seeing data corruption with zfs trim functionality

[Steven Hartland]

----- 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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