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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f1tattoo

f1tattoo(1)							   f1tattoo 0.7 						       f1tattoo(1)

NAME

       f1tattoo - disc T@2 feature for Yamaha F1 CD-RW devices

SYNOPSIS

       f1tattoo [-l] [-h]
       f1tattoo -d DEVICE [-c] [-s] [--tattoo-test]
       f1tattoo -d DEVICE --tattoo-raw <file.raw>
       f1tattoo -d DEVICE --tattoo-png <file.png>

DESCRIPTION

       f1tattoo is the linux console tool to use the Yamaha disc T@2 feature. You won't get satisfying results on Phtalocyanin dye.

FEATURES

       You can disc T@2 with these drives:
       Yamaha F1 CD-RW, Yamaha F1DX

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, --scanbus
		 scan busses for all available CD and DVD devices.

       -h, --help
		 help. show available options.

       -c, --current
		 show current drive settings of selected device

       -s, --supported
		 show supported features of selected device

       --tattoo-test
		 write DiscT@2 test image

       --tattoo-raw tattoo.raw
		 write DiscT@2 using raw data from tattoo.raw file

       --tattoo-png tattoo.png
		 write DiscT@2 using png image from tattoo.png file	      check if f1tattoo compiled with png support using --help option

       -v, --verbose
		 give verbose output

EXAMPLES

       f1tattoo -l
		 list all available CD- and DVD-devices

       f1tattoo -d /dev/hdc --tattoo-raw filename.raw
		 writes DiscT@2 using filename.raw file on media in device /dev/hdc

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

Gennady ShultZ Kozlov						  10. April, 2009						       f1tattoo(1)