I'm
with Jeff... Looks like CP-Reads.
(Need to read from disk to be able to
calculate parity. Happens when unable
to write 'full stripes', e.g. full
aggregate)
Do statit and check your disk
statistics:
Hello
toasters
I
encounter rather strange situation
I
have a system FAS2040 with 1 aggr of
23x450g raid group ontap version
8.1.3p2
Every
write operation being generated on
this aggregate automatically caused
a read operation
When
I try to create 100% sequential
write operation using tools such as
sio_ntap or filersio
Instead
of the expected 150Mb throughput I
get 100MB write and 50MB read
On
another FAS2040 system using the
same commands I get 100% write and
no reads
As
you can see
filersio
asyncio_active 0 -r 0 64k 0 15g 60 1
/vol/test/testfile
CPU
NFS CIFS HTTP Total Net
kB/s Disk kB/s Tape kB/s
Cache Cache CP CP Disk
OTHER FCP iSCSI FCP kB/s
iSCSI kB/s
93%
0 0 0 5 26
1 24242 118671 0
0 0s 99% 72% Fn
43% 0 0 5
0 0 24 0
90%
0 0 0 4 4
1 40959 102501 0
0 19 100% 89% Fn
43% 1 0 3
0 0 2 0
86%
0 0 0 3
3 1 23126 125022 0
0 0s 99% 69% :
59% 0 0 3
0 0 2 0
93%
0 0 0 7 1
1 28200 135740 0
0 0s 99% 97% Ff
48% 7 0 0
0 0 0 0
92%
0 0 0 6 15
1 48764 115324 0
0 0s 99% 91% Ff
52% 0 0 6
0 0 14 0
90%
0 0 0 6 16
1 36148 156492 0
0 0s 99% 83% Ff
56% 0 0 6
0 0 14 0
95%
0 0 0 0 4
4 32784 114555 0
0 0s 99% 77% Fs
48% 0 0 0
0 0 0 0
92%
0 0 0 18 90
12 34931 104059 0
0 0s 99% 88% Fn
42% 0 0 18
0 0 79 0
88%
0 0 0 8 3
1 20463 124800 0
0 0s 100% 83% Fn
45% 5 0 3
0 0 2 0
89%
0 0 0 2 2
1 34050 112166 0
0 0s 99% 87% Fn
44% 0 0 2
0 0 1 0
92%
0 0 0 3 7
1 33025 112816 0
0 0s 99% 88% Fn
46% 0 0 3
0 0 5 0
91%
0 0 0 3 3
1 30929 130833 0
0 0s 100% 73% :
50% 0 0 3
0 0 2 0
92%
0 0 0 7 24
2 36484 134260 0
0 0s 100% 98% Ff
50% 0 0 7
0 0 22 0
86%
0 0 0 6 1
1 38608 125140 0
0 0s 99% 90% Ff
44% 5 0 1
0 0 1 0
93%
0 0 0 4 3
1 28748 104544 0
0 0s 100% 75% Ff
43% 0 0 4
0 0 2 0
87%
0 0 0 5 18
1 28128 158608 0
0 0s 100% 90% Fs
55% 0 0 5
0 0 17 0
93%
0 0 0 2 3
34 33115 104980 0
0 0s 99% 85% Fn
41% 0 0 2
0 0 1 32
84%
0 0 0 5 28
7 37185 109425 0
0 0s 100% 78% Fn
48% 0 0 5
0 0 21 0
91%
0 0 0 9 3
1 30224 118322 0
0 0s 99% 97% Fn
47% 7 0 2
0 0 1 0
89%
0 0 0 2 3
4 27649 118335 0
0 0s 99% 88% :
45% 0 0 2
0 0 1 0
CPU
NFS CIFS HTTP Total Net
kB/s Disk kB/s Tape kB/s
Cache Cache CP CP Disk
OTHER FCP iSCSI FCP kB/s
iSCSI kB/s
in out read write read
write age hit time ty
util
in out in out
88%
0 0 0 14 57
39 43284 133480
0 0 0s 100% 98% Ff
50% 0 0 14
0 0 52 0
92%
0 0 0 2 6
16 47936 109432
0 0 0s 99% 86% Ff
46% 0 0 2
0 0 1 0
88%
0 0 0 23 86
3 45340 141014
0 0 0s 99% 73% Ff
55% 3 0 20
0 0 82 0
92%
0 0 0 10 5
4 21787 123980
0 0 0s 99% 80% Fn
44% 7 0 3
0 0 1 0
95%
0 0 0 2 4
3 34751 98158
0 0 0s 99%
82% Fn 44% 0 0
2 0 0 1 0
91%
0 0 0 1 3
1 35022 118549 0
0 0s 100% 60% Fn
48% 0 0 1
0 0 0 0
92%
0 0 0 87 3
1 25455 123066
0 0 0s 100% 80% Fn
47% 84 0 3
0 0 1 0
83%
0 0 0 8 32
2 36956 121303
0 0 0s 100% 88% :
46% 0 0 8
0 0 30 0
85%
0 0 0 5 2
1 62064 140088 0
0 0s 100% 92% Ff
59% 5 0 0
0 0 0 0
95%
0 0 0 3 3
1 39352 117364 0
0 0s 99% 71% Ff
48% 0 0 3
0 0 2 0
94%
0 0 0 3 3
1 42008 136943 0
0 0s 99% 94% Fs
53% 0 0 3
0 0 2 0
92%
0 0 0 0 2
7 26147 111286 0
0 0s 99% 58% Fn
44% 0 0 0
0 0 0 0
90%
0 0 0 3 3
1 29567 110665 0
0 20 99% 87% Fn
44% 0 0 3
0 0 1 0
90%
0 0 0 9 4
1 40031 111273 0
0 16 99% 86% Fn
43% 5 0 4
0 0 2 0
84%
0 0 0 0 1
1 36760 105709 0
0 0s 100% 84% Fn
43% 0 0 0
0 0 0 0
92%
0 0 0 3 3
1 31033 137891 0
0 0s 100% 99% :
53% 0 0 3
0 0 2 0
83%
0 0 0 4 6
1 32991 140148 0
0 0s 100% 89% F
51% 0 0 4
0 0 5 0
Any
thoughts why this could happens ?
Nothing
else is running on this netapp
except for this test
Thanks
Alon
Z
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