Date: Thu, 20 Mar 2003 13:13:18 +0100 From: Alexander Haderer <alexander.haderer@charite.de> To: Maarten de Vries <mdv@unsavoury.net>, Dirk-Willem van Gulik <dirkx@webweaving.org> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Three Terabyte Message-ID: <5.2.0.9.1.20030320125711.019eb9c8@postamt1.charite.de> In-Reply-To: <20030320125035.Y84859@manhattan.unsavoury.net> References: <20030320111436.N74106-100000@foem.leiden.webweaving.org> <20030320111436.N74106-100000@foem.leiden.webweaving.org>
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At 12:53 20.03.2003 +0100, Maarten de Vries wrote:
>On Thu, 20 Mar 2003, Dirk-Willem van Gulik wrote:
>
> > Depends on what access patterns you have; is it mostly dormant
> > archiving; or lots of access, concurrent, sequential ? How safe does the
> > data need to be; and against what (hardware failure, accidental rm -rf).
>
>This would be for backup. Data on about 50 webservers would be backed up
>to it on a nightly basis. So performance wouldn't be important.
Sure? Consider this:
a.
Filling 3TB with 1 Mbyte/s lasts more than 800 hours or 33 days.
b.
Using ssh + dump/cpio/tar needs CPU power for encryption, especially when
multiple clients safe their data at the same time.
c.
When using FreeBSD 4.X a fsck after a hard reboot will block the server.
fsck'ing a full 3TB filesystem may need a long time. Its better to use
several smaller file systems.
d.
Wrong parameters for newfs may slowdown large filesystems and waste lots of
space. Before using large filesystems read the manpage of newfs, especially
the topics about options -b -f -i
with best regards,
Alexander
--
Alexander Haderer Charite Berlin - Germany
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