scsi速度有多少

biosedit

Ultra 320 SCSI有320MB/s的速度吗？这里的320MB/s是整根硬盘线能达到的速度，还是单个硬盘达到的速度?

用4块Seagate 146的scsi盘，MegaRAID SCSI 320-1 RAID卡做的RAID-5，用SANergy测试为什么速度只有7MB/s，

在另外一台39320A 卡的机子上测了一下单块scsi盘的速度有也才20MB/s,可在自己的电脑上
迈拓的IDE硬盘开启DMA的情况下却有50MB/s的速度，
ide比scsi快?
非raid比raid快?

晨想

感觉 megaraid 速度很慢，不过也许是我不会调。

至于速度，我用linux的内核 raid，速度还是很快的，不知道是不是卡本身的问题。

wheel

SATA2---
[root@pt ~]# hdparm -tT  /dev/sda

/dev/sda:
Timing cached reads:   3772 MB in  2.00 seconds = 1885.29 MB/sec
Timing buffered disk reads:  182 MB in  3.02 seconds =  60.22 MB/sec
[root@pt ~]# smartctl -i  /dev/sda
smartctl version 5.37 [x86_64-unknown-linux-gnu] Copyright (C) 2002-6 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF INFORMATION SECTION ===
Model Family:     SAMSUNG SpinPoint P120 series
Device Model:     SAMSUNG SP2004C
Serial Number:    S07GJ1MYA09510
Firmware Version: VM100-50
User Capacity:    200,049,647,616 bytes
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   7
ATA Standard is:  ATA/ATAPI-7 T13 1532D revision 4a
Local Time is:    Mon May 21 20:47:59 2007 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
___________________________________________________________
smartctl -i  /dev/sda
smartctl version 5.33 [x86_64-redhat-linux-gnu] Copyright (C) 2002-4 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

Device: FUJITSU  MAW3073NP        Version: 0104
Serial number: DAS0P6100ET3
Device type: disk
Transport protocol: Parallel SCSI (SPI-4)
Local Time is: Mon May 21 21:04:40 2007 CST
Device supports SMART and is Enabled
Temperature Warning Enabled

SCSI
[chenqs@localhost ~]$ hdparm -tT /dev/sda

/dev/sda:
Timing cached reads:   2628 MB in  2.00 seconds = 1313.54 MB/sec
Timing buffered disk reads:  254 MB in  3.00 seconds =  84.57 MB/sec