Re: Hung RAID5 array with discard

[Peter Kieser <peter@xxxxxxxxx>]

On 2015-10-22 9:42 PM, Neil Brown wrote:
> Peter Kieser <peter@xxxxxxxxx> writes:
>
> > FYI I ran into this problem in 3.18.22 when forcing RAID5 TRIM support
> > w/ raid456.devices_handle_discard_safely on Intel DC S3500 SSDs.
> Can you please be precise about the problem you experienced.
> Complete kernel messages are a minimum.
> Anything interesting that might have been happening at the time might
> help.
>
> Thanks,
> NeilBrown

Same behaviour as the original poster. Enabled the module knob, then ran 
mkfs.ext4, which starts to do "Discarding device blocks" and then the 
machine hard locked. No kernel messages.

-Peter

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