You need to go to RAID school! :) No problem, so did everyone else at one time. RAID0 does not create a backup copy of your data. It just uses 2 or more disks, giving you 2 or more times the space of a single disk. If any 1 disk were to fail in a RAID0 array, your data would be virtually gone. RAID0 tends to also improve read and write performance. RAID1 makes copies of your data on each disk. Normally 2 disks are used, both would have a full copy of your data. The usable space would be the same as a single disk regardless of the number of disks used. But each would have a full copy. RAID1 tends to also improve read performance in a multi tasking environment. But write performance stays about the same, unless you have a data bottleneck somewhere. With RAID0, mounting a single disk is useless. Don't waste your time. With RAID1, you should not attempt to mount a disk directly, unless you are recovering from an abnormal failure. Doing so could cause your array to be out of sync, and md would not know it has occurred. A normal failure would allow you to have normal access to your data, just using 1 less disk, without user intervention. I hope this helps! Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Poonam Dalya Sent: Wednesday, January 19, 2005 2:52 PM To: linux-raid@xxxxxxxxxxxxxxx Subject: Checking if RAID does work? Respected Sir, Sir, I would like to check if my data is actually being written on the RAID disks of RAID0 array. I tried to check by doing the following steps... I mounted my /dev/md1 on /mnt/raid. and then wrote a file on it. Then I tried to mount the raid disks /dev/hda10 on some other mount point and checked that mount point. But there was nothing in that mount point. Please could you please help me with this. Sir I tried the same steps with a RAID1 array and showed the files which I wrote on the md mount point. Hoping for your reply.Thanking you in anticipation. Regards, Poonam __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
