whatsnew-jan12,2000

Linux磁盘测试的源代码,测试磁盘的读写性能

January 12th, 2000 Robin Miller		    Last Updated: February 19th, 2000

	The following changes were made to 'dt' Version 13.6:

     o	For Tru64 cluster systems, make the EEI reset handling more
	bullet proof.  The new logic retries open() attempts, does not
	fail close() when processing resets, and retries operations
	failed with EEI_NO_STATUS while processing reset conditions.

     o	For Tru64 Unix (zulu), added "flags=direct" to enable direct
	I/O (disables file system caching).

     o	Added multi-volume media support via "enable=multi" option.
	A single large file can be written to span multiple tapes, or
	you can specify "files=value" to write multiple tape files
	that span multiple tapes.  This support is general enough to
	be used with any removable media.

     o	Added read-after-write support via "enable=raw".  This can also
	be used with tapes (backspace/read done after each record written).
	Note:  This may become the default for random access devices.

     o	Fixed problem with random I/O data limits being exceeded.  The
	upper and lower random I/O limits are now enforced, and a sanity
	check is done at startup to ensure your data limits are alright.

     o	The "lba=" option now seeks to specified block address.  This
	lba is relative to the start of the partition used (of course).
	This still enables the lbdata option, which means the lba gets
	stored in the first 4 bytes of each data block.  You can use
	"disable=lbdata" after if you don't want this lba encoding.
	Note: "position=" option takes precedence over "lba=" option.

     o	The IOT and Lbdata options now work with seek or skip options
	when testing disk devices (lba is determined from the file offset).

     o	Writes of zero length now get flagged as a error, instead of EOF.

     o	New "enable=rdebug" option to enable random I/O debug only.

     o	New "rseed=value" option to specify the random I/O seed.  This
	allows you to repeat random I/O sequences.  When random I/O is
	enabled, the total statistics displays the seed used.

     o	IOT pattern now works properly with AIO to multiple tape files.

     o	IOT logical block number now reported on data compare errors.

     o	When testing multiple tape files with the IOT or Lbdata options,
	the block number is now continued from the previous tape file.
	This provides better verification in case file position is lost.

     o	Specifying ralign, rlimit, or rseed options now automatically
	enables random I/O, thus iotype=random is not necessary too.

     o	Added checks at EOF with/multi-volume enabled, so Copy/Verify
	operations properly prompt for the next volume.  This allows 'dt'
	to be used as a general purpose multi-volume tool w/other utilities.

	Within Compaq, the updated 'dt' kits are located @ URL:

		http://www.zk3.dec.com/~rmiller/dt.html

	External to Compaq, you can obtain 'dt' kits from URL:

		http://www.bit-net.com/~rmiller/dt.html

Cheers,
Robin
================================================================================
Example showing read-after-write option:
----------------------------------------

tru64% dt of=/dev/rfd0c min=b max=64k incr=7b iotype=random enable=raw runtime=3m
Read After Write Statistics:
     Total records processed: 100 with min=512, max=65536, incr=3584
     Total bytes transferred: 2949120 (2880.000 Kbytes, 2.812 Mbytes)
      Average transfer rates: 16923 bytes/sec, 16.526 Kbytes/sec
     Number I/O's per second: 0.574
      Total passes completed: 1
       Total errors detected: 0/1
          Total elapsed time: 02m54.26s
           Total system time: 00m00.01s
             Total user time: 00m00.16s

Total Statistics:
     Output device/file name: /dev/rfd0c (Device: floppy, type=disk)
     Type of I/O's performed: random (seed 0xa775f81)
   Data pattern read/written: 0x00ff00ff
     Total records processed: 109 with min=512, max=65536, incr=3584
     Total bytes transferred: 3011072 (2940.500 Kbytes, 2.872 Mbytes)
      Average transfer rates: 16642 bytes/sec, 16.252 Kbytes/sec
     Number I/O's per second: 0.602
      Total passes completed: 1
       Total errors detected: 0/1
          Total elapsed time: 03m00.93s
           Total system time: 00m00.01s
             Total user time: 00m00.16s
               Starting time: Wed Jan 12 16:38:38 2000
                 Ending time: Wed Jan 12 16:41:43 2000

tru64% 

================================================================================
Example showing multi-volume option:
------------------------------------

linux% dt of=/dev/st0 bs=32k files=4 limit=50m pattern=iot enable=multi
Please insert volume #2 in drive /dev/st0... Press ENTER when ready to proceed: 
        [ Continuing in file #3, record #1425, bytes written so far 151519232... ]
Write Statistics:
     Total records processed: 6400 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 209715200 (204800.000 Kbytes, 200.000 Mbytes)
      Average transfer rates: 510529 bytes/sec, 498.564 Kbytes/sec
     Number I/O's per second: 15.580
      Total passes completed: 0/1
       Total files processed: 4/4
       Total errors detected: 0/1
          Total elapsed time: 06m50.78s
           Total system time: 00m00.75s
             Total user time: 00m06.90s

Please insert volume #1 in drive /dev/st0... Press ENTER when ready to proceed: 
Please insert volume #2 in drive /dev/st0... Press ENTER when ready to proceed: 
        [ Continuing in file #3, record #1425, bytes read so far 151519232... ]
Read Statistics:
     Total records processed: 6400 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 209715200 (204800.000 Kbytes, 200.000 Mbytes)
      Average transfer rates: 489657 bytes/sec, 478.181 Kbytes/sec
     Number I/O's per second: 14.943
      Total passes completed: 1/1
       Total files processed: 4/4
       Total errors detected: 0/1
          Total elapsed time: 07m08.29s
           Total system time: 00m00.91s
             Total user time: 00m26.53s

Total Statistics:
     Output device/file name: /dev/st0 (device type=tape)
     Type of I/O's performed: sequential
    Data pattern string used: 'IOT Pattern'
     Total records processed: 12800 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 419430400 (409600.000 Kbytes, 400.000 Mbytes)
      Average transfer rates: 434589 bytes/sec, 424.403 Kbytes/sec
     Number I/O's per second: 13.263
      Total passes completed: 1/1
       Total files processed: 8/8
       Total errors detected: 0/1
          Total elapsed time: 16m05.12s
           Total system time: 00m01.66s
             Total user time: 00m33.43s
               Starting time: Fri Feb 18 18:48:22 2000
                 Ending time: Fri Feb 18 19:04:28 2000

linux% 

================================================================================
Example showing proper operation of IOT pattern with lba option:
----------------------------------------------------------------

tru64% dt if=/dev/rrz4c min=1b max=64k incr=7k lba=1000 limit=100m pattern=iot
Total Statistics:
      Input device/file name: /dev/rrz4c (Device: RRD47, type=disk)
     Type of I/O's performed: sequential
    Data pattern string used: 'IOT Pattern'
     Total records processed: 3200 with min=512, max=65536, incr=7168
     Total bytes transferred: 104857600 (102400.000 Kbytes, 100.000 Mbytes)
      Average transfer rates: 878695 bytes/sec, 858.101 Kbytes/sec
     Number I/O's per second: 26.816
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 01m59.33s
           Total system time: 00m00.35s
             Total user time: 00m14.05s
               Starting time: Thu Jan 13 14:46:32 2000
                 Ending time: Thu Jan 13 14:48:33 2000

tru64% 

================================================================================
Example showing proper operation with mutliple tape files:
----------------------------------------------------------

linux% dt of=/dev/st0 bs=64k limit=10m enable=lbdata files=10
Write Statistics:
     Total records processed: 1600 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 104857600 (102400.000 Kbytes, 100.000 Mbytes)
      Average transfer rates: 1559917 bytes/sec, 1523.356 Kbytes/sec
     Number I/O's per second: 23.802
      Total passes completed: 0/1
       Total files processed: 10/10
       Total errors detected: 0/1
          Total elapsed time: 01m07.22s
           Total system time: 00m00.45s
             Total user time: 00m02.90s

Read Statistics:
     Total records processed: 1600 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 104857600 (102400.000 Kbytes, 100.000 Mbytes)
      Average transfer rates: 2359532 bytes/sec, 2304.230 Kbytes/sec
     Number I/O's per second: 36.004
      Total passes completed: 1/1
       Total files processed: 10/10
       Total errors detected: 0/1
          Total elapsed time: 00m44.44s
           Total system time: 00m00.56s
             Total user time: 00m13.07s

Total Statistics:
     Output device/file name: /dev/st0 (device type=tape)
     Type of I/O's performed: sequential
   Data pattern read/written: 0x39c39c39 (w/lbdata, starting lba 0)
     Total records processed: 3200 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 209715200 (204800.000 Kbytes, 200.000 Mbytes)
      Average transfer rates: 1661374 bytes/sec, 1622.435 Kbytes/sec
     Number I/O's per second: 25.351
      Total passes completed: 1/1
       Total files processed: 20/20
       Total errors detected: 0/1
          Total elapsed time: 02m06.23s
           Total system time: 00m01.01s
             Total user time: 00m15.98s
               Starting time: Thu Jan 13 14:50:51 2000
                 Ending time: Thu Jan 13 14:52:57 2000

linux% 

================================================================================
Example showing multi-volume capability with 'tar':
---------------------------------------------------

tru64% tar cf - dt.d | dt if=- of=/dev/rfd0c bs=10k iomode=copy enable=multi
Please insert volume #2 in drive /dev/rfd0c... Press ENTER when ready to proceed: 
        [ Continuing at record #145, bytes written so far 1474560... ]
Total Statistics:
      Input device/file name: - (device type=pipe)
     Type of I/O's performed: sequential
     Total records processed: 392 @ 10240 bytes/record (10.000 Kbytes)
     Total bytes transferred: 4014080 (3920.000 Kbytes, 3.828 Mbytes)
      Average transfer rates: 39961 bytes/sec, 39.024 Kbytes/sec
     Number I/O's per second: 3.902
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 01m40.45s
           Total system time: 00m00.06s
             Total user time: 00m00.00s
               Starting time: Wed Jan 19 17:10:43 2000
                 Ending time: Wed Jan 19 17:12:24 2000

tru64% 
tru64% tar cf - dt.d | dt if=- of=/dev/rfd0c bs=10k iomode=verify enable=multi
Please insert volume #2 in drive /dev/rfd0c... Press ENTER when ready to proceed: 
        [ Continuing at record #145, bytes read so far 1474560... ]
Total Statistics:
      Input device/file name: - (device type=pipe)
     Type of I/O's performed: sequential
    Data operation performed: Verified '-' with '/dev/rfd0c'.
     Total records processed: 392 @ 10240 bytes/record (10.000 Kbytes)
     Total bytes transferred: 4014080 (3920.000 Kbytes, 3.828 Mbytes)
      Average transfer rates: 38486 bytes/sec, 37.584 Kbytes/sec
     Number I/O's per second: 3.758
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 01m44.30s
           Total system time: 00m00.05s
             Total user time: 00m00.15s
               Starting time: Wed Jan 19 17:14:16 2000
                 Ending time: Wed Jan 19 17:16:03 2000

tru64% 
tru64% mv dt.d dtx.d
tru64% dt if=/dev/rfd0c of=- bs=10k iomode=copy enable=multi | tar xvf -
blocksize = 20
x dt.d
x dt.d/dt.c, 79238 bytes, 155 tape blocks
		.
		.
		.
x dt.d/tape0c.log, 6447 bytes, 13 tape blocks
Please insert volume #2 in drive /dev/rfd0c... Press ENTER when ready to proceed: 
        [ Continuing at record #145, bytes read so far 1474560... ]
x dt.d/rmt0h.log, 28482 bytes, 56 tape blocks
		.
		.
		.
Total Statistics:
      Input device/file name: /dev/rfd0c (Device: floppy, type=disk)
     Type of I/O's performed: sequential
    Data operation performed: Copied '/dev/rfd0c' to '-'.
     Total records processed: 393 @ 10240 bytes/record (10.000 Kbytes)
     Total bytes transferred: 2017280 (1970.000 Kbytes, 1.924 Mbytes)
      Average transfer rates: 20793 bytes/sec, 20.306 Kbytes/sec
     Number I/O's per second: 4.051
      Total passes completed: 0/1
       Total errors detected: 0/1
          Total elapsed time: 01m37.01s
           Total system time: 00m00.06s
             Total user time: 00m00.00s
               Starting time: Wed Jan 19 17:18:10 2000
                 Ending time: Wed Jan 19 17:19:50 2000

tru64% diff -r dt.d dtx.d
tru64%