磁盘读写测试

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[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/tmp/test1 bs=1M count=1000; done
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 6.32163 s, 166 MB/s
1000+0 records in
1000+0 records out
  G/ k+ ~; s0 g1048576000 bytes (1.0 GB) copied, 5.44758 s, 192 MB/s
  p7 J; I# O9 v$ ]0 ^) h1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 6.76302 s, 155 MB/s
1000+0 records in
' T8 c& P# X( @1000+0 records out
+ p% ?5 J# d$ @1 x% \1 W" U6 w1048576000 bytes (1.0 GB) copied, 9.26751 s, 113 MB/s
- y; T- D. a# N1000+0 records in
1000+0 records out
! c# u% }( e3 {- a4 ~1048576000 bytes (1.0 GB) copied, 8.68525 s, 121 MB/s
[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/nfstest/test1 bs=1M count=1000; done
dd: failed to open ‘/nfstest/test1’: No such file or directory
9 [5 f: T9 M" `, Z5 K6 l8 @dd: failed to open ‘/nfstest/test1’: No such file or directory
' l& D" ]2 p: r+ X4 |dd: failed to open ‘/nfstest/test1’: No such file or directory
* G3 T. l) O# m, Ydd: failed to open ‘/nfstest/test1’: No such file or directory
3 y/ f! h) X4 _/ hdd: failed to open ‘/nfstest/test1’: No such file or directory
- S' |. C7 j1 Z1 k; v  ]0 I[root@testssd ~]#  mkdir /nfstest
[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/nfstest/test1 bs=1M count=1000; done
1000+0 records in
+ ~* U4 b% s! H- \  o1000+0 records out
6 Y, v, }# T5 s0 x) Q9 V1048576000 bytes (1.0 GB) copied, 10.9929 s, 95.4 MB/s
9 E8 H* y; n; _, X' X( M( t/ J1000+0 records in
1000+0 records out
, N4 }1 ^; `& \' l! ?  ]1048576000 bytes (1.0 GB) copied, 9.55931 s, 110 MB/s
& G0 D, }" n/ H1000+0 records in
1000+0 records out
& N: i) C( U1 ?" B: }! a1048576000 bytes (1.0 GB) copied, 10.4851 s, 100 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 10.3672 s, 101 MB/s
1000+0 records in
% ?* k/ Z- {1 K# t" R4 ?1000+0 records out
1048576000 bytes (1.0 GB) copied, 10.7387 s, 97.6 MB/s
[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/tmp/test1 bs=1M count=1000 iflag=direct; done
  i$ k8 U$ s) O4 ?: ~3 a3 F5 Mdd: failed to open ‘/dev/zero’: Invalid argument
dd: failed to open ‘/dev/zero’: Invalid argument
dd: failed to open ‘/dev/zero’: Invalid argument
; n  y0 V6 B% C3 _4 @. Z8 o/ fdd: failed to open ‘/dev/zero’: Invalid argument
5 Z9 A" T3 \. n* Sdd: failed to open ‘/dev/zero’: Invalid argument
  `" a9 _1 n, ^3 \[root@testssd ~]# for i in {1..5}; do dd of=/dev/null if=/tmp/test1 bs=1M count=1000; done
! |! x8 e5 P" v; V" l( |1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 1.56524 s, 670 MB/s
1000+0 records in
( o2 }( F$ R4 C/ s3 z6 t1000+0 records out
8 R  Y1 {8 l+ Y8 G! P0 c1048576000 bytes (1.0 GB) copied, 0.17828 s, 5.9 GB/s
1000+0 records in
! h/ f6 M* }6 _( O& O0 N' H1000+0 records out
% k& I: O- r5 \0 P2 F) S, \$ U3 A1048576000 bytes (1.0 GB) copied, 0.196089 s, 5.3 GB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.590726 s, 1.8 GB/s
1000+0 records in
1000+0 records out
2 C% K2 f, g* t7 \0 d4 ^3 Y0 l1048576000 bytes (1.0 GB) copied, 0.219955 s, 4.8 GB/s
[root@testssd ~]#