate: reserved [11]
    attached initiator port: ssp=0 stp=0 smp=1
    attached target port: ssp=0 stp=0 smp=1
    SAS address = 0x5000cca24d268c16
    attached SAS address = 0x5000ccab0202c7fe
    attached phy identifier = 47
    Invalid DWORD count = 0
    Running disparity error count = 0
    Loss of DWORD synchronization = 0
    Phy reset problem = 0
    Phy event descriptors:
     Invalid word count: 0
     Running disparity error count: 0
     Loss of dword synchronization count: 0
     Phy reset problem count: 0

-- 
Best Regards
Homer Li
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