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Parity check, EXTREMELY slow ~ 1.0 MB/sec

Featured Replies

unraid-diagnostics-20260301-1702.zipunraid-safemode-diagnostics-20260301-1733.zip

Hey, this is a new issue for me. leaning towards a hardware issue but unsure where to start.
I woke up this morning to my server being powered down for an unknown reason. it started a parity check when I booted it up which I was fine with due to not knowing the cause of the shutdown. came back a few hours later and noticed it hadn't even moved a percent.

Did a restart, no difference. Updated, safe/maintenance mode, no difference.
Dashboard is not showing any specific errors.

Any insight would be greatly appreciated.

Solved by trurl

  • Community Expert
  • Solution

You are having problems communicating with disk5. Check connections.

  • Community Expert

Marvell controllers have been NOT recommended for a long time.

  • Author
1 hour ago, trurl said:

You are having problems communicating with disk5. Check connections.

Looks like a sata cable swap has improved the speeds back to normal. I greatly appreciate the help!

  • Author

@trurl unraid-diagnostics-20260309-1805.zip

could you take a quick look at the attached diag? I assumed my sata card was the issue so I had ordered an LSI 9305 but it is a couple weeks ago and I wanted to try my best to not have something die on me so I just primed another sata card assuming I could at least run a parity check again without errors but with the new card it is also bum slow.

can I assume that there may be another issue at play? ram? power? other disks?

Let me know what you see. Currently I am not specifically noticing performance issues other than parity is basically not a thing speed wise.

  • Community Expert

What speed are you getting?

  • Community Expert

Are you not seeing ERRORS in the ERRORS column in MAIN - Array Devices for parity2 and disk2?

  • Author
47 minutes ago, trurl said:

Are you not seeing ERRORS in the ERRORS column in MAIN - Array Devices for parity2 and disk2?

nothing is showing on the gui as far as errors

image.png
Also speeds are going back down to down to 1MBs during parity checks. it goes in bursts and is not constant.
although for whatever reason as I opened obs to record it for you it's now maintaining 1gbs for at least 4 mins...

  • Community Expert

Possibly not the only issue, but first check/replace cables for those disks to try and get rid of the ATA errors, then post new diags during a check.

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