Determining Disk Speed Post: 302710745

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Top Forums UNIX for Dummies Questions & Answers Determining Disk Speed Post 302710745 by mojoman on Thursday 4th of October 2012 08:13:42 PM

10-04-2012

Registered User

Determining Disk Speed

Hi,

I went to a computer store and the salesman sold me a SATA cable and told me that all SATA cables are the same. Another salesman at a different store told me a cable rated for SATA 2, which I bought, MIGHT work as well as one rate for SATA 3 but it is not guaranteed. I decided to run a speed test on my SSD drive to check the results.

Code:

dd if=/dev/zero of=/tmp/output.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 0.530362 s, 4.0 GB/s

Code:

for i in 1 2 3; do hdparm -tT /dev/sda; done

/dev/sda:
 Timing cached reads:   27076 MB in  2.00 seconds = 13556.06 MB/sec
 Timing buffered disk reads: 1244 MB in  3.00 seconds = 414.46 MB/sec

/dev/sda:
 Timing cached reads:   28788 MB in  2.00 seconds = 14414.45 MB/sec
 Timing buffered disk reads: 1244 MB in  3.00 seconds = 414.48 MB/sec

/dev/sda:
 Timing cached reads:   27958 MB in  2.00 seconds = 13998.11 MB/sec
 Timing buffered disk reads: 1248 MB in  3.00 seconds = 415.91 MB/sec
[root@mohit-speed-daemon ~]#

I can verify from dmesg and /var/log/messages analysis that I am connected a 6.0gbps. Are my results consistent with that type of connection?

mojoman

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pxfw

pxfw(8) 							     pxfw 0.5								   pxfw(8)

NAME

       pxfw - Firmware flashing tool for Plextor CD/DVD devices

SYNOPSIS

       pxfw -l
       pxfw -d DEVICE [-if firmware.bin] [-u] [-f] [-v]
       pxfw -d DEVICE [-e] [-r] [-t] [-v]

DESCRIPTION

       pxfw is the linux firmware flasher for Plextor CD and DVD drives.  Remove any disks before flashing.

FEATURES

       You can flash the firmware of these drives:
       Plextor Premium, Premium-2, PX-712, PX-716, PX-755 and PX-760.

DEVICE

       can be an IDE, SCSI, SATA, USB or FireWire connected optical drive. Not all SATA controller support all Plextor features.

       Linux:
       /dev/hdX: IDE device
       /dev/scdX: Linux 2.4: SATA, SCSI, USB device, or IDE device via ide-scsi emulation
       /dev/srX: Linux 2.6: IDE device via new ATA layer, SCSI or USB device

       OpenBSD/NetBSD:
       /dev/rcdX

       FreeBSD:
       /dev/cd: SCSI device
       /dev/acd: ATA device

       MacOS X:
       /dev/disk:

       win32:
       C:,D:,E:, ... X:,Y:,Z:

OPTIONS

       -l   scan busses for all available CD and DVD devices

       -if  select inputfile. Specify the firmware binary file, which should
	    be written to DEVICE.

       -u   proceed update. When the firmware checksum test has succeeded,
	    write firmware to DEVICE.

       -f   force flashing. Even if DEVICE is not recognized, or firmware.
	    checksum has failed, firmware writing will be forced.
	    Handle with care.

       -e   read EEPROM from DEVICE.

       -r   reboot the device.

       -t   test which opcodes are supported by the device.

       -v   debug.

EXAMPLES

       pxfw -d /dev/hdc -if 755_1.07.bin -u
       writes firmware file 755_1.07.bin into Master Drive on Secondary IDE-Port.

       pxfw -d /dev/sr3 -e -oe file.foo
       reades EEPROM from device /dev/sr3 and writes it to file.foo.

       please report man page improvements to T.Maguin@web.de

Gennady ShultZ Kozlov						  02 April, 2009							   pxfw(8)