[SOLVED] Parity check taking too long (30hrs)


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The more sync errors the longer it will take, are theses errors expected?

 

 

Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993312
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993320
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993328
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993336
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993344
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993352
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993360
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993368
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993376
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993384
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993392
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993400
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993408
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993416
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993424
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993432
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993440
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993448
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993456
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993464
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993472
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993480
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993488
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993496
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993504
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993512
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993520
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993528
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993536
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993544
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993552
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993560
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993568
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993576
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993584
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993592
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993600
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993608
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993616
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993624
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993632
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993640
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993648
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993656
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993664
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993672
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993680
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993688
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993696
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993704
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993712
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993720
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993728
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993736
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993744
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993752
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993760
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993768
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993776
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993784
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993792
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993800
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993808
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993816
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993824
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993832
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993840
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993848
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993856
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993864
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993872
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993880
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993888
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993896
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993904
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993912
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993920
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993928
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993936
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993944
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993952
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993960
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993968
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993976
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993984
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18993992
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994000
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994008
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994016
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994024
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994032
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994040
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994048
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994056
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994064
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994072
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994080
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994088
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994096
Jul 29 07:32:37 gaia kernel: md: correcting parity, sector=18994104
Jul 29 07:32:37 gaia kernel: md: correcting parity, stopped logging

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Looks like you assigned all your disks then started a parity check instead of a parity sync. Maybe you could tell us a little more about how you got to this point. As johnnie mentioned correcting a lot of parity errors will take a long time. If you had done a parity sync it would have just written parity, but with a parity check it has to read, check, then write parity.

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This is what I did:

[*] Installed 3 drives, one parity, two data drives. No cache drive.

[*] Created two shares, movies and tvshows, and fill the shares from another server.

[*] Run a parity check

Did you start the array and let it build parity after installing the drives?
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I believe I didn't.... Since drives were empty I assumed I didn't have to.

Drives are never empty unless they have just been pre-cleared - they just do not have useful data on them

 

And now that I think about it, I don't think the parity drive was empty  :-[
The existing contents of a parity drive are irrelevant - but you do need to do a parity sync the first time to create a valid parity.
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