1
May 14, 1997 by Robin Miller
3
The following changes have been made to 'dt' Version 10.8:
5
o Ali Eghlima added a "munsa={cr,pr,cw,pw,ex}" options which
6
uses DLM for MUNSA testing. Here's the 'dt' help text:
9
cr = Concurrent Read (permits read access, cr/pr/cw by others)
10
pr = Protected Read (permits cr/pr read access to all, no write)
11
cw = Concurrent Write (permits write and cr access to resource by all)
12
pw = Protected Write (permits write access, cr by others)
13
ex = Exclusive Mode (permits read/write access, no access to others)
15
For more details, please refer to the dlm(4) reference page.
17
o If a "skip=" count is specified with an output file "of=",
18
open the file for R/W access since skips are accompished via
19
read()'s of record size.
20
[ Per Olov Wahlstrom reported this problem. ]
22
o If a copy or verify operation is selected, and a data limit
23
is specified, then double the data limit to account for double
24
the I/O's. Previously, only half of the desired data limit was
25
copied and/or verified.
27
o Check status from closing file descriptor, and if it's not
28
SUCCESS, use this for the exit status. For tapes, deferred
29
writes and failure to write file marks occur at close time.
30
[ Roger Richardson reported this problem. ]
32
o If we encounter a ENOSPC error and no data has been transferred,
33
flag this as an error. This normally indicates a zero length
34
partition or the user may have seek'ed past eom or eop.
35
[ George Bittner reported this problem. ]
37
o Removed use of undocumented AIO_SEEK_CUR in aio_offset.
38
Also fixed bug where random I/O offset was clobbered, thus
39
resulting in sequential I/O.
40
[ Jeff Denham reported this problem. ]
42
o Report number of I/O's per second (some people desire this).
44
The latest version of 'dt' is available on our production machines
45
in the following account:
47
Location: wasted:~rmiller/dt.d/{dt-ptos,dt-dlm,dt-V3.2}
49
URL: http://www.zk3.dec.com/~rmiller/dt.html
53
================================================================================
54
This example shows the new handling of ENOSPC error code:
56
% dt of=/dev/rrz2b position=393216b records=1 disable=verify
57
dt: 'write' - No space left on device
58
dt: Error number 1 occurred on Wed May 14 14:27:45 1997
60
Output device/file name: /dev/rrz2b (Device: RZ25, type=disk)
61
Data pattern written: 0x39c39c39 (read verify disabled)
62
Total records processed: 0 @ 512 bytes/record (0.500 Kbytes)
63
Total bytes transferred: 0 (0.000 Kbytes, 0.000 Mbytes)
64
Average transfer rates: 0 bytes/sec, 0.000 Kbytes/sec
65
Number I/O's per second: 0.000
66
Total passes completed: 1/1
67
Total errors detected: 1/1
68
Total elapsed time: 00m00.03s
69
Total system time: 00m00.01s
70
Total user time: 00m00.00s
71
Starting time: Wed May 14 14:27:45 1997
72
Ending time: Wed May 14 14:27:45 1997
78
================================================================================
79
This example shows the "Number I/O's per second" addition:
81
im2fast% dt of=/var/tmp/dt.data bs=8k limit=25m
83
Total records processed: 3200 @ 8192 bytes/record (8.000 Kbytes)
84
Total bytes transferred: 26214400 (25600.000 Kbytes, 25.000 Mbytes)
85
Average transfer rates: 2021676 bytes/sec, 1974.293 Kbytes/sec
86
Number I/O's per second: 246.787
87
Total passes completed: 0/1
88
Total errors detected: 0/1
89
Total elapsed time: 00m12.96s
90
Total system time: 00m00.95s
91
Total user time: 00m01.70s
94
Total records processed: 3200 @ 8192 bytes/record (8.000 Kbytes)
95
Total bytes transferred: 26214400 (25600.000 Kbytes, 25.000 Mbytes)
96
Average transfer rates: 4239526 bytes/sec, 4140.162 Kbytes/sec
97
Number I/O's per second: 517.520
98
Total passes completed: 1/1
99
Total errors detected: 0/1
100
Total elapsed time: 00m06.18s
101
Total system time: 00m00.61s
102
Total user time: 00m05.50s
105
Output device/file name: /var/tmp/dt.data
106
Data pattern read/written: 0x39c39c39
107
Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes)
108
Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes)
109
Average transfer rates: 2737796 bytes/sec, 2673.629 Kbytes/sec
110
Number I/O's per second: 334.204
111
Total passes completed: 1/1
112
Total errors detected: 0/1
113
Total elapsed time: 00m19.15s
114
Total system time: 00m01.56s
115
Total user time: 00m07.20s
116
Starting time: Wed May 14 15:45:18 1997
117
Ending time: Wed May 14 15:45:37 1997
121
==============================================================================
added
removed
WhatsNew-May14,1997
