We are running 8-STABLE (csupped at 20110504) on a NFS fileserver.
It has 32 GB RAM and uses ZFS:
home ONLINE 0 0 0
raidz2 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
da5 ONLINE 0 0 0
raidz2 ONLINE 0 0 0
da6 ONLINE 0 0 0
da7 ONLINE 0 0 0
da8 ONLINE 0 0 0
da9 ONLINE 0 0 0
da10 ONLINE 0 0 0
logs
mirror ONLINE 0 0 0
da12 ONLINE 0 0 0
da13 ONLINE 0 0 0
cache
ad4 ONLINE 0 0 0
ad8 ONLINE 0 0 0
Before upgrading from 8.0, the machine never used the whole system
memory, it left about 10 GB free even after about 100 days uptime.
Now, it eats RAM insanely (wired is between 29 GB and 30 GB), which is
quite good I think, but after about 3 days uptime, we now have 106 MB
swapped out. Both L2ARC SSDs are ~74 GB in size, arc_summary prints the
following values:
ARC Size:
Current Size: 76.21% 23440.22M (arcsize)
Target Size: (Adaptive) 76.52% 23535.40M (c)
Min Size (Hard Limit): 12.50% 3844.77M (c_min)
Max Size (High Water): ~8:1 30758.16M (c_max)
L2 ARC Size:
Current Size: (Adaptive) 88466.19M
Header Size: 0.29% 259.21M
The following sysctls were set:
security.bsd.see_other_uids=0
kern.maxvnodes=400000
kern.ipc.somaxconn=8192
kern.ipc.maxsockbuf=1024000
net.inet.udp.maxdgram=57344
vfs.ufs.dirhash_maxmem=25165824
My question now: why does the machine swap, is this normal behaviour?
Why is wired at about 30 GB if ARC=23 GB and L2ARC-header=259 MB?
with kind regards,
Robert Schulze
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