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<HTML><HEAD><TITLE>Data Test Program (dt) August 2nd, 1999</TITLE></HEAD><BODY BGCOLOR="#D19275"><CENTER><H2><STRONG>What's New as of August 2nd, 1999</STRONG></H2></CENTER><H2>Changes For This Release</H2>The following changes have been made to <I>dt</I> Version 12.3:<UL><LI>Updated <I>dt</I> User's Manual. Postscript file in <I>dt</I> kit.<LI>Ported <I>dt</I> to Linux and FreeBSD operating systems.<LI>On 32-bit systems, either "long long" or "double" is used forlarger data and record limits, as well as total statistics.This is necessary for large capacity disks and tapes.<LI>Added "<I>pattern=iot</I>" option which encodes the logical block addressin the first 4 bytes, then uses (lba += 0x01010101) to seed theremaining data bytes in each 512 byte block.<LI><I>dt</I> now accepts 't' or 'T' for terabyte on numeric values.<LI>The option "enable=microdelay" enables micro-second values forvarious delays, instead of the default of seconds.</UL><P><CENTER>Within Compaq, the updated <I>dt</I> kits are located @ URL:</CENTER><P><CENTER><A HREF="http://www.zk3.dec.com/~rmiller/dt.html">http://www.zk3.dec.com/~rmiller/dt.html</A></CENTER><P><CENTER>External to Compaq, you can obtain <I>dt</I> kits from URL:</CENTER><P><CENTER><A HREF="http://www.bit-net.com/~rmiller/dt.html">http://www.bit-net.com/~rmiller/dt.html</A></CENTER></UL><HR><A HREF="mailto:Robin.Miller@compaq.com"><IMG SRC="../gifs/mailbox.gif" ALT="Mail"></A>Send mail to admin of this page: <EM>Robin.Miller@compaq.com</EM> <A HREF="../index.html"><IMG SRC="../gifs/home04.gif" ALT="Home"></A>To Robin's home page.<P>Last modified: December 8th, 1999<HR><H2>Examples:</H2><HR SIZE=5 NOSHADE><PRE> Here's an example of 'dt' reading and comparing the first 100 megabytes of the IOT test disc. Slow I/O due to RRD42! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -linux% <B>dt if=/dev/scd0 bs=32k pattern=iot limit=100m</B>Total Statistics: Input device/file name: /dev/scd0 (device type=disk) Data pattern string used: 'IOT Pattern' Total records processed: 3200 @ 32768 bytes/record (32.000 Kbytes) Total bytes transferred: 104857600 (102400.000 Kbytes, 100.000 Mbytes) Average transfer rates: 153137 bytes/sec, 149.548 Kbytes/sec Number I/O's per second: 4.673 Total passes completed: 1/1 Total errors detected: 0/1 Total elapsed time: 11m24.73s Total system time: 00m00.82s Total user time: 00m07.68s Starting time: Thu Jul 22 14:52:45 1999 Ending time: Thu Jul 22 15:04:10 1999linux%<HR> The IOT data pattern can be used with any device/file. Here's an example of what the IOT data pattern looks like. The logical block address (lba) is placed in the first 4 bytes, then each remaining u_int gets (lba += 0x01010101). - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -linux% <B>dt of=- count=1 pattern=iot lba=0x64 disable=stats | od -Ax -tx1</B>000000 64 00 00 00 65 01 01 01 66 02 02 02 67 03 03 03000010 68 04 04 04 69 05 05 05 6a 06 06 06 6b 07 07 07000020 6c 08 08 08 6d 09 09 09 6e 0a 0a 0a 6f 0b 0b 0b000030 70 0c 0c 0c 71 0d 0d 0d 72 0e 0e 0e 73 0f 0f 0f000040 74 10 10 10 75 11 11 11 76 12 12 12 77 13 13 13000050 78 14 14 14 79 15 15 15 7a 16 16 16 7b 17 17 17000060 7c 18 18 18 7d 19 19 19 7e 1a 1a 1a 7f 1b 1b 1b000070 80 1c 1c 1c 81 1d 1d 1d 82 1e 1e 1e 83 1f 1f 1f000080 84 20 20 20 85 21 21 21 86 22 22 22 87 23 23 23000090 88 24 24 24 89 25 25 25 8a 26 26 26 8b 27 27 270000a0 8c 28 28 28 8d 29 29 29 8e 2a 2a 2a 8f 2b 2b 2b0000b0 90 2c 2c 2c 91 2d 2d 2d 92 2e 2e 2e 93 2f 2f 2f0000c0 94 30 30 30 95 31 31 31 96 32 32 32 97 33 33 330000d0 98 34 34 34 99 35 35 35 9a 36 36 36 9b 37 37 370000e0 9c 38 38 38 9d 39 39 39 9e 3a 3a 3a 9f 3b 3b 3b0000f0 a0 3c 3c 3c a1 3d 3d 3d a2 3e 3e 3e a3 3f 3f 3f000100 a4 40 40 40 a5 41 41 41 a6 42 42 42 a7 43 43 43000110 a8 44 44 44 a9 45 45 45 aa 46 46 46 ab 47 47 47000120 ac 48 48 48 ad 49 49 49 ae 4a 4a 4a af 4b 4b 4b000130 b0 4c 4c 4c b1 4d 4d 4d b2 4e 4e 4e b3 4f 4f 4f000140 b4 50 50 50 b5 51 51 51 b6 52 52 52 b7 53 53 53000150 b8 54 54 54 b9 55 55 55 ba 56 56 56 bb 57 57 57000160 bc 58 58 58 bd 59 59 59 be 5a 5a 5a bf 5b 5b 5b000170 c0 5c 5c 5c c1 5d 5d 5d c2 5e 5e 5e c3 5f 5f 5f000180 c4 60 60 60 c5 61 61 61 c6 62 62 62 c7 63 63 63000190 c8 64 64 64 c9 65 65 65 ca 66 66 66 cb 67 67 670001a0 cc 68 68 68 cd 69 69 69 ce 6a 6a 6a cf 6b 6b 6b0001b0 d0 6c 6c 6c d1 6d 6d 6d d2 6e 6e 6e d3 6f 6f 6f0001c0 d4 70 70 70 d5 71 71 71 d6 72 72 72 d7 73 73 730001d0 d8 74 74 74 d9 75 75 75 da 76 76 76 db 77 77 770001e0 dc 78 78 78 dd 79 79 79 de 7a 7a 7a df 7b 7b 7b0001f0 e0 7c 7c 7c e1 7d 7d 7d e2 7e 7e 7e e3 7f 7f 7f000200linux%</PRE></BODY></HTML>?? 快捷鍵說明
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