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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LEARN ABOUT FREEBSD

hptiop

HPTIOP(4)						   BSD Kernel Interfaces Manual 						 HPTIOP(4)

NAME

     hptiop -- HighPoint RocketRAID 3xxx/4xxx device driver

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   device hptiop
	   device scbus
	   device da

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   hptiop_load="YES"

DESCRIPTION

     The hptiop driver provides support for the HighPoint RocketRAID 3xxx/4xxx series of SAS and SATA RAID controllers.

HARDWARE

     The hptiop driver supports the following SAS and SATA RAID controllers:

     o	 HighPoint RocketRAID 4522
     o	 HighPoint RocketRAID 4521
     o	 HighPoint RocketRAID 4520
     o	 HighPoint RocketRAID 4322
     o	 HighPoint RocketRAID 4321
     o	 HighPoint RocketRAID 4320
     o	 HighPoint RocketRAID 4311
     o	 HighPoint RocketRAID 4310
     o	 HighPoint RocketRAID 3640
     o	 HighPoint RocketRAID 3622
     o	 HighPoint RocketRAID 3620

     The hptiop driver also supports the following SAS and SATA RAID controllers that are already End-of-Life:

     o	 HighPoint RocketRAID 4211
     o	 HighPoint RocketRAID 4210
     o	 HighPoint RocketRAID 3560
     o	 HighPoint RocketRAID 3540
     o	 HighPoint RocketRAID 3530
     o	 HighPoint RocketRAID 3522
     o	 HighPoint RocketRAID 3521
     o	 HighPoint RocketRAID 3520
     o	 HighPoint RocketRAID 3511
     o	 HighPoint RocketRAID 3510
     o	 HighPoint RocketRAID 3410
     o	 HighPoint RocketRAID 3320
     o	 HighPoint RocketRAID 3220
     o	 HighPoint RocketRAID 3122
     o	 HighPoint RocketRAID 3120
     o	 HighPoint RocketRAID 3020

NOTES

     The hptiop driver has only been tested on the i386 and amd64 platforms.

SEE ALSO

     cam(4), hptmv(4)

HISTORY

     The hptiop device driver first appeared in FreeBSD 7.0.

AUTHORS

     The hptiop driver was written by HighPoint Technologies, Inc.

BSD
								   July 5, 2013 							       BSD