Op 09-05-11 15:42, Edward Ned Harvey schreef:
>> > in my previous
>> > post my arc_meta_used was bigger than my arc_meta_limit (by about 50%)
> I have the same thing. But as I sit here and run more and more extensive
> tests on it ... it seems like arc_meta_limit is sort of a soft limit. Or it
> only checks periodically or something like that. Because although I
> sometimes see size > limit, and I definitely see max > limit ... When I do
> bigger and bigger more intensive stuff, the size never grows much more than
> limit. It always gets knocked back down within a few seconds...
I found a script called arc_summary.pl and look what it says.
ARC Size:
Current Size: 1734 MB (arcsize)
Target Size (Adaptive): 1387 MB (c)
Min Size (Hard Limit): 637 MB (zfs_arc_min)
Max Size (Hard Limit): 5102 MB (zfs_arc_max)
c = 1512 MB
c_min = 637 MB
c_max = 5102 MB
size = 1736 MB
...
arc_meta_used = 1735 MB
arc_meta_limit = 2550 MB
arc_meta_max = 1832 MB
There are a dew seconds between running the script and ::arc | mdb -k,
but it seems that it just doesn't use more arc than 1734 or so MB, and
that nearly all of it is used for metadata. (I set primarycache=metadata
to my data fs, so I deem it logical). So the goal seems shifted to
trying to enlarge the arc size (what's it doing with the other memory???
I have close to no processes running.)
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