|
|||||||
| Forums | Search Forums | Register | Forum Rules | Man Pages | Albums | FAQ | Members | Calendar | Search | Today's Posts | Mark Forums Read |
| UNIX for Dummies Questions & Answers If you're not sure where to post a UNIX or Linux question, post it here. All UNIX and Linux newbies welcome !! |
|
|
|
Thread Tools | Search this Thread | Display Modes |
|
#1
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? |
| Sponsored Links | ||
|
|
#2
10-04-2012
|
|||
|
|||
|
Code:
sudo hdparm -I /dev/sda | grep -i speed where /dev/sda : Hard disk device file |
| Sponsored Links | ||
|
|
#3
10-04-2012
|
|||
|
|||
|
That command will just tell me that these speeds are supported.
I ran the read/write tests to see what speed it is actually operating at. I want to know if these speeds are acceptable for a 6.0gbps drive? |
|
#4
10-05-2012
|
|||
|
|||
|
The maximum transfer rate of SATA 2 is, ideally, around 300 megabytes per second. You're beating that by 30% in the real world so it really does look like you're getting SATA 3 speeds.
Just because a drive uses a SATA 3 port doesn't mean it's capable of its full 600 megabytes per second, of course. Whether you're reaching the true maximum speed of your drive, I can't say without knowing what it is and looking in its manual. The limits of your southbridge and memory are also important. Last edited by Corona688; 10-05-2012 at 12:22 PM.. |
| Sponsored Links | ||
|
|
| Thread Tools | Search this Thread |
| Display Modes | |
More UNIX and Linux Forum Topics You Might Find Helpful
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Disk read and write speed. | pinga123 | Filesystems, Disks and Memory | 5 | 08-17-2010 06:05 PM |
| data from blktrace: read speed V.S. write speed | W.C.C | Filesystems, Disks and Memory | 1 | 10-26-2009 09:42 AM |
| AIX - Determining link speed | karlgo | AIX | 3 | 08-02-2005 02:52 AM |
| determining ethernet port speed in solaris | xyyz | UNIX for Advanced & Expert Users | 7 | 11-12-2003 01:11 AM |
|
|
Linear Mode
