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hi I am having a 30drives unraid,and get this warning ,what shoud I do ,and how it happens its kind of scary ,I have so many file on this system. tower-diagnostics-20230626-1527.zip

I can get what you are takling about ... But here is the situation ,all the 8 drives are syncing now is in the dell 720xd server itself .There should be no conection issue, and even there is one ,how could it slow down to 14m/s now……

what kind of disk connection describ is better for understanding ,I am new…… sorry

the 13 drive is in a Dell R720XD server rack ,and the another 34 is in a supermicro disk chaise ,connect with SFF-8088 cable and hba card .

Thanks for your help here is the disk connection map Host bridge: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 DMI2 (rev 04) PCI bridge: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 2c (rev 04) RAID bus controller: Broadcom / LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03) 13 drives(left 13 in the picture ,main disks in parity sync situation) PCI bridge: Intel Corporation Xeon E7 v2/Xeon E5 v2/Core i7 PCI Express Root Port 3a (rev 04) Serial Attached SCSI controller: Broadcom / LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03) 34 drives and it is going down to 14m/s …… I cant figure out why this is happening ,all the 8 disk(2parity and 6 data disks) are in the first bus, and no background app is running .

Thanks a lot But I have done the Disk Speed test in docker ,the result shows the slowest one is 90mb/s ,and its not the disk in the array but the unassigned device which even did not mounted... So is there any other reason I can make some improvements.

Hi, I am getting a 80mb/s sync its quiet slow?or is it right? Here is the Diagnostics Please help me with this tower-diagnostics-20230523-1100.zip