SSD-RAID hält Selbstgespräche?

tomcat8

New Member
Hallo,

hier habe ich ein Hetzner-System mit einem 512GB SSD-RAID

=== START OF INFORMATION SECTION ===
Model Family: Crucial/Micron MX1/2/300, M5/600, 1100 Client SSDs
Device Model: Micron_1100_MTFDDAK512TBN

Irgendwelche Fehler sind für mich nicht erkennbar.

Die Disk latency sieht dabei -äh- irgendwie "komisch" aus;
für die beiden Spitzen in der Grafik gibts eine Erklärung, da war wirklich Last auf dem System;
aber für diese merkwürdigen regelmäßigen Schwankungen bei sdb habe ich keine Erklärung.
Jemand eine Idee, was das sein könnte?
... bin ja nur neugierig ...
disk-latency.jpg
 

marce

Well-Known Member
Consistency-Check, lokale CronJobs, Fehldarstellung, ...

Was läuft dem auf dem Ding? Wie konfiguriert? Reines SW-Raid (sprich aus sda und sdb) oder sind sda / sdb exportiere LUN auf einem HD-Raid?, ...?
 

tomcat8

New Member
... das ist ein Software-RAID Level 1
Cron startet täglich um 6 Uhr mdadm:
mdadm --monitor --scan --oneshot
Das dauert aber nur wenige Minuten.
Bei Problemen gibts eine Mail an root; das war aber bisher nur ein einziges Mal der Fall.

Ansonsten sind da eine übersichtliche Zahl von Browser-Clients, die das System nicht wirklich belasten;
load liegt üblicherweise unter 0.1;
(von den seltenen Ausnahmen abgesehen - wie oben zu sehen).
 

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Die Latenz-Spikes hat ja nur sdb in dem Maße, ggf. hat diese einen weg. Wie sehen ihre SMART-Werte aus?

Hast du auch Messungen zu IOPS und Durchsatz? Im RAID sollte sich dies ja ziemlich gleichmäßig verteilen.
 

tomcat8

New Member
# smartctl -a /dev/sdb
smartctl 6.6 2017-11-05 r4594 [x86_64-linux-4.19.0-6-amd64] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family: Crucial/Micron MX1/2/300, M5/600, 1100 Client SSDs
Device Model: Micron_1100_MTFDDAK512TBN
Serial Number: 1713191CB64F
LU WWN Device Id: 5 00a075 1191cb64f
Firmware Version: M0MU031
User Capacity: 512.110.190.592 bytes [512 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Form Factor: 2.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Mon Dec 9 16:57:00 2019 CET
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: ( 1324) 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: ( 7) minutes.
Conveyance self-test routine
recommended polling time: ( 3) minutes.
SCT capabilities: (0x0035) 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 100 100 000 Pre-fail Always - 1
5 Reallocate_NAND_Blk_Cnt 0x0032 100 100 010 Old_age Always - 1
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 16591
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 9
171 Program_Fail_Count 0x0032 100 100 000 Old_age Always - 0
172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0
173 Ave_Block-Erase_Count 0x0032 096 096 000 Old_age Always - 68
174 Unexpect_Power_Loss_Ct 0x0032 100 100 000 Old_age Always - 6
183 SATA_Interfac_Downshift 0x0032 100 100 000 Old_age Always - 0
184 Error_Correction_Count 0x0032 100 100 000 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
194 Temperature_Celsius 0x0022 061 044 000 Old_age Always - 39 (Min/Max 27/56)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 1
197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 100 100 000 Old_age Always - 0
202 Percent_Lifetime_Used 0x0030 096 096 001 Old_age Offline - 4
206 Write_Error_Rate 0x000e 100 100 000 Old_age Always - 0
246 Total_Host_Sector_Write 0x0032 100 100 000 Old_age Always - 14507668068
247 Host_Program_Page_Count 0x0032 100 100 000 Old_age Always - 469399442
248 Bckgnd_Program_Page_Cnt 0x0032 100 100 000 Old_age Always - 1440284094
180 Unused_Reserve_NAND_Blk 0x0033 000 000 000 Pre-fail Always - 2467
210 Success_RAIN_Recov_Cnt 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 Short offline Completed without error 00% 16591 -
# 2 Vendor (0xff) Completed without error 00% 16552 -
# 3 Short offline Completed without error 00% 16303 -
# 4 Vendor (0xff) Completed without error 00% 16239 -
# 5 Vendor (0xff) Completed without error 00% 15898 -
# 6 Vendor (0xff) Completed without error 00% 15622 -
# 7 Vendor (0xff) Completed without error 00% 15348 -
# 8 Vendor (0xff) Completed without error 00% 15088 -
# 9 Vendor (0xff) Completed without error 00% 14828 -
#10 Vendor (0xff) Completed without error 00% 14542 -
#11 Vendor (0xff) Completed without error 00% 14250 -
#12 Vendor (0xff) Completed without error 00% 13947 -
#13 Vendor (0xff) Completed without error 00% 13669 -
#14 Vendor (0xff) Completed without error 00% 13407 -
#15 Vendor (0xff) Completed without error 00% 13144 -
#16 Vendor (0xff) Completed without error 00% 12847 -
#17 Vendor (0xff) Completed without error 00% 12571 -
#18 Vendor (0xff) Completed without error 00% 12310 -
#19 Vendor (0xff) Completed without error 00% 12057 -
#20 Vendor (0xff) Completed without error 00% 11806 -
#21 Vendor (0xff) Completed without error 00% 11541 -

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 Completed [00% left] (57881389-57946924)
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.
 

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Das sieht meines Erachtens beinahe einwandfrei aus.

Hast du auch Messungen zu IOPS und Durchsatz? :)
 
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