RE: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard)

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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


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