Hi,
I did another test on both machine. And write performance on ZFS extraordinary
slow.
I did the following test on both machines
For write
time dd if=/dev/zero of=test.dbf bs=8k count=1048576
For read
time dd if=/testpool/test.dbf of=/dev/null bs=8k
ZFS machine has 32GB memory
UFS machine has 16GB memory
#### UFS machine test ###########
time dd if=/dev/zero of=test.dbf bs=8k count=1048576
1048576+0 records in
1048576+0 records out
real 2m18.352s
user 0m5.080s
sys 1m44.388s
#iostat -xnmpz 10
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.6 107.9 4.8 62668.4 0.0 6.7 0.1 61.9 1 83 c0t0d0
0.0 0.2 0.0 0.2 0.0 0.0 0.0 0.8 0 0 c0t0d0s5
0.6 107.7 4.8 62668.2 0.0 6.7 0.1 62.0 1 83 c0t0d0s7
--------------------------------------------
For read
# time dd if=test.dbf of=/dev/null bs=8k
1048576+0 records in
1048576+0 records out
real 1m21.285s
user 0m4.701s
sys 1m15.322s
For write it took 2.18 minutes and for read it took 1.21 minutes.
############## ZFS machine test ##################
# time dd if=/dev/zero of=test.dbf bs=8k count=1048576
1048576+0 records in
1048576+0 records out
real 140m33.590s
user 0m5.182s
sys 2m33.025s
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 8.2 0.0 1037.0 0.0 33.3 0.0 4062.3 0 100 c0t0d0
0.08.2 0.0 1037.0 0.0 33.3 0.0 4062.3 0 100 c0t0d0s0
-------------------------------------------------
For read
#time dd if=test.dbf of=/dev/null bs=8k
1048576+0 records in
1048576+0 records out
real 0m59.177s
user 0m4.471s
sys 0m54.723s
For write it took 140 minutes and for read 59 seconds(less then UFS)
-------------------------------------------------------------------------
In ZFS data was being write around 1037 kw/s while disk remain busy 100%.
In UFS data was being written around 62668 kw/s while disk is busy at 83%
Kindly help me how can I tune the writing performance on ZFS?
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