Promise FastTrak 100 onboard ATA RAID controller
jason at tommyk.com
Wed Jul 2 08:45:52 PDT 2003
Alexander E. Patrakov wrote:
> Variant 1: Don't use it at all. Use "md" software RAID on main IDE interfaces
> (they are ATA133, but there is also a not-so-often-used CD-RW attached to one
> of them), as we do now.
If the hardware raid works, no way I would even consider a software raid.
> Variant 2: Move the disks to the Promise controller (ATA100, but no CD-RW),
> use the same "md" software RAID.
2 striped disks would have trouble overwhelming a 100MB/s interface, let
alone a 133 MB/s one. Since you're (smartly) doing mirroring there is
no gain at all to having a 133 bus instead of 100. I would put the
CD/RW seperately from the disk bus('s) in any case, that is important.
> Variant 3: Move the disks to the Promise controller and use the pdcraid driver
> (it has version 0.03 beta, I am not sure that it is stable enough).
Nothing to do by try it out... This would be the recomended setup if
the driver works.
> Another couple of questions: How do I know if one of the mirrored hard drives
> fail, for each variant? Can I replace a disk with a disk of higher volume in
> the case of failure?
Can't speak for the sw raid but for hw raid it depends on the
driver/controler. Even in the scsi raid arena there are cheap
controlers that can not do capacity expansion. You can usualy always
substitute a larger drive, but in many cases the extra capacity won't be
used. It's also generaly a bad practice to mirror 2 different
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