seeing data corruption with zfs trim functionality

[Ajit Jain]

Hi Steven,

Freebsd Version: 9

SSD: Seagate SSD, complete smartctl output is attached with the mail.
Not sure if I could provide the SSD information that you were looking for.
If not, could you please tell me command (if any) to get the information.

LSI card:
mpslsi0 at pci0:2:0:0:     class=0x010700 card=0x30801000 chip=0x00721000
rev=0x03 hdr=0x00
    vendor     = 'LSI Logic / Symbios Logic'
    device     = 'SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon]'
    class      = mass storage
    subclass   = SAS

Complete pciconf -lv output is attached with mail.


thanks
ajit



On Mon, Apr 29, 2013 at 1:52 PM, Steven Hartland <killing at multiplay.co.uk>wrote:

> ----- Original Message ----- From: "Ajit Jain" <ajit.jain at cloudbyte.com>
>
>
>  I am running zfs with trim functionality (ported from head). Seeing data
>> corruption when running iotest* with multiple threads (never saw data
>> corruption with single thread).
>>
>> The patches merged to add trim support are as follows:
>> 1. 240868  (zfs trim patch)
>> 2. 230053 and 245252 (block device driver trim support)
>> 3. 239655 (fix an issue in patch 230053)
>>
>> I am "NOT" seeing data corruption in the following cases:
>> 1. Running iotest with single thread (Trim is enabled at entire io stack).
>> 2. Trim is enabled at zfs layer but disable at driver layer i.e. delete
>> method is set to NONE (even with multiple threads).
>>
>>
>> Since patch 240868 alone was not working as I pulled in additional zfs
>> trim
>> patches 244155, 244187, 244188, 248572 (however I am not using separate
>> L2arc device), 248573, 248574, 248575 and 248576. Still I am seeing the
>> same issue.
>>
>> Issue: After some time running with multiple thread write system call
>> return sometimes with EIO or 122 (checksum error) error code.
>>
>> I looked at GEOM code a bit I think it already has the trim (DELETE)
>> command support. Still I am doubtful if I have pulled in all required
>> patches in the entire I/O stack.
>>
>> I am using a LSI SAS HBA card to connect to the SSD, firmware seems to
>> claim the support for trim.
>>
>> *iotest: non standard freebsd FreeBSD utility, which creates files and
>> does
>> I/O on the files and can be invoked in single/multithread mode to do the
>> I/O.
>>
>
> What version are you porting the changes to?
>
> What SSD are you using?
>
> What LSI controller are you using?
>
>    Regards
>    Steve
>
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