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Full Discussion: Determining Disk Speed
Top Forums UNIX for Dummies Questions & Answers Determining Disk Speed Post 302710745 by mojoman on Thursday 4th of October 2012 08:13:42 PM
Old 10-04-2012
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?
 

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MVSATA(4)						   BSD Kernel Interfaces Manual 						 MVSATA(4)

NAME
mvsata -- Marvell Hercules-I and Hercules-II SATA controllers driver SYNOPSIS
mvsata* at pci? dev ? function ? DESCRIPTION
The mvsata driver supports the Marvell Hercules-I and Hercules-II family of SATA controllers, interfacing the hardware with the ata(4) and atapi(4) subsystems. The following controllers are supported by the mvsata driver: Adaptec RAID 1420SA Adaptec RAID 1430SA Marvell 88SX50xx Hercules-I Marvell 88SX60xx Hercules-II Marvell 88SX70xx Hercules-II Triones Technologies RocketRAID 2310 RAID card The 88SX60xx and later support Native Command Queuing. The 88SX70xx also supports ATAPI. SEE ALSO
ata(4), atapi(4), pci(4), wd(4) HISTORY
The mvsata driver first appeared in NetBSD 6.0. AUTHORS
The mvsata driver was written by KIYOHARA Takashi <kiyohara@kk.iij4u.or.jp>. BUGS
SATA Native Command Queuing is not yet supported. Device hot swapping is not yet supported. ATAPI is not yet tested. Marvell's Software RAID is not yet supported by the ataraid(4) driver. raid(4) can be used instead. BSD
July 19, 2009 BSD
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