From: news [mailto:news@stripped]On Behalf Of Jon Drukman
Sent: Thursday, August 21, 2003 9:24 PM
Subject: Re: RAID or not?
Lefevre, Steven wrote:
> I say go with RAID 5, on a controller card.
> Mirroring just gives you backup, and you lose half your diskspace. It
> no performance benefit, and actually the computer might have to work
> to make sure the drives are in sync.
"that is not true. mirroring gives you double the read speed and half
the write speed. RAID5 gives you less than half the write speed."
OK, I see how it can give you double the read speed, but how can it give you
have the write speed? Does it split the data between disks and then sync
"that's why i said if your database app is mostly selects go for
mirroring. the OP said his app is about 50% select, so i say mirroring
is a good choice.
and hey, what's wrong with having a backup? the computer doesn't work
any harder, it's all handled through the RAID controller card anyway."
Of course, there's nothing wrong with having a backup, in fact he should.
But I was under the mistaken impression that that was all disk mirroing did