Recreated array/config has extremely slow parity check on first attempt


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I just fully recreated my array after clearing all partitions and issuing a new config. I assigned all disks to the array and ran the format but the initial parity check after array boot is running extremely slowly (10 MBps or slower that dips down to 1 MBps frequently). I have already used the DiskSpeed docker plugin to verify all disks are operating at appropriate speeds and cannot figure out where the slow down is coming from. I would appreciate any help that can be given.
Array is 11+1 8TB drives with the 1 as parity.image.thumb.png.d73cfcdfeef8a109cb4d7f7ae8db1347.png

Edited by teddyschell91
misstype
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Feb 22 11:51:18 LilAnton kernel: sd 1:0:1:0: Power-on or device reset occurred
Feb 22 11:51:18 LilAnton kernel: sd 1:0:2:0: Power-on or device reset occurred
Feb 22 11:53:45 LilAnton kernel: sd 1:0:3:0: Power-on or device reset occurred

 

Issues with multiple disks, these usually mean a power/connection issue.

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7 hours ago, JorgeB said:
Feb 22 11:51:18 LilAnton kernel: sd 1:0:1:0: Power-on or device reset occurred
Feb 22 11:51:18 LilAnton kernel: sd 1:0:2:0: Power-on or device reset occurred
Feb 22 11:53:45 LilAnton kernel: sd 1:0:3:0: Power-on or device reset occurred

 

Issues with multiple disks, these usually mean a power/connection issue.

That may have been intentional based on the timeframe, I think when I saw initial slowness I paused the parity then issued a reboot on the host. That aside when I pulled it up this morning the speeds appear to have increased dramatically. Perhaps just an issue with early steps in the parity?
image.thumb.png.901887428fa10f2f9055937ffc60c500.png

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4 minutes ago, Rysz said:

 

Also check power connections esp. if you are using power splitters or recently changed something around.

No recent changes at the moment, I do have I think two SATA power extensions to add 4 more connections off the existing SATA chain cable. Maybe one is loose.

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