Archive for December, 2008
If you buy a RAID Adapter often you’ll have to create a driver disk for your OS. Most of these are 1.44MB floppy images and since modern systems often lack a floppy drive I needed some way of creating the disk.
I used a USB stick and dd for Windows (I’m sure dd for Linux would work just as well)
From the Windows Comand Prompt:
C:\>dd if=mini.img od=x
: (Where X is the drive letter of the USB stick)
Then just insert the USB stick before loading your Linux Installation Media.
A very quick way to benchmark your disk performance is hdparm -t /dev/Xda (hda or sda):
you should get results like this:
root@esx-mars root]# hdparm -t /dev/sda
Timing buffered disk reads: 358 MB in 3.00 seconds = 119.33 MB/sec
This is from a Dell PowerEdge 2900 with the PERC 5i SATA RAID Controller.
Roughly you want to see 50 MB+ per disk, if you have a RAID 0 of two disks you should get 100 MB+.
What numbers are your getting?5 comments
I used to use mv in a for loop or with exec, or xargs until I found a very useful command that’s included in almost every distro
$ rename oldfilename newfilename *filepattern
To rename all the files in the current directory ending with .htm to .html
$ rename .htm .html *.htm
You can use RegEx and for more sophisticated selections and use
-n to test your changes before you commit them.