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Home -> Community -> Mailing Lists -> Oracle-L -> RE: hard disk configuration question
Steve,
You'll have to do the math, and that's still not a complete answer.
By 'math' I mean figure out the maximum throughput of their configuration version the one you really want.
Also keep in mind that 5 36 gig disks means RAID 5. Being somewhat familiar with that app, I feel fairly confidant in saying that's probably not a good choice, at least not on one volume like they are proposing.
On several volumes, you could get away with it, but one is pretty dicey. That app is pretty write intenisive and there's a 400% or so write penalty on RAID 5.
The sales critter will of course tell you that the cache will take care of it. Been through that with IBM on the Shark: after doing the math it became clear that the only possible way they could meet their throughput claim was with 100% cache hit ratio.
Just my $0.02 worth.
By the way, why not stick with Clariion? It will work with other Vendors besides DG.
Jared
-----Original Message-----
Sent: Tuesday, December 18, 2001 1:00 PM To: Multiple recipients of list ORACLE-L
We are in the process of buying new hardware, and our original
configuration
called for 10 18 GB drives in a Hitachi disk array cabinet. We are getting
some sales pressure to change this to 5 36 GB disks. Now I was planning to
spread our DB out over as many mirrored pairs as possible, or maybe even
including one RAID1+0 array. The sales folks at Hitachi are telling us
that
with their new drive array technology, spreading our Data files over as
many
disks as possible is not necessary. I am supposed to talk to one of their
engineers in an hour or so.
I am just wondering if there really is some magic bullet technology I have missed out on, or is there sales guy full of hooey?
They are also pushing the presence of two internal(not in the drive
cabinet)
drives as alleviating any space concerns. I am wondering what I can use
those drives for. I don't think I want to software mirror them, but maybe
Sun does this better than I think. Without some kind of redundancy I am
reluctant to use these disks for any DB purposes. Any thoughts here are
appreciated as well.
Thanks,
Steve McClure
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: Steve McClure
INET: smcclure_at_usscript.com
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author:
INET: Jared.Still_at_radisys.com
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