Re: RAID question
From: Wolf (wolfdotcom_at_hotmail.com)
Date: 11/23/04
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Date: Tue, 23 Nov 2004 22:31:30 GMT
"Peter Cattaneo" <pkcattan@syr.edu> wrote in message
news:41a356b6$0$122$143e8eca@news.syr.edu...
> I'm getting ready to build a PC for an Oil and Gas Application.
>
> I want to use RAID this time around, but need some advice.
>
> I understand what RAID is, but can't find any info on how raid level
> affects the total usable disk space.
>
> For instance. I know that RAID 1 is mirroring. If I have two 120gb
> drives, I only have 120gb of usable space. How does this with with all
> the other RAID levels? Does someone have a chart that explains this?
>
> The system we are thinking of is a RAID 5 with three (3) 146gb drives.
> How much usable space will I have? If I add a forth 146gb drive, how
> much will I have.
There have been some good technical responses so I will just give my
2 cents. My rule of thumb is RAID5 with a spare disk. Subract the spare,
subract one more for the eqiv of the parity drive. multiply the rest of the
space by .9 or so an you have a "close enough" file system size.
-- Wolf ---------------------------------------------------------------- Please post all responses to UseNet. All email cheerfully and automagically routed to Dave Null
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