During coping data from my Unraid server to an external harddrive the Unraid server froze up. Did restart it and now parity check running speed is between 0 - 3 MB/sec where it normally is 100 - 130 MB/sec or more. Did run the disk speed check docker and all disk looks OK with regard to speed versus place at harddrive. All in the 120 - 150 MB/sec as I did expect. Did run SMART quick test at all my harddrives and all ended with "no errors to report". In the log file I see this;

ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 310)                                                             
ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.SPT2._GTF.DSSP], AE_NOT_FOUND (20200925/psargs-330)
ACPI Error: Aborting method \_SB.PCI0.SAT0.SPT2._GTF due to previous error (AE_NOT_FOUND) (20200925/psparse-529)   
ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.SAT0.SPT2._GTF.DSSP], AE_NOT_FOUND (20200925/psargs-330)
ACPI Error: Aborting method \_SB.PCI0.SAT0.SPT2._GTF due to previous error (AE_NOT_FOUND) (20200925/psparse-529)   
 

I can write data to the Unraid server at ~113 MB/sec as usual (it has cache drives). I can read data from the Unraid server at normal speed. 

 

... but as soon as I start parity check then it only runs at 0 - 3 MB/sec and will last for 10 - 40 days where it normally takes ~8 hours. 

 

Have added the diagnostics file. Please help as I cannot figure out what is wrong. Any help is highly appreciated.

svgmain-diagnostics-20220320-1914.zip

Check/replace cables on disks 1 and 2 and post new diags.

Did replace the sata cables and reattached the power cabels ..... and I "hate" to say you are right as I feel like a fool. Now parity check  runs at 130 - 160 MB/sec speed as normal. Was there anything in the diagnostic files that indicated bad sata cables or power cables ?

thx a lot for the advice and 1000 thumbs up from me to you.

11 hours ago, chsvfr said:

Was there anything in the diagnostic files that indicated bad sata cables or power cables ?

There were constant ATA errors for both disks.