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I'm having trouble with my SSD, it's running pretty slow. 


[root@cowp ~]# hdparm  -t /dev/hda

/dev/hda:
Timing buffered disk reads: 10 MB in  3.43 seconds =   2.91 MB/sec
[root@cowp ~]#
Blah .. you are kidding me right? My other 500g normal drive runs at 125MB/s (40 times faster). I did some investigating and it seems that it's using the ide driver rather than the sata one.

So the solution is to add ide0=noprobe and ide1=noprobe into the kernel settings. 

#boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,1)/grub/ft-splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.10.1.el5PAE) no probe
        root (hd0,1)
        kernel /vmlinuz-2.6.18-164.10.1.el5PAE ro root=LABEL=/ rhgb quiet ide0=noprobe ide1=noprobe
        initrd /initrd-2.6.18-164.10.1.el5PAE.img
t
and now we get much better result: 
[root@cowp ~]# hdparm  -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  500 MB in  3.00 seconds = 166.63 MB/sec
[root@cowp ~]#
And you can also see that the device changed. It was /dev/hda, and now it's /dev/sdb. So keep that in mind if you reference the device directly (eg in /etc/fstab)

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Last Change: Monday, 11-Jan-2010 02:34:58 EST

Disclaimer

The information provided within these pages is provided AS IS, and without any warranty. Following these directions may (but not limited to) crash your computer, delete all the information on your hard disk, open up security holes or cause your house to burn down. I made these pages to provide some information about the setup that I have done, but I did not proofread it for correctness, and in most cases did not test it. There are commands in these pages that would definately delete or corrupt all the data on your computer (especially the dualboot section). In fact it happened to me.... So you are on your own!

Cameron Gregory