1st Parity avg Sync 28mbps, 2nd parity avg sync 6-14mbps

[karlpox]

Hi,

 

I recently manually sync my single parity drive (3TB Red currently running on SATA2 temporarily) because one of my drive has failed. With docker & VM services off, I was averaging 28.8mbps on summary but was reaching 40+mbps occasionally. Now I added a 4TB (still on SATA2) drive for dual parity and while currently syncing at the moment, I am averaging around 6-14mbps. I reached around 18mbps at the start of the process and was decreasing until the 6-14mbps range. 

 

Also upon parity sync completion Disk4 had 152 errors and I did an extended smart test on (successful without errors) it before the start of my 2 parity sync. And Disk2 had around 4K+ errors before but didn't had any errors anymore during the single parity sync it also passed the extended smart test. The 4TB 2nd parity drive also passed the ext smart test.

 

Does dual parity makes syncing slower? Or is there any problem with the setup besides the sata2 port being used.

sobnology-diagnostics-20180526-1417.zip

[JorgeB]

Disks 2 and 4 are failing and need to be replaced.

Most of your disks have a huge number of CRC errors, you want to make sure those are old errors and don't keep increasing, update to latest unRAID and make sure system notifications are enabled and you'll get a warning if ithey do.

[karlpox]

But during the single parity run it was fast, but when added the 2nd parity drive it became very slow. Is it possible that the high error counts is because of the marvell ports and other cheap sata controller I was using before? My 4TB has 16,967,174 and I just bought this 6months ago I think.

[JorgeB]

43 minutes ago, karlpox said:

Is it possible that the high error counts is because of the marvell ports and other cheap sata controller I was using before?

No, they are both failing, and you're previous disk2 rebuild is already corrupt due to the read errors on disk4.

[karlpox]

So how do I proceed from that? I replace disk 2 and 4 at the same time?

[JorgeB]

Yes if parity2 finished syncing without errors, if not better do a new config with new disks and copy everything you can from the old ones.

[karlpox]

Syncing still needs 3 days to finish. The error came up when it was about done on the single parity setup. Ill probably wait till my new lsi arrives before changing drives. Want to test the speed with them on.