On Mon, Apr 25, 2011 at 3:38 PM, Istvan Gabor
2011. április 25. 20:48 napon John Andersen
írta: On 4/24/2011 3:59 PM, Istvan Gabor wrote:
Well, all the drives with all their partitions are recognized by both knoppix and opensuse. Eg looking at /dev/disks/by-id directory.
The problem is that the raid set is not detected in openSUSE. The two drives which has the raid set is visible, and I can mount them. (I mount them only as read-only filesystems as I do not want to make any change and ruin the raid array)
Ok, but just to be clear, you've moved past the point of expecting dmraid of finding these devices, correct?
If you mean that I don't expect openSUSE to detect the raid array, the answer is no. I only posted the above info since it was asked whether the devices are accesible as non-raid, regular devices.
dmraid is only for software raid. You have hardware raid.
Yes, dmraid is software raid. The SiI 3512 is a softraid/fakeraid controller. It can set up raid arrays and can rebuild raid arrays on its own, but the operation systems has the task to detect the two disks as an array and handle it as an array.
Istvan
I am not a fakeraid expert, but I'm pretty sure Istvan's descriptions have been accurate. As a raid guy, I thought I'd at least provide this info: === I'd suggest both the terms software raid and hardware raid be dropped in this thread going forward. The experts / docs / etc. treat fakeraid as its own thing and not a subset of either hardware or software raid. In general fakeraid is discouraged for linux because: Pro's: interoperable with windows in a dual boot scenario Con's: lack of well tested linux drivers. Simply put, not many linux users use fakeraid. Neutral: fakeraid has the same CPU requirements as software raid Neutral: some fakeraid controllers expose a XOR engine that can be used to some of the raid5/raid6 calculation work. MDraid has some options to leverage those XOR engines from the kernel. I don't know if linux DMraid can do that as well or not. Workaround - reconfigure drives as discrete drives and let linux MD raid software take it from there. Issue with workaround - it requires a full backup / restore because all data is lost. As to the linux-raid mailinglist, that is exclusively for MDraid I'm almost positive, so its not much of a resource for fakeraid. I don't know where to take a fakeraid problem to. (I don't do fakeraid.) Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org