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Zero Bytes after a few seconds
We've been receiving a strange zero bytes issue when saving files. We are running a few iMacs on the network, it's a mix machines running MacOS Monterey down to High Sierra. We can save a varie...
pdaly12 wrote:
Can I safely assume the issue is caused by hard drive 2 and 4 and they need replacing? (but not at the same time as we are using RAID5)
Well, disk 3 also has issues worth looking into. Personally I'd take a disk with 60 reallocated sectors out of service (though there likely are folks here who'd disagree with that).
Have you downloaded the full log zip file, and looked for BTRFS and disk errors?
Is there any particular log that I should concentrate on. i.e. system.log (system log only has todays events).
Smart Log suggests a load of sector re-writes back in December, but nothing for yesterday (when we last experienced zero bytes)
Does your hunch suggest that it is a disk I/O issue that would cause this? it was a mild issue a year ago after an upgrade to the latest firmware, so we rolled back it was still happening. We then thought that Samba was causing it due to one mac being upgraded to the latest MacOS a few weeks prior, so we switched to AFP and it was rarely happening. However its become rife at the moment. I'll order 2 HD's for now. maybe order another if we still have the issue as disk 3 is reallocating successfully and theoretically that shouldnt be causing so many issues. Disk 2 is my primary concern as the errors suggest failure soon.
pdaly12 wrote:
Is there any particular log that I should concentrate on. i.e. system.log (system log only has todays events).
system.log, kernel.log, systemd-journal.log
If you have ssh enabled, you can log into the NAS and run smartctl -x /dev/sdxx
That will show the disk's error log (including UNCs that don't seem to show up other places). https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Disk-test-running-10-days-already/td-p/1786277
If I'm right, based on the SMART data, it seems disks 3 & 4 need to be replaced as they're receiving high error rate - drive 4 being the worst (I can't bear to look at the raw value forRaw_Read_Error_Rate on drive 4).
I think Disc 2 needs to be replaced as its suffering with Offline_Uncorrectable issues. which suggests its going to fail soon.
I also discovered that drive 4 is not a NAS drive, its a normal PC drive, so Ive no idea who put that in there!!! humph!
Disk 1
No Errors LoggedSMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 1 3 Spin_Up_Time POS--K 170 165 021 - 4458 4 Start_Stop_Count -O--CK 092 092 000 - 8389 5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0 7 Seek_Error_Rate -OSR-K 200 200 000 - 0 9 Power_On_Hours -O--CK 001 001 000 - 89392 10 Spin_Retry_Count -O--CK 100 100 000 - 0 11 Calibration_Retry_Count -O--CK 100 100 000 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 299 192 Power-Off_Retract_Count -O--CK 200 200 000 - 53 193 Load_Cycle_Count -O--CK 198 198 000 - 8335 194 Temperature_Celsius -O---K 106 098 000 - 41 196 Reallocated_Event_Count -O--CK 200 200 000 - 0 197 Current_Pending_Sector -O--CK 200 200 000 - 0 198 Offline_Uncorrectable ----CK 200 200 000 - 0 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 1 200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 32 ||||||_ K auto-keep |||||__ C event count ||||___ R error rate |||____ S speed/performance ||_____ O updated onlineDisk 2
No Errors LoggedID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 1 3 Spin_Up_Time POS--K 172 169 021 - 4358 4 Start_Stop_Count -O--CK 092 092 000 - 8118 5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0 7 Seek_Error_Rate -OSR-K 200 200 000 - 0 9 Power_On_Hours -O--CK 009 009 000 - 66510 10 Spin_Retry_Count -O--CK 100 100 000 - 0 11 Calibration_Retry_Count -O--CK 100 100 000 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 135 192 Power-Off_Retract_Count -O--CK 200 200 000 - 38 193 Load_Cycle_Count -O--CK 198 198 000 - 8079 194 Temperature_Celsius -O---K 101 094 000 - 46 196 Reallocated_Event_Count -O--CK 200 200 000 - 0 197 Current_Pending_Sector -O--CK 200 200 000 - 25 198 Offline_Uncorrectable ----CK 200 200 000 - 24 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 1 200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 33 ||||||_ K auto-keep |||||__ C event count ||||___ R error rate |||____ S speed/performance ||_____ O updated online |______ P prefailure warningDisk 3
Error count 3ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 3229 3 Spin_Up_Time POS--K 171 168 021 - 4441 4 Start_Stop_Count -O--CK 092 092 000 - 8333 5 Reallocated_Sector_Ct PO--CK 198 198 140 - 60 7 Seek_Error_Rate -OSR-K 200 200 000 - 0 9 Power_On_Hours -O--CK 001 001 000 - 88526 10 Spin_Retry_Count -O--CK 100 100 000 - 0 11 Calibration_Retry_Count -O--CK 100 100 000 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 289 192 Power-Off_Retract_Count -O--CK 200 200 000 - 53 193 Load_Cycle_Count -O--CK 198 198 000 - 8279 194 Temperature_Celsius -O---K 102 097 000 - 45 196 Reallocated_Event_Count -O--CK 145 145 000 - 55 197 Current_Pending_Sector -O--CK 200 200 000 - 0 198 Offline_Uncorrectable ----CK 200 200 000 - 0 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0 200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 0
All Disk 3 errors are similar to:
40 -- 51 05 40 00 00 3f 3b 24 58 40 00 Error: UNC at LBA = 0x3f3b2458 = 1060840536
Disk 4
Device error count: 56ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate PO-R-- 099 099 016 - 131073 2 Throughput_Performance P-S--- 137 137 054 - 91 3 Spin_Up_Time POS--- 119 119 024 - 318 (Average 319) 4 Start_Stop_Count -O--C- 099 099 000 - 6582 5 Reallocated_Sector_Ct PO--CK 100 100 005 - 11 7 Seek_Error_Rate PO-R-- 100 100 067 - 0 8 Seek_Time_Performance P-S--- 132 132 020 - 34 9 Power_On_Hours -O--C- 092 092 000 - 62247 10 Spin_Retry_Count PO--C- 100 100 060 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 1127 192 Power-Off_Retract_Count -O--CK 095 095 000 - 6831 193 Load_Cycle_Count -O--C- 095 095 000 - 6831 194 Temperature_Celsius -O---- 157 157 000 - 38 (Min/Max 7/49) 196 Reallocated_Event_Count -O--CK 100 100 000 - 12 197 Current_Pending_Sector -O---K 100 100 000 - 0 198 Offline_Uncorrectable ---R-- 100 100 000 - 0 199 UDMA_CRC_Error_Count -O-R-- 200 200 000 - 54
Again, typical errors recorded are:
ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 51 05 40 00 00 3f 3b 24 58 40 00 Error: UNC at LBA = 0x3f3b2458 = 1060840536
pdaly12 wrote:
ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 51 05 40 00 00 3f 3b 24 58 40 00 Error: UNC at LBA = 0x3f3b2458 = 1060840536
The times can be very useful here (though you have to translate them from power-on hours to actual time).
Also, after you replace the disks, I suggest setting up a maintenance schedule (settings wheel of the volume). You can schedule
- defrag
- balance
- scrub
- disk test
Personally I run one of these each month (cyclling through all 4 3X a year).
Definitely wait until you have healthy disks installed though.
Thanks for the help. The more I think about it, the more it seems to be that the drives are failing (slow directory listings, phantom invisible files appearing, etc) so I've ordered some Seagate Iron Wolf's.
Drive 4 had 131073 Raw Read errors and a few Smart "UNC at LBA" Errors ,
Drive 3 was identical to drive 4, but with 3229 raw read errors.Drive 2 had zero errors but that Uncorrectable Sector count: 24 is a cause for concern.
Drive 1 is a badass just chugging away leading the pack.
Because each re-sync puts a strain on the drives, the chances you will have another drive fail during re-sync is high with those drives. Make sure you have your backup up to date before you start swapping.
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