RAID does not cause bad data! Bad data can get on any disk, even if it is part of a RAID system. The bad data does not come from the hard disk, CRCs prevent that. The problem is: Where does the bad data come from? Bad memory? No, everyone use ECC memory, right? Guy -----Original Message----- From: Alvin Oga [mailto:aoga@xxxxxxxxxxxxxxxxxxxxxxx] Sent: Wednesday, January 05, 2005 10:34 AM To: Guy Cc: linux-raid@xxxxxxxxxxxxxxx Subject: RE: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard) On Wed, 5 Jan 2005, Guy wrote: > I agree, but for a different reason. Your reason is new to me. .. > Loosing the swap disk would kill the system. if one is using swap space ... i'd add more memory .. before i'd use raid - swap is too slow and as you folks point out, it could die due to (unlikely) bad disk sectors in swap area > I don't want a down system due to a single disk failure. that's what raid's for :-) > I mirror everything, or RAID5. Normally, no downtime due to disk failures. the problem with mirror ( raid1 ).. or raid5 ... - if you have a bad diska ... all "bad data" will/could also get copied to the good disk - "bad data" is hard to figure out in code ... to prevent it from getting copied ... how does it know with 100% certainty - if you know why it's bad data, it's lot easier to know which data is more correct than the bad one - as everybody has pointed out .. bad data ( disk errors ) can occur for any number of gazillion reasons have fun raiding alvin - 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
