Re: [ldm-users] Fedora 7 redux: BUSTED!


I run CentOS 4.5 with SATAII drives in  hardware raid arrays with no issues.
For production machines I would highly recommend running CentOS (RHEL4/5)
it's stable and mature. If you want to play with Fedora, then install VMware
and run Fedora in a guest session. 

That's my thoughts.  Also I have found running the ldm queue in a ramdisk
really lowers the disk I/O significantly. With low prices of ram, create
1-2GB ram disk for the ldm queue is affordable and you will notice the I/O
wait go down on LDM systems receving/passing data...such as a dedicated

-----Original Message-----
From: ldm-users-bounces@xxxxxxxxxxxxxxxx
[mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Gilbert Sebenste
Sent: Thursday, October 11, 2007 5:45 PM
To: ldm-users@xxxxxxxxxxxxxxxx
Subject: Re: [ldm-users] Fedora 7 redux: BUSTED!

On Wed, 10 Oct 2007, Gilbert Sebenste wrote:

> Hello all,
> I am not ready to call stable. But a "gotcha" is
> noting for all:
> My hard drive on is a Seagate 750 GB, 3 GB/s at 7200

> RPM. It uses something called SATA 2 to achieve the 3 GB/s
> throughput. After talking to a system administrator locally, a kernel 
> maintainer from Redhat, and doing research on the Web, there are still 
> problems with SATA 2...which can result in the drive crashing. In fact, I 
> learned that even DVR's that have their drives swapped out with ones that
> the SATA 2 protocol have this very same problem. And a local sysadmin I
> fried a few hard drives using it a 3 GB...on a Windows XP machine with a 
> hardware RAID because it didn't like it.
> The solution...the one recommended by RedHat...the guys with the DVR 
> problem...and others was to put a jumper on it so that it only uses SATA
> or 1.5 GB speed. That I did a few days ago, and no crashes, yet. When I
> booted up this machine with the new drive at 3 GB/s, it took 5 days before
> crashed. I'll wait a few weeks before I call this cured, if in fact it is.
> also slapped on a new kernel tonight (2.6.23), which seems to be working 
> fine.

Well, I just got a new hard drive for our new 
machine, which U had online but took off because of the same problem. When 
I got the new one...SURPRISE!...a jumper had been put on by somebody, 
probably at the company I ordered them from, to have it only use SATA 1. 
Box was opened, too. Busted! Looks like I wasn't the only one experiencing 
this problem. Of course, that doesn't explain if the problem is at hard 
drive firmware level, or OS level. Either way...

My machine used to crash after 4-12 hours. I rebooted it last night for 
the kernel upgrade, but it was up 2 of the longer periods it 
was up before the first time I loaded it on there.

So, we'll see how it goes. But for's working.

Gilbert Sebenste
(My opinions only!)                                                  ******
Staff Meteorologist, Northern Illinois University                      ****
E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx                                  ***
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