Neo_x Posted August 26, 2018 Share Posted August 26, 2018 Hi team any ideas as to why a parity sync will all of a sudden drop 50% in speed? i am trying to complete a parity rebuild to a new 8TB drive (tested with preclear before the time), and for the first +-13 hours it was performing admirably (roughly 35MB/s). since this afternoon however, it dropped to 10MB/s I dont have anything writing to or reading from the array, so it is really strange to see this : I have disabled anything extra (cahcdirs , and now for troubleshooting even the docker and VM services). No details in syslog as to a caused. can anybody maybe give an idea? not willing to wait 7 plus days for a parity sync to finish at current speeds , but also dont want to give up on 25% / 24 hours alread completed... TIA neo_X storage-diagnostics-20180826-2322.zip storage-diagnostics-20180826-2322.zip Link to comment
Squid Posted August 26, 2018 Share Posted August 26, 2018 38 minutes ago, Neo_x said: performing admirably (roughly 35MB/s). Personally, I'd consider that to be the low end of unacceptable But, with the age of your system, it might be as best as you can get... Other than that, your parity drive being reconstructed IS currently overheating. No clue though is that impacts write speeds or not ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate POSR-- 079 064 044 - 75318304 3 Spin_Up_Time PO---- 089 089 000 - 0 4 Start_Stop_Count -O--CK 100 100 020 - 6 5 Reallocated_Sector_Ct PO--CK 100 100 010 - 0 7 Seek_Error_Rate POSR-- 074 060 045 - 24152096 9 Power_On_Hours -O--CK 100 100 000 - 97 10 Spin_Retry_Count PO--C- 100 100 097 - 0 12 Power_Cycle_Count -O--CK 100 100 020 - 6 184 End-to-End_Error -O--CK 100 100 099 - 0 187 Reported_Uncorrect -O--CK 100 100 000 - 0 188 Command_Timeout -O--CK 100 100 000 - 0 189 High_Fly_Writes -O-RCK 100 100 000 - 0 190 Airflow_Temperature_Cel -O---K 037 035 040 NOW 63 (Min/Max 56/65 #8613) 191 G-Sense_Error_Rate -O--CK 100 100 000 - 849 192 Power-Off_Retract_Count -O--CK 100 100 000 - 2 193 Load_Cycle_Count -O--CK 100 100 000 - 32 194 Temperature_Celsius -O---K 063 065 000 - 63 (0 27 0 0 0) 195 Hardware_ECC_Recovered -O-RC- 079 005 000 - 75318304 197 Current_Pending_Sector -O--C- 100 100 000 - 0 198 Offline_Uncorrectable ----C- 100 100 000 - 0 199 UDMA_CRC_Error_Count -OSRCK 200 200 000 - 0 240 Head_Flying_Hours ------ 100 253 000 - 91 (8 9 0) 241 Total_LBAs_Written ------ 100 253 000 - 20626008160 242 Total_LBAs_Read ------ 100 253 000 - 46744423067 ||||||_ K auto-keep Link to comment
pwm Posted August 26, 2018 Share Posted August 26, 2018 65°C would be a warranty-breaking temperature for most HDD. You need to immediately fix this issue - hard disks doesn't really produce much heat but 10W of heat without moving air will result in very significant temperature increases. Your fans must move air over the drives. And preferably cool air sucked into the case and not air that has already been heated by the CPU, PSU, graphics card etc. Link to comment
Neo_x Posted August 27, 2018 Author Share Posted August 27, 2018 thx guys. i will put a temporary measure on to see if i can drop the temperature. currently air is being sucked over the drives and pushed through cpu and then out, so shouldn;t be an issue. might be that the fans is a bit low CFM, but will try to manage/upgrade witha controller. Link to comment
pwm Posted August 27, 2018 Share Posted August 27, 2018 2 hours ago, Neo_x said: thx guys. i will put a temporary measure on to see if i can drop the temperature. currently air is being sucked over the drives and pushed through cpu and then out, so shouldn;t be an issue. might be that the fans is a bit low CFM, but will try to manage/upgrade witha controller. Even slow fans would normally manage better - is it all drives that gets that hot, or do you have a some drives that have the air circulation blocked or isn't in the direct path of the moving air? Link to comment
Neo_x Posted September 2, 2018 Author Share Posted September 2, 2018 On 8/27/2018 at 10:43 PM, pwm said: Even slow fans would normally manage better - is it all drives that gets that hot, or do you have a some drives that have the air circulation blocked or isn't in the direct path of the moving air? must admit - stubborn me did not want to believe it, but seems like temperature was indeed the cause. just the stubborn, errr i mean loyal old server, wanted me to remove it from the server cabinet and put it right next to my bed before it started to complete a parity sync (combined with a massive 75 cm fan for the warmer times of day. i believe there is other possible issues afoot - possibly some of the controllers, as i had 4 drives drop out of the array yesterday during fan troubleshooting, which required me to run xfs_repair before i could mount them again. will monitor it closely i am getting a fan controller in the next week to see if i can manage the temperature a bit better as well. Thx for the help team! Link to comment
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