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Re: advice: 3ware+raid+xfs

To: Seth Mos <knuffie@xxxxxxxxx>
Subject: Re: advice: 3ware+raid+xfs
From: Gaspar Bakos <gbakos@xxxxxxxxxxxxxxx>
Date: Tue, 9 Dec 2003 12:27:39 -0500 (EST)
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <>
References: <>
Reply-to: gbakos@xxxxxxxxxxxxxxx
Sender: linux-xfs-bounce@xxxxxxxxxxx

> >It would be a dual xeon mobo + 3ware Escalade card + 4x250Gb (WD) disk,
> Good choice. I assume you mean the 4 port card.

Yes, it is the 4-port one. Maybe, once upon a time when I get more funded,
I will get 8-port card(s).

> I would suggest using Raid 10 ( size = n/2) if you have have a enviroment
> with heavy writes. If you won't write to the fs too much and it's mostly
> reads you could use raid 5 (size = n-1).

The read/write is approx equal, maybe 'read' a little bit more. (I wonder,
in long-term, how could I 'measure' this).

> If it's a production server I tend to waste money and opt for the raid 10
> option instead since it's so much faster for database workloads and write

It is a data-cruncher. Reads in 8-16Mb astronomical images, measures
5Bsources, writes out few Mb output, and several small files (logs).

Thanks for all the advice on RAID-5 vs. RAID-10!

> If it's 60TB I don't think it's a single filesytem under linux. The current
> limit is 2TB per device. AFAIK this is fixed in the upcoming 2.6
Great... time will come soon when I hve to migrate.


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