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Re: Mixing ataraid and software raid



Hi

ataraid and md raid cannot mixed because in case of unsynchronized data,
ataraid (and also promise raid) will fail. However, if you take great
care, you can use ataraid for some partitions and md raid for other
partitions. Make sure that any programs running on md raid partition DO
NOT call /dev/hdeN but instead /dev/ataraid/d0pN

I recommend using atleast /boot and / for ataraid if you choose to Mix
ataraid and md raid.

It is important  not to access disk partitions by their direct names (eg
/dev/hdeN) ALSO not access by the disk labels when the partition
participates in ataraid

Because /boot (/ if you dont have /boot) must be either non-raid partition
or raid 1, if you decide to use software raid, you can use ataraid for
/boot or /. I didnt test it but ataraid (raid 0 or raid 1) on boot
partition will work


On Sat, 18 Jan 2003, Marcin wrote:

> Hi,
> I've got Gigabyte GA-7ZXR motherboard with Promise 20265 FastTrack  Lite raid 
> controller.  After disk failure, I've decided to setup raid 1, bought two 
> Seagate Barracuda IV 40 GB drivers, and configure them with Promise Bios 
> utility. I created 4 Linux and one WinXP Pro NTFS (still waiting for 
> SuperMemo for Linux...) partitions. I restored Linux from backup, changed 
> /dev/hdaX to /dev/ataraid/d0pX in /etc/fstab, modified lilo.conf, and 
> everything run fine. Than I turned off power, disconnected one drive (to 
> simulate drive failure) and ... "oops" during loading ataraid appeared 
> (2.4.19 from Debian). The same oops shows in 2.4.20-ac2.
> 
> Strongly disappointed, I came to the following question: is it possible (and 
> safe, of course) to use software raid-1 (which I succesfully run on several 
> others computers) for Linux, making /dev/hdeX and /dev/hdgX parts of the 
> software raid array, and simulaneously take advantage of Promise feature in 
> WinXP using FastTrack drivers array?
> 
> Thanks in advance,
> 





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