Hi,

we've had problems with the persistent l2arc feature pulled from the
nexenta repo. Please see

https://www.illumos.org/issues/7341

I'm still searching for a good way to fix this. Any help is greatly appreciated.

My favourite plan is to prevent those blocks from entering the l2arc in the
first place, but for this we would need a criterion l2arc_write_eligible could
check.
As far as I currently understand it the buffer got dirtied during the txg and
cleaned in the first sync pass. The second sync pass dirtied the buffer again,
which didn't assign a new DVA to the buffer, as it already got CoW'ed in this
txg. L2arc picked that block up right after the first sync pass.

Is there a way to detect this from l2arc_write_eligible?

Thanks,
Arne


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