hi guys,

does anyone know if a fix for this (space map thrashing) is in the
works?  i've been running into this on and off on a number of systems
i manage.  sometimes i can delete snapshots and things go back to
normal, sometimes the only thing that works is enabling
metaslab_debug.  obviously the latter is only really an option for
systems with a huge amount of ram.

or: am i doing something wrong?


On Mon, Dec 19, 2011 at 8:02 AM, Jim Klimov <jimkli...@cos.ru> wrote:
> 2011-12-15 22:44, milosz цкщеу:
>>> There are a few metaslab-related tunables that can be tweaked as well.
>>>                                        - Bill
> For the sake of completeness, here are the relevant lines
> I have in /etc/system:
> ******
> * fix up metaslab min size (recent default ~10Mb seems bad,
> * recommended return to 4Kb, we'll do 4*8K)
> * greatly increases write speed in filled-up pools
> set zfs:metaslab_min_alloc_size = 0x8000
> set zfs:metaslab_smo_bonus_pct = 0xc8
> ******
> These values were described in greater detail on the list
> this summer, I think.
> HTH,
> //Jim
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