LinuxQuestions.org - SATA performance problem

Quote:

Originally Posted by niklas78 (Post 3024337)

Hello HappyTux,

sudo hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 1746 MB in 2.00 seconds = 873.15 MB/sec
Timing buffered disk reads: 232 MB in 3.03 seconds = 76.61 MB/sec
nwaren@amanda:~$ sudo hdparm -tT /dev/sdb

/dev/sdb:
Timing cached reads: 1248 MB in 2.00 seconds = 624.23 MB/sec
Timing buffered disk reads: 162 MB in 3.03 seconds = 53.55 MB/sec

If I understand your comments above correct, this might be "normal"?

Thanks for the benchmark figures -- they helped me figure whether my new eSATA external box was performing OK.

2 new 1Tb Seagate Barracuda's SATA-2 drives attached directly to a brand new motherboard:

root@brisbane:/var/log# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 7354 MB in 2.00 seconds = 3679.77 MB/sec
Timing buffered disk reads: 296 MB in 3.04 seconds = 97.46 MB/sec

Using hardware RAID-1 (which has its own penalties) in the external eSATA box:

/dev/sda:
Timing cached reads: 608 MB in 2.00 seconds = 304.03 MB/sec
Timing buffered disk reads: 154 MB in 3.00 seconds = 51.27 MB/sec

The cache is shot to pieces; and read speed is nearly halved. I am considering just building them in ;-)