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
% a$ a5 Z9 M: U1000+0 records out
1048576000 bytes (1.0 GB) copied, 6.32163 s, 166 MB/s
  ^9 C# w! B  F- z% F& o5 C1000+0 records in
! }: U; A0 c# S" \7 H- o1000+0 records out
- c! A" H" F8 G) _9 b) H" i0 @1048576000 bytes (1.0 GB) copied, 5.44758 s, 192 MB/s
1000+0 records in
0 u' N( i: U! o+ D) V1000+0 records out
& q' n. Z7 Q. }0 W; n7 |1048576000 bytes (1.0 GB) copied, 6.76302 s, 155 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 9.26751 s, 113 MB/s
1000+0 records in
& D( J$ H1 X! o! ^+ Q' W1000+0 records out
7 M1 n, r* E9 g) Z6 a5 O2 X1048576000 bytes (1.0 GB) copied, 8.68525 s, 121 MB/s
$ D* A, {$ T& _! d& `" [  [[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/nfstest/test1 bs=1M count=1000; done
* E0 ^( W/ B7 |dd: failed to open ‘/nfstest/test1’: No such file or directory
" E$ s# Y$ O) Y. Z2 add: failed to open ‘/nfstest/test1’: No such file or directory
dd: failed to open ‘/nfstest/test1’: No such file or directory
% Z( h" d" v7 `5 B) odd: failed to open ‘/nfstest/test1’: No such file or directory
dd: failed to open ‘/nfstest/test1’: No such file or directory
. Z3 `6 ]& i, Y3 {; D3 y/ ]* R[root@testssd ~]#  mkdir /nfstest
[root@testssd ~]# for i in {1..5}; do dd if=/dev/zero of=/nfstest/test1 bs=1M count=1000; done
* d( P) a9 Y+ F: c% o: B1000+0 records in
5 p1 L2 W( S! T8 j' b5 Q1000+0 records out
! b' Z5 r" f) T' C1 q7 m1048576000 bytes (1.0 GB) copied, 10.9929 s, 95.4 MB/s
1000+0 records in
% V/ @/ W4 E; Y0 w' d: T& W9 Z1000+0 records out
1048576000 bytes (1.0 GB) copied, 9.55931 s, 110 MB/s
6 D1 e0 u6 I+ w  H' s1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 10.4851 s, 100 MB/s
1000+0 records in
1000+0 records out
' l( U# j( z; H& q: p3 p1048576000 bytes (1.0 GB) copied, 10.3672 s, 101 MB/s
1000+0 records in
) u, I3 v2 V- v. _1 P1000+0 records out
/ R9 c# Z- x. m: j/ e* Q$ a. o1048576000 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
dd: failed to open ‘/dev/zero’: Invalid argument
dd: failed to open ‘/dev/zero’: Invalid argument
4 ]& b$ a) x$ m+ W' F( {/ bdd: failed to open ‘/dev/zero’: Invalid argument
dd: failed to open ‘/dev/zero’: Invalid argument
dd: failed to open ‘/dev/zero’: Invalid argument
[root@testssd ~]# for i in {1..5}; do dd of=/dev/null if=/tmp/test1 bs=1M count=1000; done
1000+0 records in
* ]1 d1 c0 G2 W6 z1000+0 records out
4 D+ r! k' f8 J1048576000 bytes (1.0 GB) copied, 1.56524 s, 670 MB/s
1000+0 records in
3 g6 \/ j- ^/ ^: L' _1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.17828 s, 5.9 GB/s
1000+0 records in
7 u. c4 ~6 f$ E; E/ g7 Z: Z0 F+ I9 [1000+0 records out
7 I( L; m3 g1 @# W& }1048576000 bytes (1.0 GB) copied, 0.196089 s, 5.3 GB/s
$ F! O4 D# L' o( Z1000+0 records in
. u9 W& N6 X5 F0 h1 p9 h& @8 N9 ]1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.590726 s, 1.8 GB/s
+ W4 E; L7 s" ]7 z: ?1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.219955 s, 4.8 GB/s
[root@testssd ~]#