Originally Posted by mealto
I am still learning WHM on our VPS. Noticed something called "Optimize EIDE hard drives" with this warning: Warning: Optimizing drives may cause the system to lock up, or other wise crash in some way if you are using some older buggy chipsets. However you can gain SIGNIFICANT speed and performance. Proceed at your own risk.
Has anyone run this? If so, did you see any significant benefits?
I'm guessing it is referring to turning on all the modern options (DMA mode, blocks/read and read-ahead tweaks, 32-bit transfers) if they aren't already on.
The dangerous part is that some combinations of drives and controllers (especially when you have two drives on the same cable) don't work well together with some combinations of these options. The chance of a problem is very very small, but if a problem does happen it can result in serious file-system corruption hence the warning.
On a VPS it'll make no odds anyway - the host kernel controls such settings for the physical hardware and your VPS won't be able to affect them. Chances are that your VPS provider has the disc settings optimised as much as is safe anyway (and in fact is probably running off a SCSI or SATA RAID solution where the EIDE options aren't relevant anyway).