Thanks for the info: A follow up to my question about a drive failing in an array. When using ATARAID in a RAID1 array, what is suppose to happen when 1 drives dies? You said that it is suppose to continue to run on the one remaining drive, but I am curious as I have tried to replicate that scenario. When I replicate a failed drive in RAID 1 array, I get errors on the screen but the machine stays running. The only thing is, is that you can't shut the machine down properly. If you try to run shutdown -h now, it gives you an Input/Output error. Has anyone experienced an actual drive failure in a RAID 1 array? I have also tried to reboot using just one drive in a failed array, and the kernel panics. I have no problem with having to rebuild failed arrays manually, but I want to make sure that if one drive does fail that I will be able to shutdown properly, so that I can replace and rebuild successfully. Does anyone know how to replicate such a scenario so that I am sure that everything is set up and working probably? Thanks. Gary Shadley -----Original Message----- From: ataraid-list-admin@xxxxxxxxxx [mailto:ataraid-list-admin@xxxxxxxxxx] On Behalf Of Thorsten Jungblut Sent: Thursday, November 21, 2002 5:01 PM To: ataraid-list@xxxxxxxxxx Subject: Re: What is ATARAID and how does it work? On Thu, 21 Nov 2002, Gary Shadley wrote: > Then I would assume that ataraid is working correctly with my Promise > Fastrak 100 lite controller. Looks like that, yes. > What happens suppose to happen if one of > your disks fails in your mirrored array? Does ataraid automatically > rebuild the failed drive? This depends on what you mean by "fail". If one drive fails, a raid1 will continue working as another drive is present. If it is a raid0 it will immedialy stop working.. If raid1 and you connect a new drive, you will have to manually rebuild the array. > Does ataraid make sure that the drives are in > sync? No it does not. You can use just one drive, change it contents and then use the array again and it will not detect differences. This was discussed on this list earlier. > Any help clarifying how ataraid actually works and what it suppose to > do would be a great help The only thing ataraid actually does is "making things usable". This means, you can use a raid array with linux, but not more. You will have to manage the array manually, e.g. with the controllers setup. ataraid is a software raid. The controller is a usual ide controller, just with a bios, that manages the disks as a raid array, and so does the linux driver. If you want to use a raid1 array, you should think of linux's software raid (md) instead of ataraid. Linux's software raid is able to detect failures and out-of-syncs. If you want to use raid0, it doesnt matter, as if one drive failes, the raid0 array will be lost, no matter if it is a software raid or ataraid or even a hardware raid. Viele Grüsse, Thorsten -- Thorsten Jungblut Universität Koblenz, Fachbereich Informatik http://www.netcorner.org/ _______________________________________________ Ataraid-list@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/ataraid-list
