In a message dated: Wed, 23 Feb 2000 19:40:30 EST
Marc Evans said:
>Since you are talking more about data replication and inexpensive
>mirroring, maybe your should consider using rsync (http://www.rsync.org).
>I personally believe that the price of a hardware RAID is worth every
>penny in cnotrast to software solutions, and I rarely ever configure
>anything less then RAID-5. Those are personal preferences though...
There is often little reason to configure anything other than RAID 5. RAID 5
is really an inexpensive manor of mirroring. There are definitely times
though, when you would want to use RAID 0, RAID 1, or RAID 0+1 (or 1+0),
though in most cases, if you need this type of technology, then you're going
to also have the money to throw at the problem.
A classic example of when you'd want 0+1 or 1+0 is in a transaction-based
system like ClearCase, or anything with heavy database access. In these
cases, sw RAID will be such a HUGE performance bottleneck you shouldn't waste
your time, and RAID 5 will also be a drain on the system.
I don't know exactly what you're doing, but you can get used Mylex RAID cards
for a few hundred dollars. If you want to be *really* cheap, you can do
something like use 'dd' to mirror the drives once a day or something, or like
Marc suggested, use rsync to mirror to another cheap machine. rdist is also
another option that will offer similar options (I think rsync is slightly
different, and may be a newer/better rdist, but I'm not sure).
Hope that helps.
--
Seeya,
Paul
----
Doing something stupid always costs less (up front) than doing
something intelligent.
Bean counters are *always* wrong!
A conclusion is simply the place where you got tired of thinking.
If you're not having fun, you're not doing it right!
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