Date: Mon, 10 Jul 2000 14:21:03 +0930 From: Greg Lehey <grog@lemis.com> To: ian j hart <ianjhart@freeloader.freeserve.co.uk> Cc: questions@FreeBSD.ORG Subject: Re: partition sizes vinum and ccd Message-ID: <20000710142103.C18656@wantadilla.lemis.com> In-Reply-To: <39691175.1B657EC2@freeloader.freeserve.co.uk> References: <39691175.1B657EC2@freeloader.freeserve.co.uk>
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On Monday, 10 July 2000 at 0:57:41 +0100, ian j hart wrote:
> Hello all.
>
> Background: I am the technician at a school in the UK. I have to provide
> web browsing and email services before the start of the next academic
> year. I figured I'd break it down into two parts. Build a local server.
> Test during the first term while I build a firewall. Cross fingers and
> hope it works.
>
> Hardware: This is what I have to work with. No discussion required here,
> the budget is spent.
>
> AMD K6II-500
> 2x 18Gb SCSI hard disks
> 256Mb RAM.
> SCSI CDRW
> Some other stuff...
>
> Software: (suggestions?)
> Apache
> imap-uw (if fixed) or qpopper?
> fetchmail or SMTP forward on the firewall
>
> What I need to know is how best to partition the disks. I have no
> idea how big the partitions need to be as there is no existing
> server. Load will be maximum 150 Win95 clients, 1500 users. What
> combination of vinum,ccd and swap will give me best
> safety/performance? I've not used vinum before but as it's a new
> machine I can always format and use *normal* partitions if it fries
> my brain. The machine will double as cvs repository/buildserver off
> peak. I recon that's 7Gb /usr plus 1Gb if I build release. The CDRW
> will need chunks of 650Mb for spooling file server(NT) backups. Then
> web space and mail for each user.
>
> I hope someone can help. Even a df from a similar system would be
> better than nothing.
What kind of tapes are you using for backup? It's best to ensure that
a file system backup pretty well fills up a tape, but doesn't ever
require more than one tape. If you have, say, a DDS-4 or DLT drive,
you can back up the whole system on one tape.
Apart from that consideration, make the file systems as large as
possible. Use quotas to ensure that people don't overstep their mark.
Vinum vs. ccd: You only need one. Vinum has more functionality and
better failure recovery, so that's the one you should stick with.
Since you're after safety (which I assume includes tolerance of disk
failure), you should use volumes with two plexes. You'll get
marginally better results from striped plexes, so your Vinum config
would look like:
drive 1 device /dev/da0h
drive 2 device /dev/da1h
volume everything
plex org striped 275k
sd len 17g drive 1
plex org striped 275k
sd len 17g drive 2
Greg
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