Re: seeing data corruption with zfs trim functionality

[Steven Hartland]

----- Original Message -----
From: "Steven Hartland" <kil...@multiplay.co.uk>
>
> After initially seeing not issues, our overnight monitoring started moaning
> big time on the test box. So we checked and there was zpool corruption as well
> as a missing boot loader and a corrupt GPT, so I believe we have reproduced
> your issue.
>
> After recovering the machine I created 3 pools on 3 different disks each
> running a different delete_method.
>
> We then re-ran the tests which resulted in the pool running with delete_method
> WS16 being so broken it had suspended IO. A reboot resulted in it once again
> reporting no partition table via gpart.
>
> A third test run again produced a corrupt pool for WS16.
>
> I've conducted a preliminary review of the CAM WS16 code path along with SBC-3
> spec which didn't identify any obvious issues.
>
> Given we're both using LSI 2008 based controllers it could be FW issue specific
> to WS16 but that's just speculation atm, so I'll continue to investigate.
>
> If you could re-test you end without using WS16 to see if you can reproduce the
> problem with either UNMAP or ATA_TRIM that would be a very useful data point.

After much playing I narrow down a test case of one delete which was causing
disc corruption for us (deleted the partition table instead of data in
the middle of the disk).

The conclusion is LSI 2008 HBA with FW below P13 will eat the data on your SATA
disks if you use WS16 due to the following bug:-
SCGCQ00230159 (DFCT) - Write same command to a SATA drive that doesn't support
SCT write same may write wrong region.

After updating here to P16, which we would generally be running, but test box
was new and hadnt updated yet the corruption issue is no longer reproducable.

So Ajit please check your FW version, I'm hoping to here your on something
below P13, P12 possibly?

If so then this is your issue, to fix simply update to P16 and the problem
should be gone.

Regards
Steve


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[Ajit Jain]

Hi Steven,

FW version on the setup is P15.
I will upgrade the FW to P16, but I think my
best bet will be to update code base to 9 stable as unlike you,
I was seeing corruption for all three delete methods.

thanks
ajit

> ==============================**==================

[Ajit Jain]

Sure Steven,
I'll apply the patches and update ASAP.

thanks
ajit


On Thu, May 23, 2013 at 3:03 PM, Steven Hartland <kil...@multiplay.co.uk>wrote:

> I've attacked the two patch sets I'm looking to MFC to stable-9, one
> adds BIO_DELETE CAM changes and the other is ZFS TRIM support.
>
> They should both apply cleanly to stable-9, if you could test with
> those on your machine and let me know.
>
> Regards
> Steve
>
> ----- Original Message ----- From: "Ajit Jain" <ajit...@cloudbyte.com>

>
>
> Hi Steven,
>>
>> FW version on the setup is P15.
>> I will upgrade the FW to P16, but I think my
>> best bet will be to update code base to 9 stable as unlike you,
>> I was seeing corruption for all three delete methods.
>>
>> thanks
>> ajit
>>
>> On Sat, May 18, 2013 at 4:15 AM, Steven Hartland <kil...@multiplay.co.uk

>> >**wrote:

>>> ==============================****==================