[zfs-discuss] zfs large pool - many checksum errors, no read or write errors

Badi' Abdul-Wahid abdulwahidc at gmail.com
Mon May 16 12:36:43 EDT 2016

Francois Stark <francois at postmasters.co.za> writes:

> ... Thanks for the suggestion - but wouldn't I be getting read or write errors?
> I am only getting ZFS checksum errors - no read or write errors. I also don't see any errors in the kernel for the disks.
> Can you paste the kind of errors you have found with the WD disks?

Sure, I'll send it this evening when I get a chance.

> Thanks
> ________________________________________
> From: zfs-discuss [zfs-discuss-bounces at list.zfsonlinux.org] On Behalf Of Badi' Abdul-Wahid 
> Sent: 16 May 2016 04:27 PM
> This looks similar to something I see on my system.
> I've got a couple of the WD FFSX drives (same as yours but 7200rpm).
> Do you see any errors in your kernel logs regarding these disks?
> For me, libata reports bad sectors and I can always reproduce these errors when doing a dd test or a scrub.
> After a few minutes, the link speed gets downgraded from 6 to 3 Gbps and the issue subsides.
> I've been able to "hide" the problem by setting libata.force=3 in the kernel parameters during boot.
> Can you pull a couple out and connect them directly to the motherboard?
> When I tested this, skipping the backplane board, the issue disappeared as well.
> At this point I'm in the process of replacing my WD Red drives.
> My guess at this point is that the vibration is beyond what the disks can handle, despite the manufacturer claims.
> FWIW, my pool is a mix of WD, HGST, and Seagate disks in 3 mirrors of two disks.

Badi' Abdul-Wahid

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