Re: [Pan-users] pan 0.14.2 - Freezing

[Jeff Vian]

Budman wrote:

> Hi,
>
> I recently did some shifting of drives on different controllers.  It appears
> I had some heavy I/O issues.  A controller was acting up and stopped 
> responding today.
>
> I have since installed a replacement, which I then separated all my IDE
> devices onto separate controllers.  I ran some tests, and I no longer get
> the system freezes.   It appears I have 3 different UDMA modes that were
> causing the problems.  33/66/100 and a cdrom.  
>  
For future reference

On ANY IDE controller, the entire bus runs at the speed of the slowest 
device. The IDE controller is not capable of running 2 different speed 
on the same cable.

Thus, if you have a CDROM on the cable, all devices on that cable will 
run at 33.

Similarly, if you have a drive that runs at 33 or 66 and another that 
will run at 133, if both are on the same cable, BOTH will run at the 
speed of the slower one.

> Now the drives are smoking and faster responding.  I think the one drive 
> was only getting 6MB/s now it is getting 28MB/s!!  :)  Same with the other
> drive was only getting about 12MB/s and now its 30MB/s!!! So I think I solved
> the problem.
Yep, 33 is about 1/3 of the speed of 100, so the gain of 3/1 is to be 
expected.