Marcelo Leal writes:
> Hello all,
> Somedays ago i was looking at the code and did see some variable that
> seems to make a correlation between the size of the data, and if the
> data is written to the slog or directly to the pool. But i did not
> find it anymore, and i think is way more complex than that.
> For example, if we have a pool of just two disks, it's fine to write
> to the slog (SSD). But if we have a 20 disks pool, write to the slog
> will not be a good idea, don't you agree? But if someone has that
> configuration (20 disks and a slog), the ZFS code would not identify
> that, and write directly to the pool?
> I'm asking this because i did some tests and seems like the SSD
> became a bottleneck... and i guess that even if the admin did make
> such mistake, the ZFS had the logic to avoid write to the intent log.
>
> Thanks a lot for your time!
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Hi Marcelo, you are right on and this is being tracked as :
6706578 a single zil writer should not abuse the slog
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6706578
Sun Storage 7000 line does already have a fix for this.
-r
http://blogs.sun.com/mws/entry/introducing_the_sun_storage_7000
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