mismatch_cnt is not 0 (RAID)

большое значение mismatch_cnt означает проблемы с дисками. И по возможности диски надо побыстрее заменить.

1) что на md2? какие файловые системы, своп есть?

2) "не равным 0" - значит равным чему??? Согласитесь, если 1 или 10 - это одно. Если 1000 - уже другое.

Короче, из вашего описания не факт - что есть реальная проблема. В нормальной ситуации такое также возможно, см.:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=405919

mismatch_cnt = 1024

swap 852k used

boot && tmp на md1 а все остальное на md2

Вполне возможно - дело именно в swap (хотя там еще несколько вариантов работы было, что приводят к аналогичному росту mismatch_cnt).

Но у меня после repair и check - все сбрасывается в ~0 (а при периодических проверках mismatch_cnt доходит до 100-200).

Чтобы успокоиться - разберитесь со smart дисков. Может там есть реальный повод волноваться. Если сервер арендуете - попросите заменить наиболее подозрительный диск и посмотрите что будет.

Покажите смарт (smartctl --all /dev/sda) всех винтов массива?

смарт ошибок не нашел. Если нужно могу показать всю информацию по смарт

Покажите. Любопытно понаблюдать, что Вам подскажут местные "специалисты".

Давайте последний раз определимся.

Это у Вас сразу после repair & check? Или только по прошествии сравнительно продолжительного времени после? Если последнее - то волноваться особо точно нет причины, это именно ситуация, описаная в баге.

mismatch_cnt = 1024 было до рипеа и сразу после и есть сейчас.

Если из-за свапа такое то как свап привести к 0?

Сервер работает недели 2-3. mismatch_cnt стал не равным 0 и свап также только несколько дней назад

palladium2010 добавил 14.10.2010 в 20:56

 smartctl --all /dev/sda

smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen

Home page is http://smartmontools.sourceforge.net/



=== START OF INFORMATION SECTION ===

Device Model:     SAMSUNG HD754JJ

Serial Number:    S281J90Z500142

Firmware Version: 1AJ10001

User Capacity:    750,156,374,016 bytes

Device is:        In smartctl database [for details use: -P show]

ATA Version is:   8

ATA Standard is:  Not recognized. Minor revision code: 0x28

Local Time is:    Thu Oct 14 20:55:20 2010 MSD



==> WARNING: May need -F samsung or -F samsung2 enabled; see manual for details.



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:                 (6900) seconds.

Offline data collection

capabilities:                    (0x5b) SMART execute Offline immediate.

                                        Auto Offline data collection on/off support.

                                        Suspend Offline collection upon new

                                        command.

                                        Offline surface scan supported.

                                        Self-test supported.

                                        No 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:        ( 115) minutes.

SCT capabilities:              (0x003f) SCT Status 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   100   100   051    Pre-fail  Always       -       1

  2 Throughput_Performance  0x0026   053   053   000    Old_age   Always       -       6626

  3 Spin_Up_Time            0x0023   070   070   025    Pre-fail  Always       -       9325

  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       4

  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail  Always       -       0

  7 Seek_Error_Rate         0x002e   252   252   051    Old_age   Always       -       0

  8 Seek_Time_Performance   0x0024   252   252   015    Old_age   Offline      -       0

  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       471

 10 Spin_Retry_Count        0x0032   252   252   051    Old_age   Always       -       0

 11 Calibration_Retry_Count 0x0032   252   252   000    Old_age   Always       -       0

 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       4

191 G-Sense_Error_Rate      0x0022   252   252   000    Old_age   Always       -       0

192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age   Always       -       0

194 Temperature_Celsius     0x0002   064   062   000    Old_age   Always       -       36 (Lifetime Min/Max 19/39)

195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age   Always       -       0

196 Reallocated_Event_Count 0x0032   252   252   000    Old_age   Always       -       0

197 Current_Pending_Sector  0x0032   252   252   000    Old_age   Always       -       0

198 Offline_Uncorrectable   0x0030   252   252   000    Old_age   Offline      -       0

199 UDMA_CRC_Error_Count    0x0036   200   200   000    Old_age   Always       -       0

200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age   Always       -       17174

223 Load_Retry_Count        0x0032   252   252   000    Old_age   Always       -       0

225 Load_Cycle_Count        0x0032   100   100   000    Old_age   Always       -       4



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%       381         -



SMART Selective Self-Test Log Data Structure Revision Number (0) should be 1

SMART Selective self-test log data structure revision number 0

Warning: ATA Specification requires selective self-test log data structure revision number = 1

 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS

    1        0        0  Completed [00% left] (0-65535)

    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.

smartctl --all /dev/sdb
smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Device Model:     SAMSUNG HD754JJ
Serial Number:    S281J90Z500139
Firmware Version: 1AJ10001
User Capacity:    750,156,374,016 bytes
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  Not recognized. Minor revision code: 0x28
Local Time is:    Thu Oct 14 20:56:46 2010 MSD

==> WARNING: May need -F samsung or -F samsung2 enabled; see manual for details.

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:                 (6780) seconds.
Offline data collection
capabilities:                    (0x5b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        No 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:        ( 113) minutes.
SCT capabilities:              (0x003f) SCT Status 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   100   100   051    Pre-fail  Always       -       84
  2 Throughput_Performance  0x0026   052   052   000    Old_age   Always       -       6706
  3 Spin_Up_Time            0x0023   070   070   025    Pre-fail  Always       -       9285
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       4
  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   252   252   051    Old_age   Always       -       0
  8 Seek_Time_Performance   0x0024   252   252   015    Old_age   Offline      -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       471
 10 Spin_Retry_Count        0x0032   252   252   051    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   252   252   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       4
191 G-Sense_Error_Rate      0x0022   252   252   000    Old_age   Always       -       0
192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age   Always       -       0
194 Temperature_Celsius     0x0002   064   064   000    Old_age   Always       -       32 (Lifetime Min/Max 18/35)
195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age   Always       -       0
196 Reallocated_Event_Count 0x0032   252   252   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   252   252   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   252   252   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0036   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age   Always       -       27576
223 Load_Retry_Count        0x0032   252   252   000    Old_age   Always       -       0
225 Load_Cycle_Count        0x0032   100   100   000    Old_age   Always       -       4

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%       441         -

SMART Selective Self-Test Log Data Structure Revision Number (0) should be 1
SMART Selective self-test log data structure revision number 0
Warning: ATA Specification requires selective self-test log data structure revision number = 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Completed [00% left] (0-65535)
    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.

В принципе, своп - только один вариант, приводящий к mismatch_cnt != 0 в "нормальной" ситуации.

Отключите swap или /proc/sys/vm/swappiness поменьше сделайте. repair & check - и посмотрите что будет.