Hi, I was wondering if anyone knows what the story is with how redhat decides what default hard disk settings (i.e. hdparm settings for DMA, 32 bit IO, unmaskirq etc) to use on a new install? I've done several installs, and on some of them I've seen it default to all features turned on, other times, all features off. Does redhat installer have a blacklist, or a whitelist of drive/controller combo's on which it will enable certain features? Or are these variations bugs? On the systems where everything is turned off by default, I've manually enabled DMA and 32bit, but the man page entry for unmaskirq scares me a bit. Does anyone know of any resource for determining the safety of various settings for various drives/controllers?
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