ZFS ARC vs Inactive memory on 10-STABLE: is it Ok?

[Lev Serebryakov]

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 I have mostly-storage server with 8GB of physical RAM and 9TB (5x2TB
HDD) raidz ZFS pool (so, about 6.5TB usable space).

 ARC is limited to 3GB by vfs.zfs.arc_max.

 This server runs Samba (of course), CrashPlan backup client (Linux
Java!), and torrent client (transmission-daemon).

 And I'm noticing this regularly ("screenshot" of top(1)):

Mem: 1712M Active, 3965M Inact, 2066M Wired, 137M Cache, 822M Buf,
4688K Free
ARC: 421M Total, 132M MFU, 54M MRU, 1040K Anon, 7900K Header, 227M Other
Swap: 4096M Total, 248M Used, 3848M Free, 6% Inuse

 As you can see, here are almost 4G of Inactive memory and only 412M
of ARC!

 Is it Ok? Why Inactive memory (non-dirty buffers?) are pressed ARC
out of memory?

- -- 
// Lev Serebryakov
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